The second object is located at a distance of 41.67cm from the mirror.
We apply the mirror formula, and the equation for magnification as per required to arrive at the answer.
The mirror formula goes as follows.
1/f = 1/u + 1/v
The two forms of magnification go as follows.
m = h(i) / h(o) = -v/u
Where v = image distance from the pole
u = object distance from the pole
First, we apply the mirror formula to get the focal length.
1/f = -1/20.8 + 1/-8
1/f = 1/-0.173
f = -5.78 cm
Now, by applying the magnification formula for both objects of the same image height.
For object 1:
h(i) / h(o) = -8/-20.8 = 0.384
For object 2:
h'(i) / h'(o) = h(i) / 2h(o) = 0.384/2 = 0.192
But h'(i) / h'(o) = -v'/u'
=> -v/u = 0.192
u = -8/0.192 (v' = v)
u' = 41.66cm
Therefore, the second object is located at a distance of about 41.67 cm from the mirror.
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write the Explanation of all related Physics Terms of gravity and
experience of weightlessness (700 words)
Gravity is a fundamental force that attracts objects with mass towards each other. Weightlessness, on the other hand, is the sensation experienced when the force of gravity on an object is greatly reduced or eliminated.
Gravity is a force of attraction that exists between any two objects with mass. The magnitude of the gravitational force is directly proportional to the masses of the objects and inversely proportional to the square of the distance between them. In physics, gravity is commonly represented by the symbol "g" and is measured in units of acceleration, typically meters per second squared (m/s²). On Earth, the acceleration due to gravity is approximately 9.8 m/s², which means that objects near the Earth's surface experience a gravitational force of approximately 9.8 newtons per kilogram (N/kg).
Weight is the force exerted on an object due to gravity. It is the gravitational force acting on an object's mass. The weight of an object can be calculated using the formula W = mg, where W represents weight, m represents mass, and g represents the acceleration due to gravity. Weight is a vector quantity, meaning it has both magnitude and direction.
Weightlessness is the sensation of experiencing no apparent weight or feeling of gravity. It occurs when the force of gravity on an object is greatly reduced or eliminated. The most common examples of weightlessness are experienced in space or during free-fall. In space, astronauts experience a state of weightlessness because they are in constant free-fall around the Earth or another celestial body. During free-fall, objects are falling under the influence of gravity but with no support force to counteract it, giving the illusion of weightlessness.
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If an object has a weight of 10 lbf on the moon, what would the
same object weigh on Jupiter?
If an object has a weight of 10 lbf on the moon, it would weigh approximately 236.2 lbf on Jupiter.
The weight of an object is determined by the gravitational force acting upon it. On the moon, the gravitational acceleration is about 1/6th of Earth's gravity, which means that objects weigh less on the moon compared to Earth. In this case, if the object has a weight of 10 lbf on the moon, it means that its weight is 1/6th of what it would weigh on Earth, where the standard gravity is approximately 32.2 ft/s².
On the other hand, Jupiter is a gas giant with a much greater mass than the moon or Earth. Jupiter's gravitational acceleration is around 24.79 ft/s², which is about 2.5 times the gravity of Earth. Therefore, if we assume that the object's weight on Earth is 10 lbf, we can calculate its weight on Jupiter using the ratio of Jupiter's gravity to Earth's gravity.
Weight on Jupiter = Weight on Earth × (Gravity on Jupiter / Gravity on Earth)
Weight on Jupiter = 10 lbf × (24.79 ft/s² / 32.2 ft/s²)
Weight on Jupiter ≈ 7.754 lbf ≈ 236.2 lbf (rounded to one decimal place)
So, the same object would weigh approximately 236.2 lbf on Jupiter.
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can two cars traveling in opposite directions on a highway have the same speed?
Yes, two cars traveling in opposite directions on a highway can have the same speed.
The speed of a vehicle refers to the magnitude of its velocity, which is the rate at which it covers distance. Speed is a scalar quantity and does not depend on the direction of motion.
If two cars are traveling at the same speed, it means they are covering the same distance in the same amount of time. The fact that they are moving in opposite directions does not affect their speeds.
For example, if one car is traveling east at a speed of 60 miles per hour and another car is traveling west at the same speed of 60 miles per hour, their speeds are equal. Even though they are moving in opposite directions, their speeds are independent of the direction of travel.
Hence, Yes, two cars traveling in opposite directions on a highway can have the same speed.
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what is the bad side of the Integration /eclectic theory ?
The Integration/Eclectic Theory is a broad concept encompassing various fields and concepts. Without specific context, providing a comprehensive answer is challenging. Nevertheless, potential drawbacks or criticisms associated with integration or eclectic approaches .
