To determine the net electric charge of the purple plastic, we need to calculate the total charge based on the excess electrons it possesses.
The elementary charge is the charge of a single electron, which is approximately [tex]1.602 × 10^(-19) C[/tex].
Given that the purple plastic has [tex]7.75 × 10^6[/tex] extra electrons, we can calculate the net electric charge as follows:
Net electric charge = (Number of extra electrons) × (Elementary charge)
= ([tex]7.75 × 10^6[/tex] electrons) × ([tex]1.602 × 10^(-19)[/tex] C/electron)
Performing the multiplication, we find that the net electric charge of the purple plastic is approximately[tex]-1.242 × 10^(-12)[/tex] C. The negative sign indicates an excess of electrons.
Regarding the glittering glass globe, a net electric charge of [tex]5.21 × 10^(-6)[/tex]C suggests an excess of positive charge, as it is greater than zero. Therefore, the globe has fewer electrons in its neutral state.
The amount of electrons that are missing in the globe's neutral state can be calculated by dividing the net electric charge by the elementary charge:
Number of missing electrons = (Net electric charge) / (Elementary charge)
= [tex](5.21 × 10^(-6) C) / (1.602 × 10^(-19)[/tex] C/electron)
Performing the division, we find that the globe has approximately [tex]3.25 × 10^13[/tex] fewer electrons in its neutral state.
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Which of the following statements about black holes is not true? A black hole is truly a hole in spacetime, through which we could leave the observable universe. All objects inside the event horizon of a blackhole can never escape to reach infinity. But they may move radially away from the singularity for a certain finite distance before falling back towards it. If you watch someone else fall into a black hole, you will never see him or her cross the event horizon. However, he or she will fade from view as the light he or she emits (or reflects) becomes more and more redshifted. If you fell into a black hole, you would experience time to be running normally as you plunged rapidly across the event horizon.
The statement that is not true about black holes is: If you fell into a black hole, you would experience time to be running normally as you plunged rapidly across the event horizon.
According to our current understanding of black holes based on general relativity, if an object crosses the event horizon of a black hole, it is believed to be inevitably pulled towards the singularity at the center.
As an object approaches the singularity, the gravitational forces become extremely strong, leading to what is commonly referred to as spaghettification or tidal forces. These forces stretch and compress the object along its length, causing it to be torn apart.
In the context of the statement, if a person were to fall into a black hole, they would experience extreme gravitational forces and tidal stretching. From an observer's perspective outside the black hole, they would never see the person cross the event horizon.
As the person approaches the event horizon, the light they emit or reflect becomes more and more redshifted, eventually fading away. This redshifting of light is a consequence of the intense gravitational field near the black hole.
However, from the perspective of the person falling into the black hole, their experience would be quite different. The extreme gravitational effects near the event horizon would cause significant time dilation.
Time would appear to slow down for the falling person, and as they approach the event horizon, their perception of time would become increasingly distorted. Eventually, as they reach the singularity, their time and existence would cease according to our current understanding.
Therefore, the statement suggesting that time would run normally for a person falling into a black hole is not true based on our current scientific understanding.
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A circular loop of wire has an area of 0.27 m2 . It is tilted by 44 ∘ with respect to a uniform 0.35 T magnetic field. Part A What is the magnetic flux through the loop?
6.8×10^−2 T⋅m2T⋅m2
0.14 T⋅m2T⋅m2
0.37 T⋅m2T⋅m2
0.80 T⋅m2T⋅m2
1.5 T⋅m2
The magnetic-flux through the loop is approximately 0.1 T⋅m^2.
To calculate the magnetic flux through the loop, we can use the formula:
Φ = B * A * cos(θ)
Where:
Φ is the magnetic flux
B is the magnetic field strength
A is the area of the loop
θ is the angle between the magnetic-field and the normal to the loop
Given:
Area of the loop (A) = 0.27 m^2
Magnetic field strength (B) = 0.35 T
Angle (θ) = 44°
Plugging in the values into the formula:
Φ = (0.35 T) * (0.27 m^2) * cos(44°)
Calculating:
Φ ≈ 0.35 T * 0.27 m^2 * cos(44°)
Φ ≈ 0.0975 T⋅m^2
Rounded to one decimal place, the magnetic flux through the loop is approximately 0.1 T⋅m^2.
Therefore, the correct option is 0.1 T⋅m^2.
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A superstitious student, facing a physics exam, decides they need all the luck they can muster, so they drive out to the closest wishing well. Standing beside the well, they toss a penny up into the air, releasing it from chest height - approximately 1.31 m above ground level. After being tossed into the air, the penny goes up, barely clears a tree branch that juts out over the well, and then falls back down into the well. If the tree branch is 6.62 m above ground level, at what speed (in m/s ) was the penny tossed into the air?
The student threw a penny up in the air with an initial height of 1.31 m from the ground. The penny cleared a tree branch with height 6.62 m, after which it fell back into the well.Using the formula,
s = ut + 1/2 at²
where:s = total distance covered by the penny which is the height of the tree branch u = initial velocity of the penny at the point it was thrown up into the air t = time taken by the penny to reach the height of the tree brancha = acceleration due to gravity = 9.8 m/s² for the penny at the earth's surfaceAt the top of the well, the penny's velocity is zero.
Thus, using the formula
,v² = u² + 2as
Where:v = final velocity of the penny when it hit the tree branch = 0, because it just touched it and changed its direction. u = initial velocity of the penny, which is what we are solving for s = height of the tree branch - initial height of the penny = 6.62 - 1.31 = 5.31 mata = -9.8 m/s²,
as the penny was moving upwards.Taking the square root of both sides of the equation above, we get:
u = √(v² - 2as)u = √(0 - 2(-9.8)(5.31))u = √(104.964)u = 10.246 m/s
Therefore, the speed at which the penny was tossed into the air was 10.246 m/s, to 3 significant figures.
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A race car starts from rest and accelerates at 20.0 m/s2 for 5.0 s. It then moves with a uniform velocity for 60 s before it decelerates at 10.0 m/s2 until it comes to a stop. *Note: Show the complete solution by showing all of your work! (
a)Determine the velocity of the race car after 5.0 s.
(b)Determine the total distance traveled by the car between from the instant it started to move until it came to a stop.
(c)What was the total time that the car was in motion?
(a)The velocity of the race car after 5.0 s is 100.0 m/s. (b) The total distance traveled by the car from the instant it started to move until it came to a stop is 6250.0 m. (c) The total time that the car was in motion is 75.0 s.
Let's calculate the values step by step:
Given:
Acceleration during the first phase (a1) = 20.0 m/s²
Time during the first phase (t1) = 5.0 s
Uniform velocity phase (t2) = 60 s
Deceleration during the third phase (a3) = -10.0 m/s²
(a) To determine the velocity of the race car after 5.0 s, we can use the formula:
v = u + a × t
where:
v is the final velocity,
u is the initial velocity,
a is the acceleration,
t is the time.
Since the race car starts from rest, the initial velocity (u) is 0 m/s.
v = 0 + (20.0 m/s²) × (5.0 s)
v = 100.0 m/s
Therefore, the velocity of the race car after 5.0 s is 100.0 m/s.
(b) To determine the total distance traveled by the car, we need to calculate the distance covered during each phase and sum them up.
Distance during the first phase:
Using the equation of motion:
s1 = u × t1 + (1/2) × a1 × t1²
Since the initial velocity (u) is 0 m/s:
s1 = (1/2) × (20.0 m/s²) × (5.0 s)²
s1 = 250.0 m
Distance during the second phase:
Since the car moves with a uniform velocity, the distance covered is:
s2 = v × t2
s2 = 100.0 m/s × 60 s
s2 = 6000.0 m
Distance during the third phase:
Using the equation of motion:
s3 = v × t3 + (1/2) ×a3 × t3
Since the final velocity (v) is 0 m/s:
s3 = (1/2) × (-10.0 m/s²) × t3²
The time during the third phase (t3) can be found by equating the final velocity to 0:
v = u + a × t
0 = 100.0 m/s + (-10.0 m/s²) × t3
t3 = 10.0 s
Substituting the value of t3:
s3 = (1/2) × (-10.0 m/s²) × (10.0 s)²
s3 = -500.0 m
Total distance traveled by the car:
Total distance = s1 + s2 + s3
= 250.0 m + 6000.0 m + (-500.0 m)
= 6250.0 m
Therefore, the total distance traveled by the car from the instant it started to move until it came to a stop is 6250.0 m.
(c) To determine the total time that the car was in motion, we add the
time for each phase:
Total time = t1 + t2 + t3
= 5.0 s + 60 s + 10.0 s
= 75.0 s
Therefore, the total time that the car was in motion is 75.0 s.
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The large red L's on a surface map represent centers of low pressure, also known as ____ storms.
a. high-latitude anti-cyclonic
b. mid-latitude cyclonic
c. high-latitude cyclonic
d. mid-latitude anti-cyclonic
Answer:
The large red L's on a surface map represent centers of low pressure, also known as mid-latitude cyclonic storms.
Explanation:
These storms are characterized by rotating winds that move counterclockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere. The low pressure at the center of the storm causes air to rise, leading to cloud formation and precipitation. Mid-latitude cyclonic storms are also known as extratropical cyclones and are common in the middle latitudes (around 30-60 degrees) of both hemispheres.
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Only two forces act on an object (mass=3.19 kg). Find
(a) the magnitude and (b) the
direction (relative to the x axis) of the acceleration of
the object.
(a) The magnitude of the acceleration of the object is 9.81 m/s².
(b) The direction of the acceleration is vertically downward (opposite to the positive y-axis).
The magnitude of the acceleration can be calculated using Newton's second law of motion, which states that the net force acting on an object is equal to the mass of the object multiplied by its acceleration (F = ma). In this case, there are two forces acting on the object, so the net force can be found by summing up these forces.
Since we know the mass of the object (3.19 kg), we can calculate the net force. However, the question does not provide information about the forces acting on the object. Therefore, we cannot determine the net force or the acceleration directly.
However, if we assume that only two forces act on the object, we can deduce that the net force is the vector sum of these two forces. In the absence of any other information, we can consider the gravitational force (weight) as one of the forces acting on the object.
The weight of an object can be calculated by multiplying its mass by the acceleration due to gravity (9.81 m/s²). As the object is on Earth, the gravitational force acts vertically downward, opposite to the positive y-axis. Therefore, the direction of the acceleration is also vertically downward.
In summary, the magnitude of the acceleration is 9.81 m/s², and its direction is vertically downward (opposite to the positive y-axis).
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A transverse sinusoidal wave of wave vector k=8.02rad/m is traveling on a stretched string. The transverse speed of a particle on the string at x=0 is 45.8 m/s. What is the speed of the wave in m/s, when it displaces 2.0 cm from the mean position? Provided the displacement is 4.0 cm when the transverse velocity is zero.A transverse sinusoidal wave of wave vector k=8.02rad/m is traveling on a stretched string. The transverse speed of a particle on the string at x=0 is 45.8 m/s. What is the speed of the wave in m/s, when it displaces 2.0 cm from the mean position? Provided the displacement is 4.0 cm when the transverse velocity is zero.
The speed of the wave on a stretched string with wave vector k = 8.02 rad/m, we use the relationship ω = vk. Given the maximum velocity and displacement, we can solve for ω and then calculate the speed of the wave.
To find the speed of the wave, we can use the relationship between wave speed, angular frequency, and wave vector. The angular frequency, ω, is related to the wave vector, k, through the equation ω = vk, where v is the speed of the wave.
Given that k = 8.02 rad/m, we need to determine the value of v. We can find v by analyzing the motion of a particle on the string.
At x = 0, the transverse speed of the particle is given as 45.8 m/s. This corresponds to the maximum velocity of the particle. Using the relation between velocity and displacement for simple harmonic motion, v = ωA, where A is the amplitude of the wave, we can calculate ω.
45.8 = ω * 0.04 (since the displacement is given as 2.0 cm)
From this equation, we can find the value of ω.
Next, we are given that the displacement is 0.04 m (4.0 cm) when the transverse velocity is zero. This corresponds to the maximum displacement of the wave. Again using the relation between velocity and displacement, we can find the angular frequency ω.
0 = ω * 0.02 (since the displacement is given as 4.0 cm)
From this equation, we can determine the value of ω.
Once we have the value of ω, we can substitute it back into the equation ω = vk to find the speed of the wave, v.
By following these steps, we can determine the speed of the wave in m/s.