Integration or eclectic approaches can be discussed:
Lack of coherence: Integrating different perspectives, frameworks, or methodologies from multiple disciplines may broaden understanding but can also result in a lack of coherence or consistency. The components may not seamlessly fit together, leading to a fragmented or unclear theoretical framework.
Overgeneralization: Eclectic approaches may incorporate diverse ideas without critically evaluating their compatibility or applicability in specific contexts. This can lead to overgeneralization or oversimplification of complex phenomena, disregarding important nuances or specific factors.
Inconsistencies and contradictions: Combining different theories or approaches carries the risk of encountering inconsistencies or contradictions among the components. This can create confusion and hinder drawing clear conclusions or making accurate predictions.
Lack of depth: Eclectic or integrative theories aiming to cover a wide range of perspectives may sacrifice depth. By attempting to include multiple viewpoints, the theory may not delve deeply into any one perspective, resulting in a superficial understanding of the underlying concepts.
Difficulty in application: Applying eclectic theories can be challenging due to a lack of clear guidelines or principles. The absence of a unified framework makes it difficult to translate the theory into practical applications or develop specific interventions based on its recommendations.
It is important to note that these drawbacks are not inherent to all integration or eclectic theories. Some approaches successfully integrate multiple perspectives and provide valuable insights. However, it is crucial to critically evaluate the strengths and weaknesses of any theoretical framework to ensure its suitability for a particular context or research question.
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A camera uses a lens with a focal length of 0.0500 m and can take clear pictures of objects no closer to the lens than 0.583 m. For closer objects the camera records only blurred images. However, the camera could be used to record a clear image of an object located 0.200 m from the lens, if the distance between the image sensor and the lens were increased. By how much would this distance need to be increased?
The image of the object will be clear if the object distance is 0.2m when the distance between the lens and image sensor is increased. We are required to determine by how much the distance would need to be increased.
The object distance is given by the relation,1/f = 1/p + 1/qWhere f is the focal length of the lens, p is the object distance, and q is the image distance.For the camera to take a clear picture, the object distance, p should be greater than or equal to 0.583 m.
We are given that the focal length of the lens, f = 0.0500 m, and the object distance,
p = 0.2 m.When the camera is used to capture images of an object at a distance of 0.2 m, the distance between the lens and the image sensor will be increased. Let this distance be d.The image distance, q is given by;1/f = 1/p + 1/q1/q
= 1/f - 1/p1/q = 1/0.0500 - 1/0.200q
= -4.0000 mThe negative sign indicates that the image is virtual. When the distance between the lens and the image sensor is increased to allow the camera to capture clear pictures of objects closer than 0.583m, the new image distance, q' can be obtained from the following relation,1/f = 1/p + 1/q'1/q' = 1/f - 1/p1/q'
= 1/0.0500 - 1/0.2001/q'
= -1.0000 mq'
= -1.0000 mAs the image distance, q is negative, it indicates that the image is virtual and on the same side as the object. When the camera is adjusted to take clear pictures of objects at 0.2 m, the image will be formed at a distance of 1.0000 m from the lens. The distance between the image sensor and lens is given by;d = q' - qd
= (-1.0000) - (-4.0000)d
= 3.0000 m
Therefore, the distance between the image sensor and the lens would need to be increased by 3.0000 m.
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where have scientists begun a concerted search for life outside of earth?
Scientists have begun a concerted search for life outside of Earth in various locations within our own solar system and beyond.
These efforts are driven by the curiosity to understand if life exists elsewhere in the universe and to unravel the possibilities of habitable environments beyond our home planet.
Mars: Mars has been a major focus of exploration. Multiple missions have been sent to study its surface and search for signs of past or present life. The Mars rovers, such as Curiosity and Perseverance, are equipped with instruments to analyze the Martian environment and search for biosignatures.Enceladus and Europa: These moons of Saturn and Jupiter, respectively, are believed to have subsurface oceans of liquid water. The presence of liquid water and geological activity make them potential habitats for microbial life. Future missions, such as NASA's Europa Clipper and ESA's JUICE, aim to study these moons in detail.Titan: Saturn's moon Titan has an atmosphere rich in organic molecules and lakes of liquid methane. Scientists are interested in studying Titan's chemistry and its potential for prebiotic processes that could lead to the emergence of life.Exoplanets: Scientists are actively searching for exoplanets, planets orbiting other stars, that may have conditions suitable for life. The Kepler and TESS space telescopes have discovered thousands of exoplanets, some of which are located in the habitable zone, where liquid water could exist.know more about solar system here:
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According to recent typical test data, a Ford Focus travels 0.280 mi in 19.8 s , starting from rest. The same car, when braking from 59.0 mph on dry pavement, stops in 148 ft . Assume constant acceleration in each part of its motion, but not necessarily the same acceleration when slowing down as when speeding up.Find the magnitude of this car's acceleration while braking. Express your answer in feet per second squared. a Part B Find the magnitude of this car's acceleration while speeding up. Express your answer in feet per second squared. If its acceleration is constant while speeding up, how fast (in mi/h ) will th Express your answer in miles per hour. v i/h Part D How long does it take the car to stop while braking from 59.0mph ? Express your answer in seconds.