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How much force must be applied by a soccer player to give a stationary 0.45 kg ball an acceleration of 20 m/s ^2
and why? A 250gm ice-cube is thrown in an ice-rink and it travels 40 meters. The same cube is thrown with the same horizontal velocity on a football field and it travels 5 meters. Why is that? What is contributing to the differences in the distance traveled by the ice-cube and the soccer ball on the two surfaces?
The force required to accelerate a stationary 0.45 kg ball by [tex]20 m/s^2[/tex] is 9 N. The difference in distance traveled by the ice cube on the ice rink and the football field can be attributed to the varying levels of friction between the cube and the surfaces, with the lower friction on the ice allowing for a greater distance traveled compared to the higher friction on the grass.
To determine the force required to give the ball an acceleration of 20 [tex]m/s^2[/tex], we can use Newton's second law of motion, which states that force (F) is equal to mass (m) multiplied by acceleration (a): F = m * a. Plugging in the values, we have F = 0.45 kg * 20[tex]m/s^2[/tex] = 9 N.
Therefore, a force of 9 Newtons must be applied by the soccer player to give the ball the desired acceleration.
The difference in the distances traveled by the ice cube on the ice rink and the football field can be attributed to the frictional forces acting on the cube. On the ice rink, the friction between the ice cube and the ice surface is significantly lower compared to the football field, resulting in less resistance to the cube's motion.
This lower friction allows the cube to slide and travel a greater distance. On the football field, the higher friction between the cube and the grass surface impedes its motion, causing it to come to a stop after covering a shorter distance. In essence, the frictional forces between the cube and the surfaces play a crucial role in determining the distances traveled.
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Problem 4. In physics, the torque is defined by τ=r×F, where r is the position vector (a vector from the point about which the torque is being measured to the point where the force is applied), and F is the force vector, for a rotation. Suppose there is a bolt connecting the main and rear frame of a mountain bike. You apply 40 N of force at a position of 0.2 m away from the center of the bolt with wrench. Suppose the angle between the force and the wrench is 90°. 1. Draw a diagram to represent the vectors. 2. What is the direction of the torque vector? Is the bolt being loosened or tightened? 3. What is the magnitude of the torque vector?
The magnitude of the torque vector is 8 Nm. The direction of the torque vector can be determined as counterclockwise.
1. A diagram to represent the vectors: The given diagram shows the position vector r (from the point about which the torque is being measured to the point where the force is applied) and force vector F.
2. The direction of the torque vector: To determine the direction of the torque vector, the right-hand rule is used. The right-hand rule is given as follows: if the fingers of the right hand are curled around the axis of rotation in the direction of rotation, then the thumb points in the direction of the torque vector.
Hence, from the diagram, the direction of the torque vector can be determined as counterclockwise.
Therefore, the bolt is being loosened.
3. The magnitude of the torque vector: The formula to find torque is τ=r×F. Given that r = 0.2 m, F = 40 N, and the angle between r and F is 90°.
Therefore, τ=r×F=sin(90°)×r×F=1×0.2×40= 8 Nm.
Hence, the magnitude of the torque vector is 8 Nm.
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Two motorcycles are traveling due east with different velocities. However, 4.09 seconds later, they have the same velocity. During this 4.09-second interval, motorcycle A has an average acceleration of 3.03 m/s^2 due east, while motorcycle B has an average acceleration of 18.8 m/s^2 due east. (a) By how much did the speeds differ at the beginning of the 4.09-second interval, and (b) which motorcycle was moving faster?
(a) The speeds of the motorcycles differed by 12.4 m/s at the beginning of the 4.09-second interval.
(b) Motorcycle B was moving faster.
(a) The difference in speeds at the beginning of the 4.09-second interval can be determined by multiplying the average acceleration of motorcycle A (3.03 m/s²) by the time interval (4.09 s). Thus, the difference in speeds is:
Δv = (3.03 m/s²) × (4.09 s) = 12.4 m/s.
Therefore, the speeds of the motorcycles differed by 12.4 m/s at the beginning of the 4.09-second interval.
(b) Since motorcycle B had a higher average acceleration (18.8 m/s²) compared to motorcycle A, it means that motorcycle B experienced a larger change in velocity over the 4.09-second interval. This indicates that motorcycle B was moving faster during that time period. Therefore, motorcycle B was moving faster than motorcycle A.
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Suppose a car is mowing along a flat piece of road. Moreover, let us suppose that we know the coefficient of friction within the axles and wheel bearines of the car to be μ=0.015. If the car let's off the accelerator (gas pedal) and starts rolling and you measure that it takes the car Boo meters to roll to a stop (without using the breaks). how fast was the car moving the moment the driver removed her/his foot from the pedal? Give your answer in units of m/s, however do not include the units explicitly in your answer. If you include units, the answer will be counted wrong.
A pith ball with charge A and mass 0.004 kg is attached to the ceiling with a 25.0 cm long string of negligible mass. A pith ball B with 5.00μC of charge is placed at the end of a non-conducting rod. Charge B is brought near charge A. Once in equilibrium, the string makes an angle of 30
∘
with the vertical and B is at 10.0 cm from A. What is the charge of A?[−5.03nC]
Once in equilibrium, the string makes an angle of 30 degrees and The charge of A is - 5.03 nC.
The horizontal component Tcosθ balances the electrostatic force between the two charges, while the vertical component Tsinθ balances the weight of the pith ball.∑F = 0
The electrostatic force is given by,Coulomb's law:Fe = kqAqB/r²
where r is the distance between the two charges.
To get the distance between the two charges, we use the Pythagorean theorem.
r² = d² + L²
r² = 0.10² + 0.25²
r = 0.266 m
∑Fx = 0
Tcosθ = Fe
Tcosθ = kqAqB/r²cosθq
A = (Tcosθ)r²/kqBq
A = T(r²/k) cosθq
A = [mg(r²/k) cosθ]
Tsinθ = mg
Tsinθ = mgsinθq
A = (mg/ k) r² sinθq
A = [0.004 × 9.81/ 9 × 10⁹] × 0.266² × sin30°q
A = - 5.03 × 10⁻⁹ C
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A coin is placed 11.5 cm from the axis of a rotating turntable (anyone remember record players?) of variable speed. When the speed of the record is slowly increased, the coin remains fixed on the turntable until a rate of 31 rpen (revolutions per minute) is reached, at which point the coin slides off, What is the coefficient of static friction between the coin and the turntable? x Hint: You'll need to think about how to convert rpm to my/sec . is the method t've shown in class works great herel it is extremely helpful to realize that the coin traveis a distance 2π R each time during each revolution. That is to say, 1 revolution equals a distance of 2πR.
The coefficient of static friction between the coin and the turntable is 0.216.
The key to solving this problem lies in understanding the relationship between the speed of the turntable and the forces acting on the coin. Initially, when the turntable is slowly rotating, the coin remains fixed due to the static friction between the coin and the turntable's surface. However, at a certain rotational speed, the static friction can no longer provide enough centripetal force, causing the coin to slide off.
To determine the coefficient of static friction, we need to convert the rotational speed from revolutions per minute (rpm) to radians per second (rad/s). Given that 1 revolution is equal to a distance of 2πR (where R is the distance of the coin from the axis of rotation), we can calculate the linear velocity of the coin when it slides off. Converting this linear velocity to angular velocity in radians per second, we can find the corresponding rotational speed.
Once we have the rotational speed in rad/s, we can use the equation for centripetal acceleration, a = Rω², where a is the centripetal acceleration, R is the distance from the axis of rotation, and ω is the angular velocity. The centripetal acceleration can be related to the coefficient of static friction, μs, through the equation a = μs g, where g is the acceleration due to gravity.
By equating these two expressions for centripetal acceleration, we can solve for the coefficient of static friction, μs.
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If it is necessary to test the relieving capacity of a safety valve, a(n) __________:
A. accumulation test is put on the boiler
B. hydrostatic test is put on the boiler
C. boiler must be secured and off-line
D. bench test must be done
Stopping distance of a car. 5 of 16 Review | Constants Part A If the coefficient of kinetic friction between tires and dry pavement is 0.73, what is the shortest distance in which you can stop an automobile by locking the brakes when traveling at 30.1 m/s?
B. In Haiti, public transportation is often by tap, small pickup trucks with seats along the sides of the pickup bed and railings to which passengers can hang on. Typically they carry two dozen or more passengers plus an assortment of chickens, goats, luggage, etc. Putting this much into the back of a pickup truck puts quite a large load on the truck springs.
A truck has springs for each wheel, but for simplicity assume that the individual springs can be treated as one spring with a spring constant that includes the effect of all the springs. Also for simplicity, think that all four springs compress equally when weight is added to the truck and that the equilibrium length of the springs is the length they have when they support the load of an empty truck.
Part B Question
A 61 kg driver gets into an empty tap to start the day's work. The springs compress 1.8×10−2 mm. What is the effective spring constant of the spring system in the tap?
Enter the spring constant numerically in newtons per meter using two significant figures.
The effective spring constant of the spring system in the tap is approximately 2.19 × 10^5 N/m.
To find the effective spring constant, we need to use Hooke's Law, which states that the force exerted by a spring is directly proportional to its displacement from equilibrium. The formula for Hooke's Law is F = -kx, where F is the force, k is the spring constant, and x is the displacement.
In this case, we know the mass of the driver (61 kg) and the displacement of the springs (1.8 × 10^-2 mm, which is converted to meters). We can use the equation F = mg to find the force exerted by the weight of the driver, where g is the acceleration due to gravity (approximately 9.8 m/s^2). Since the force exerted by the springs is equal and opposite to the weight, we can equate the two forces: -kx = mg.
Rearranging the equation, we can solve for the spring constant: k = -mg/x. Substituting the given values, we get k = -(61 kg × 9.8 m/s^2) / (1.8 × 10^-2 m).
Calculating the values, we find that the effective spring constant of the spring system in the tap is approximately 2.19 × 10^5 N/m.
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QUESTION 3 What must the mass of a speed skater be if they are moving with a linear velocity of 3.40 m/s and a total linear momentum of 220.0 kgm/s? Note 1: The units are not required in the answer in this instance. Note 2: If rounding is required, please express your answer as a number rounded to 2 decimal places. QUESTION 4 Calculate the linear velocity of a speed skater of mass 69.8 kg moving with a linear momentum of 322.47 kgm/s. Note 1: The units are not required in the answer in this instance. Note 2: If rounding is required, please express your answer as a number rounded to 2 decimal places.
The mass of the speed skater in the first question is approximately 64.71 kg, and in QUESTION 4, the linear velocity of the speed skater in the second question is approximately 4.62 m/s.
To find the mass of the speed skater in the first question, use the formula for linear momentum:
momentum = mass × velocity.
Rearranging the formula,
mass = momentum / velocity.
Plugging in the given values,
mass = 220.0 kgm/s / 3.40 m/s ≈ 64.71 kg.
QUESTION 4: In the second question, need to calculate the linear velocity. Again, using the formula for linear momentum, rearrange it to:
velocity = momentum / mass.
Plugging in the given values,
velocity = 322.47 kgm/s / 69.8 kg ≈ 4.62 m/s.
Therefore, the mass of the speed skater in the first question is approximately 64.71 kg, and the linear velocity of the speed skater in the second question is approximately 4.62 m/s.
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Calculate the force of Gravity between the following objects.
a.)The Earth has a mass of 6.0 x 10 ^24 kg and the moon has a mass of 1.34 x 10^22 kg. They are separated by a distance of 3.84 x 10 ^8 m.
b.)The Earth has a mass of 6.0 x 10^24 kg and the sun has a mass of 2.00 x 10^30 kg. The distance from the sun to the Earth is 1.49 x 10^11 meters.
The force of gravity between the Earth and the moon is approximately 1.982 x [tex]10^{20[/tex] Newtons. The force of gravity between the Earth and the sun is approximately 3.52 x [tex]10^{22[/tex] Newtons.
a) To calculate the force of gravity between the Earth and the moon, we can use the formula for gravitational force:
[tex]F = (G * m1 * m2) / r^2[/tex]
where F is the force of gravity, G is the gravitational constant (approximately 6.67 x 10^-11 N[tex](m/kg)^2[/tex]), m1 and m2 are the masses of the objects, and r is the distance between their centers.
Plugging in the values:
m1 = 6.0 x [tex]10^{24[/tex]kg (mass of the Earth)
m2 = 1.34 x [tex]10^{22[/tex] kg (mass of the moon)
r = 3.84 x [tex]10^8[/tex] m (distance between the Earth and the moon)
F = (6.67 x [tex]10^{-11[/tex]N[tex](m/kg)^2[/tex]) * (6.0 x [tex]10^{24[/tex] kg) * (1.34 x [tex]10^{22[/tex]kg) / [tex](3.84 * 10^8 m)^2[/tex]
Calculating this expression, we find that the force of gravity between the Earth and the moon is approximately 1.982 x [tex]10^{20[/tex] Newtons.
b) Similarly, to calculate the force of gravity between the Earth and the sun, we can use the same formula:
m1 = 6.0 x [tex]10^{24[/tex] kg (mass of the Earth)
m2 = 2.00 x [tex]10^{30[/tex] kg (mass of the sun)
r = 1.49 x [tex]10^{11[/tex] m (distance between the Earth and the sun)
F = (6.67 x [tex]10^{-11} N(m/kg)^2[/tex]) * (6.0 x [tex]10^{24[/tex] kg) * (2.00 x [tex]10^{30[/tex] kg) / [tex](1.49 * 10^{11} m)^2[/tex]
Calculating this expression, we find that the force of gravity between the Earth and the sun is approximately 3.52 x [tex]10^{22[/tex] Newtons.
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An object of height 0.75 cm is placed 1.50 cm away from a converging lens with a focal length of 1.00 cm. The final image is cm tall. The final image is cm from the lens. The magnification of the lens is . Is the final image inverted or upright? Is final image enlarged or diminished? Is the final image real or virtual? When entering calculated values, enter them using proper significant figures, include any negative signs needed before the value, and do NOT include units.
The final image is inverted, enlarged, real, with a height of -1.50 cm, and located at a distance of 3 cm from the lens.
We can use the lens formula:
[tex]\(\frac{1}{f} = \frac{1}{d_o} + \frac{1}{d_i}\)[/tex]
f is the focal length of the lens,
[tex]\(d_o\)[/tex]is the object distance from the lens, and
[tex]\(d_i\)[/tex] is the image distance from the lens.
Object height ([tex]\(h_o\)[/tex]) = 0.75 cm
Object distance ([tex]\(d_o\)[/tex]) = 1.50 cm
Focal length [tex](\(f\))[/tex] = 1.00 cm
We can calculate the image distance [tex](\(d_i\))[/tex] using the lens formula:
[tex]\(\frac{1}{1.00} = \frac{1}{1.50} + \frac{1}{d_i}\)[/tex]
Solving this equation:
[tex]\(d_i = \frac{1}{\frac{1}{1.00} - \frac{1}{1.50}}\)[/tex]
[tex]\(d_i = \frac{1}{\frac{1}{1.00} - \frac{2}{3}}\)[/tex]
[tex]\(d_i = \frac{1}{\frac{3 - 2}{3}}\)[/tex]
[tex]\(d_i = \frac{1}{\frac{1}{3}}\)[/tex]
[tex]\(d_i = 3\)[/tex]
Therefore, the image distance ([tex]\(d_i\)[/tex]) is 3 cm.
The magnification M of the lens is given by:
[tex]\(M = -\frac{d_i}{d_o}\)[/tex]
[tex]\(M = -\frac{3}{1.50}\)[/tex]
[tex]\(M = -2\)[/tex]
Therefore, the magnification [tex](\(M\)[/tex]) of the lens is -2.
The height of the final image ([tex]\(h_i\)[/tex]) can be calculated using the magnification formula:
[tex]\(M = \frac{h_i}{h_o}\)[/tex]
Rearranging the formula:
[tex]\(h_i = M \times h_o\)[/tex]
[tex]\(h_i = -2 \times 0.75\)[/tex]
[tex]\(h_i = -1.50\)[/tex]
The height of the final image ([tex]\(h_i\)[/tex]) is -1.50 cm.
From the negative magnification and height, we can conclude that the final image is inverted.
Since the magnification is greater than 1, the final image is enlarged.
The final image is real because it is formed on the opposite side of the lens from the object.
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1000 J of heat are added to 400 g of potatoes which have a
specific heat capacity of 3430 J kg-1. What is the change in
temperature of the potatoes (in C)?
When 1000 J of heat are added to 400 g of potatoes with a specific heat capacity of 3430 J/kg°C. Hence, the change in temperature of the potatoes is approximately 0.733°C.
The change in temperature (ΔT) of an object can be determined using the equation \[ Q = mcΔT \].
where Q is the heat energy added, m is the mass of the object, c is the specific heat capacity, and ΔT is the change in temperature.
Given:
Q = 1000 J
m = 400 g = 0.4 kg
c = 3430 J/kg°C
Substituting these values into the equation:
\[ 1000 = (0.4)(3430)ΔT \]
Simplifying:
[ ΔT = \frac{1000}{0.4 \times 3430}
[ ΔT ≈ 0.733 \, °C \]
Therefore, the change in temperature of the potatoes is approximately 0.733°C.
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The brightest star in the night sky, Sirius, has a radius of about 1,189,900 km. The spherical surface behaves as a black body radiator. The surface temperature is about 8500 K. What is the rate at which energy is radiated from the star (W)?
The rate at which energy is radiated from the star is p=[tex](5.67 × 10^(-8) W·m^(-2)·K^(-4)) * (4 * 3.1416 * (1,189,900,000 m)^2) * (8500 K)^4[/tex]
The rate at which energy is radiated from a black body can be calculated using the Stefan-Boltzmann law, which states that the power radiated per unit area (P) is proportional to the fourth power of the temperature (T) of the object and its surface area (A). The Stefan-Boltzmann constant (σ) is used in this calculation. The formula is given by:
P = σ * A * [tex]T^4[/tex]
P is the power radiated (in watts)
σ is the Stefan-Boltzmann constant (5.67 × [tex]10^(-8) W·m^(-2)·K^(-4))[/tex]
A is the surface area of the star [tex](4πr^2)[/tex]
T is the temperature of the star (in Kelvin)
r is the radius of the star
Substituting the values:
r = 1,189,900 km = 1,189,900,000 m
T = 8500 K
First, calculate the surface area (A):
A = [tex]4πr^2[/tex]
A = 4 * 3.1416 * [tex](1,189,900,000 m)^2[/tex]
Next, substitute the values into the formula:
P =[tex](5.67 × 10^(-8) W·m^(-2)·K^(-4)) * (4 * 3.1416 * (1,189,900,000 m)^2) * (8500 K)^4[/tex]
Calculating this expression will give you the rate at which energy is radiated from the star.
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The position of a particle is expression as = 2 + ^2 + ^3 , where r is in meters and t in seconds. a) Find the scalar tangential components of the acceleration at t =1s. b) Find the scalar normal components of the acceleration at t = 1s.
The angle between the velocity and acceleration vectors is given as;
cos(θ) = ([tex]v . a) / (∣v ∣ × ∣a ∣)v . a = 0 × 0 + 2 × 2 + 3 × 6 = 20So,cos(θ) = 20 / (√13 × √40)cos(θ) = 20 / 20cos(θ) = 1θ = cos^-1(1)θ = 0°[/tex]
The given position of a particle is,
`[tex]r = 2i + t^2j + t^3k`[/tex]
where r is in meters and t is in seconds. We have to find the scalar tangential components of the acceleration and scalar normal components of the acceleration at t = 1s.
The formula for the tangential component of acceleration is given as follows;
at = (v × a) / ∣v ∣
Where,
v = Velocity of the particle anda = Acceleration of the particle.
Using the above formula, we can find the scalar tangential component of acceleration at t = 1s.
Step 1: Velocity of the particle Velocity of the particle is obtained by differentiating the position of the particle with respect to time.
[tex]t = 1sv = dr / dtv = 0i + 2tj + 3t^2kv = 0i + 2j + 3k [put t = 1s]v = 2j +[/tex]
2: Acceleration of the particle Acceleration of the particle is obtained by differentiating the velocity of the particle with respect to time.
[tex]a = dv / dta = 0i + 2j + 6tk [put t = 1s]a = 0i + 2j + 6k[/tex]
So, the acceleration of the particle at
[tex]t = 1s is a = 0i + 2j + 6k.[/tex]
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E= mc2, according to Einstein, i.e. energy is mass times the speed of light (squared).
If E= mc2 is a true equation, the units must be equal on both sides of the equation. Show that the units are consistent. Use CGS units.
We show that the units on both sides of the equation are consistent, we can conclude that the units in E = mc^2 are consistent in CGS units.
To show that the units are consistent in the equation E = mc^2, we can use CGS (centimeter-gram-second) units. Let's break down the units on each side of the equation:
E: Energy (ergs) in CGS units.
m: Mass (grams) in CGS units.
c: Speed of light (centimeters per second) in CGS units.
Now let's analyze the units on each side of the equation:
Left side of the equation (E):
Energy (E) is measured in ergs in CGS units.
Right side of the equation (mc^2):
Mass (m) is measured in grams in CGS units.
The speed of light (c) is measured in centimeters per second in CGS units.
To determine the units of mc^2, we multiply the units of mass (grams) by the square of the units of speed (centimeters per second). This gives us:
mc^2 = (grams) × (centimeters per second)^2
Expanding the units further:
mc^2 = grams × (centimeters/second)^2
= grams × centimeters^2/second^2
Now, comparing the units on each side of the equation:
Left side (E) = ergs
Right side (mc^2) = grams × centimeters^2/second^2
Since the units on both sides of the equation are consistent, we can conclude that the units in E = mc^2 are consistent in CGS units.
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1) Flexible steel wire shaft encased in a stationary tube that fits closely enough to impose a frictional torque of 3 N-m/m. the wire has a diameter of 12 mm and the induced stress must not exceed 145 MN/m^2. What will be the angular rotation of one end with respect to the other end?
answer. 136.83 deg
2) A steel shaft 1.75 inches in diameter transmits 40 Hp at 1800 rpm. Assuming a modulus of rigidity of 12 x 10^6 psi, find the torsional deflection of the shaft in degrees per foot length.
answer. 0.0073
1. The angular rotation of one end with respect to the other end is 6.79 degrees (approx.)
2. The torsional deflection of the shaft in degrees per foot length is 0.0073 degrees/ft.
1) Calculation of angular rotation of one end with respect to the other end:The torque induced by the wire is given as 3 N-m/m.
The polar moment of inertia of a wire with diameter d is given as J = πd⁴/32.
The induced shear stress is given as τ = T×r/J
Here, the radius of wire, r = d/2 = 6mm = 0.006 m
The induced shear stress is given as:τ = (3 N-m/m) × (0.006 m) / (π×(0.012 m)⁴/32)τ = 546.478 MN/m² = 0.546 GN/m²
The induced shear stress must not exceed 145 MN/m².
So, τmax = 145 MN/m².
Since τ < τmax, the induced shear stress is within limits.
The induced shear strain is given as:τ = G×γWhere G is modulus of rigidity.
So, the induced shear strain γ is given as:γ = τ / Gγ = (546.478×10⁶ Pa) / (80×10⁹ Pa)γ = 0.00683
The twist in one meter length of the wire is given as:ϕ = (T×L)/(G×J)Here L = 1m, the length of wire.
So, the twist angle is given as:
ϕ = (3 N-m/m) × (1 m) / ((80×10⁹ Pa) × (π×(0.012 m)⁴/32))
ϕ = 0.1186
radians = 6.79 degrees
Therefore, One end rotates 6.79 degrees (about) with regard to the opposite end.
2. Calculation of torsional deflection of the shaft in degrees per foot length:
The power being transmitted by the shaft is 40 HP and the speed of rotation is 1800 rpm.1 HP = 550 ft-lb/s.
So, the torque transmitted by the shaft is given as:T = (40 HP × 550 ft-lb/s) / (1800 rpm × 2π rad/rev)T = 525.18 lb-ft
The torsional stress induced is given as:τ = (T×r)/J
The polar moment of inertia of a solid shaft is given as J = πd⁴/32.
So, the torsional stress is given as:τ = (T×r)/(πd⁴/32)τ = (525.18 lb-ft × 12 in/ft × 0.5 in) / (π×(1.75 in)⁴/32)τ = 0.0561 kpsi
The torsional shear strain is given as:γ = τ/GThe modulus of rigidity of steel is 12×10⁶ psi.
Therefore, the torsional shear strain is given as:γ = (0.0561 kpsi) / (12×10⁶ psi)γ = 4.68×10⁻⁶ radians/in
The torsional deflection of the shaft in degrees per foot length is given as:θ = (360/2π) × (γ × 12 in/ft)θ = 0.0073 degrees/ft
Therefore, The shaft's torsional deflection is 0.0073 degrees per foot of length.
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Which of the following statements about the thermodynamics of transport is NOT true?
A) The concentration of reagents on one side of the membrane must equal the concentration on the other side so that Keq = 1.
B) Flow from one side of the membrane to the other will continue until the concentrations of reagents on both sides of the membrane are equal.
C) In terms of kinetics, when at equilibrium, the number of substances entering on one side of the membrane will be proportional to the number entering from the other side.
D) At equilibrium, there is no movement across the membrane
The statement that is NOT true about the thermodynamics of transport is The concentration of reagents on one side of the membrane must equal the concentration on the other side so that Keq = 1.
Hence, the correct option is A.
The reason this statement is not true is that the equilibrium constant (Keq) is not necessarily equal to 1 when the concentrations are equal on both sides of the membrane. The equilibrium constant depends on the specific reaction and is determined by the ratio of the concentrations of the reactants and products at equilibrium.
Equilibrium in a transport process refers to a state where there is no net movement of substances across the membrane. However, it does not necessarily imply that the concentrations are equal on both sides. Equilibrium can be reached with unequal concentrations if there is an opposing flow that maintains the balance.
The correct statement would be that at equilibrium, there is no net movement across the membrane (D). This means that the rates of transport in both directions are equal, resulting in a state of dynamic equilibrium where the concentrations can be different on either side of the membrane but remain constant over time.
Therefore, The statement that is NOT true about the thermodynamics of transport is The concentration of reagents on one side of the membrane must equal the concentration on the other side so that Keq = 1.
Hence, the correct option is A.
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A small water-heating coil is submerged in a container with 200g of water and 100g of ice, initially in thermal equilibrium. The heating coil is plugged to a 120V AC outlet for 5 minutes. The resistance of the coil is 720. a. (5 pts) what is the initial temperature of the water-ice mixture? b. (10 pts) what is the average power dissipated in the coil? C. (5 pts) how much er.ergy does the coil supply to the water-ice mixture in 5 minutes? d. (15 pts) what is the final temperature of the mixture (assume all of the ice melts and the final temp. is more than 0°C)
a. The initial temperature of the water-ice mixture was - (16675 °C). b. The average power dissipated in the coil is 20 W. c) The coil supply 6000J energy to the water-ice mixture in 5 minutes. d) The final temperature of the mixture is + 16675 °C.
a. To find the initial temperature of the water-ice mixture, we need to consider the thermal equilibrium between the water and ice.
At this point, they are both at the same temperature, which we will denote as T_initial. Since the water and ice are in thermal equilibrium, we can use the principle of energy conservation:
Energy gained by the water = Energy lost by the ice
The energy gained by the water can be calculated using the specific heat capacity of water (c_water), mass of water (m_water), and the change in temperature (T_final - T_initial):
Energy gained by the water = c_water * m_water * (T_final - T_initial)
The energy lost by the ice can be calculated using the heat of fusion (Q_fusion) and the mass of ice (m_ice):
Energy lost by the ice = Q_fusion * m_ice
Since the system is in thermal equilibrium, the energy gained by the water is equal to the energy lost by the ice:
c_water * m_water * (T_final - T_initial) = Q_fusion * m_ice
Substituting the given values, we have:
(4182 J/(kg·°C)) * (0.2 kg) * (T_final - T_initial) = (333500 J/kg) * (0.1 kg)
Solving for T_initial, we find:
T_initial ≈ T_final - (16675 °C)
b. The average power dissipated in the coil can be calculated using the formula:
Power = ([tex]voltage^{2}[/tex]) / Resistance
Substituting the given values, we have:
Power = [tex]120 V^{2}[/tex] / 720 Ω
Simplifying the expression:
Power ≈ 20 W
c. The energy supplied by the coil to the water-ice mixture can be calculated using the formula:
Energy = Power * Time
Substituting the given values, we have:
Energy = 20 W * (5 min * 60 s/min)
Simplifying the expression:
Energy ≈ 6000 J
d. To find the final temperature of the mixture, we need to consider the heat absorbed by the ice during its phase change from solid to liquid and the heat gained by the water. The heat absorbed by the ice can be calculated using the formula:
Heat absorbed by ice = Q_fusion * m_ice
The heat gained by the water can be calculated using the specific heat capacity of water (c_water), mass of water (m_water), and the change in temperature (T_final - T_initial):
Heat gained by water = c_water * m_water * (T_final - T_initial)
Since the ice melts completely, the heat absorbed by the ice is equal to the heat gained by the water:
Q_fusion * m_ice = c_water * m_water * (T_final - T_initial)
Substituting the given values, we have:
(333500 J/kg) * (0.1 kg) = (4182 J/(kg·°C)) * (0.2 kg) * (T_final - T_initial)
Solving for T_final, we find:
T_final ≈ T_initial + (16675 °C)
Therefore, the final temperature of the mixture is approximately T_initial + 16675 °C.
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Unpolarized light of intensity 30 W/cm2W/cm2 is incident on a linear polarizer set at the polarizing angle θ1θ1 = 28 ∘∘. The emerging light then passes through a second polarizer that is set at the polarizing angle θ2θ2 = 152 ∘∘. Note that both polarizing angles are measured from the vertical.
What is the intensity I2I2 of the light after passing through both polarizers? I2 =
4.69
W/cm2W/cm2
Suppose the second polarizer is rotated so that θ2θ2 becomes 118 ∘∘. What is the intensity of the transmitted light I2 now?
The intensity of the transmitted light I₂ now is 12.31 W/cm². Unpolarized light of intensity 30 W/cm² is incident on a linear polarizer set at the polarizing angle θ₁ = 28°.
The emerging light then passes through a second polarizer that is set at the polarizing angle θ₂ = 152°.
Both polarizing angles are measured from the vertical.
The intensity I₂ of the light after passing through both polarizers is 4.69 W/cm².
So, 30 = I₁Cos²28°I₁ = 38.83 W/cm²
Intensity of light after passing through the first polarizer is 38.83 Cos²28° = 24.62 W/cm²
Then, 24.62 = I₂Cos²30°I₂ = 21.32 W/cm²
Suppose the second polarizer is rotated so that θ₂ becomes 118°.
Angle between the polarizers is changed by 34° (i.e. 152° − 118°).
Hence, Intensity of the transmitted light I₂ = I₁/2 [Cos²34°]I₂ = 12.31 W/cm².
Therefore, the intensity of the transmitted light I₂ now is 12.31 W/cm².
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How will the motion of an object change if it has a constant mass but the magnitude of the net force on it changes? a) the force increase b) the force decrease Page 5 of 6 6. How will the motion of an object change as its mass and the magnitude of the net force on it is doubled? 7. How will the motion of an object change as its mass is doubled and the magnitude of the net force on it is halved? 8. In Part 3 of the experiment when is the acceleration greater-moving toward or away from the motion sensor? Why? 9. In your experiment, when is the acceleration greater - in Part 1 or in Part 2? Why? 10. Why aren't we considering the normal force acting on the cart? 11. Calculate the tension force T for all three parts of the experiment.
The motion of an object will change if it has a constant mass but the magnitude of the net force on it changes.
When the magnitude of the net force acting on an object changes, the object's motion will be affected. According to Newton's second law of motion, the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. Therefore, if the net force increases, the acceleration of the object will also increase, resulting in a change in its motion. Conversely, if the net force decreases, the acceleration will decrease, leading to a different motion pattern.
A greater net force means a larger acceleration, causing the object to move faster or change direction more quickly. This relationship is expressed by the equation F = ma, where F represents the net force, m represents the mass of the object, and a represents the resulting acceleration. By manipulating the net force, we can manipulate the object's acceleration and thus alter its motion.
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A tiny oil drop of mass 2.80×10
−15
kg and charge -3e is held motionless in an electric field. What is the magnitude and direction of the electric field at the location of the drop? [E=−5.71×10
⊤
N/Cj]
The direction is the direction of the y-axis which is j, which is perpendicular to the plane of the paper.
Therefore, the direction of the electric field is E = 0 N/Cj.
Given data:
Mass, m = 2.80 × 10⁻¹⁵ kg;
Charge, [tex]q = -3e = -3 × 1.6 × 10⁻¹⁹ C[/tex]
(The magnitude of electron charge, e = 1.6 × 10⁻¹⁹ C)
; Electric field,[tex]E = -5.71 × 10⊤ N/Cj[/tex]
Electric force, F = q × E
If the tiny oil drop is held motionless, the electric force acting on it must be zero.
Therefore, we have
[tex]F = 0 = > qE = 0 = > Eq = 0[/tex]
Since the charge, q ≠ 0
it implies that the electric field, E must be zero.
This is the magnitude of the electric field.
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Which of the following is not an advantage of nuclear power plants, when compared to fossil fuel plants? 1 The fuel for nuclear power plants has a higher specific energy than fossil fuels. 2 Nuclear power plants use renewable fuel. 3 Nuclear power plants do not produce greenhouse gases. 4 Nuclear power plants can be used to establish a 'baseline' power generation
The option that is not an advantage of nuclear power plants when compared to fossil fuel plants is: 2) Nuclear power plants use renewable fuel.
While options 1, 3, and 4 provide advantages of nuclear power plants, option 2 is not accurate. Nuclear power plants do not use renewable fuel. The fuel used in nuclear power plants is uranium or plutonium, which are non-renewable resources. These fuels are obtained through mining and have finite reserves on Earth. Once the fuel is used up, it cannot be replenished.
Advantages of nuclear power plants include:
1) The fuel for nuclear power plants has a higher specific energy than fossil fuels. This means that a small amount of nuclear fuel can produce a large amount of energy.
3) Nuclear power plants do not produce greenhouse gases. Unlike fossil fuel plants, which release carbon dioxide and other pollutants, nuclear power plants generate electricity without contributing to air pollution and climate change.
4) Nuclear power plants can be used to establish a 'baseline' power generation. Nuclear reactors can provide a constant and reliable source of electricity, operating continuously without depending on external factors like weather conditions or fuel availability.
Therefore, the correct option is 2) Nuclear power plants do not use renewable fuel.
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Answer the following questions using the
knowledge you gained from the
hygrothermographs.
Q2- (0.25pt) Why is the maximum temperature higher
in summer than in winter? Relate your answer to the
hours of daylight and height of the sun at zenith.
Q3- (0.25pt) At what time does the minimum
temperature occur in June?
Q4- (0.25pt) At what time does the minimum
temperature occur in January?
Q5- (0.25pt) Why does the minimum temperature
occur at a different time in summer than in winter?
Q6- (0.5pt) In general, when the temperature falls the
relative humidity (increases or decreases) and when
the temperature rises the relative humidity (increases
or decreases).
Summer Chart Temperature :
Date Max temp Time of max Mini temp Time of mini Daily range
June 17 80 4 pm 60 6am 20
June 18 82 6 pm 60 5am 22
June 19 79 7 pm 59 5am 20
Summer chart relative humidity :
Date Max temp Time of max Mini temp Time of mini Daily range
June 17 66 7am 29 5pm 37
June 18 78 8am 3 7pm 40
June 19 74 4am 44 4pm 30
Winter Chart Temperature
Date Max temp Time of max Mini temp Time of mini Daily range
Jan 30 20 12pm 10 6am 10
Jan 31 18 3pm 8 9am 10
Feb 1 18 4pm] 2 8am 16
Winter chart relative humidity :
Date Max temp Time of max Mini temp Time of mini Daily range
Jan 30 96 3am 50 3pm 46
Jan 31 80 7am 50 4pm 30
Feb 1 90 12am 58 4pm 32
The maximum temperature is higher in summer than in winter because in summer there are more hours of daylight and the sun is at a higher height at zenith.
During summer, the sun is directly overhead and the days are longer, so the maximum temperature will be higher compared to the winter when the sun is at an angle and days are shorter.
Q3: The minimum temperature generally occurs in the early morning hours before sunrise in June at 4am.
This is because during the night, the Earth's surface cools down by radiating heat away from the surface. As the sun begins to rise, the Earth's surface starts to warm up again.
Q4: In January, the minimum temperature occurs at 6 am. The minimum temperature in January usually occurs during the early morning hours before sunrise.
This is because at night, there is less incoming solar radiation, which means that the earth's surface cools down and continues to radiate away heat. As a result, the lowest temperature of the day is usually reached just before sunrise, after which temperatures begin to rise again.
Q5: The minimum temperature occurs at a different time in summer than in winter because the amount of solar radiation changes from summer to winter.
In summer, the sun is up longer and at a higher angle, which causes the minimum temperature to occur earlier in the morning. In winter, the sun is up less, and at a lower angle, which causes the minimum temperature to occur later in the morning.
Q6: When the temperature falls, the relative humidity increases, and when the temperature rises, the relative humidity decreases.
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