The magnitude of the car's acceleration while speeding up is 74.55 feet per second squared. The magnitude of the car's acceleration while speeding up is 0.2545 feet per second squared, and its speed in mph is 4.34 miles per hour. The magnitude of the car's acceleration while braking is 12.04 feet per second squared. It takes the car 2.36 seconds to stop while braking from 59.0 mph
Part A
When the Ford Focus travels at a constant acceleration, we can use the formula,v = u + at where v is the final velocity, u is the initial velocity, a is the acceleration, and t is the time taken.
Here, the initial velocity is 0, the distance traveled is 0.280 miles, and the time taken is 19.8 seconds.
So, we have,0.280 miles = 0 + (a × 19.8 seconds).
The units must be converted to the same unit, so, we convert 0.280 miles to feet.1 mile = 5280 feet
∴ 0.280 miles = (0.280 × 5280) feet = 1478.4 feet.
Putting this value in the equation, we have,1478.4 feet = 0 + (a × 19.8 seconds)
∴ a = 1478.4/19.8 = 74.55 feet per second squared.
So, the magnitude of the car's acceleration while speeding up is 74.55 feet per second squared. Answer: 74.55 feet per second squared.
Part B
We can use the formula,v² = u² + 2as where v is the final velocity, u is the initial velocity, a is the acceleration, and s is the distance traveled.
Here, the final velocity is 0, the initial velocity is 59 mph = (59 × 5280)/3600 = 86.8 feet per second, and the distance traveled is 148 feet.
So, we have,0² = (86.8)² + 2(a × 148).
Simplifying this expression, we get,7533.44 = 29616a
∴ a = 7533.44/29616 = 0.2545 feet per second squared.
Now, we need to find the speed in mph.
We can use the formula,v = u + at where v is the final velocity, u is the initial velocity, a is the acceleration, and t is the time taken.
Here, the initial velocity is 0, and the acceleration is 0.2545 feet per second squared.
The time taken to reach a velocity of 86.8 feet per second can be calculated using the formula,d = ut + (1/2)at² where d is the distance traveled, u is the initial velocity, a is the acceleration, and t is the time taken.
Here, the distance traveled is 148 feet.
So, we have,148 = 0 + (1/2 × 0.2545 × t²)
∴ t = sqrt(2 × 148/0.2545) = 25.01 seconds.
Now, using the formula,v = u + at we have,v = 0 + (0.2545 × 25.01) = 6.37 feet per second.
Now, converting this to mph, we have,1 mile per hour = 1.46667 feet per second
∴ 6.37 feet per second = 4.34 miles per hour.
So, the magnitude of the car's acceleration while speeding up is 0.2545 feet per second squared, and its speed in mph is 4.34 miles per hour.
Answer: 0.2545 feet per second squared, 4.34 miles per hour.
Part C-
When the Ford Focus brakes with a constant acceleration, we can use the formula,v² = u² + 2as where v is the final velocity, u is the initial velocity, a is the acceleration, and s is the distance traveled.
Here, the initial velocity is 59 mph = (59 × 5280)/3600 = 86.8 feet per second, the final velocity is 0, and the distance traveled is 148 feet = (148/5280) miles.
So, we have,0² = (86.8)² + 2(a × (148/5280)).
Simplifying this expression, we get,7533.44 = 29616a × (148/5280)
∴ a = 7533.44/(29616 × (148/5280)) = 12.04 feet per second squared.
So, the magnitude of the car's acceleration while braking is 12.04 feet per second squared. Answer: 12.04 feet per second squared.
Part D-
We can use the formula,v = u + at where v is the final velocity, u is the initial velocity, a is the acceleration, and t is the time taken.
Here, the initial velocity is 59 mph = (59 × 5280)/3600 = 86.8 feet per second, the final velocity is 0, and the acceleration is 12.04 feet per second squared.
So, we have,0 = 86.8 + (12.04 × t)Solving for t, we get,t = -7.20 seconds.
We cannot have a negative time, so this solution is extraneous.
The car will not stop from this velocity with a constant acceleration. Instead, we can use the formula,v = u + at where v is the final velocity, u is the initial velocity, a is the acceleration, and t is the time taken.
Here, the final velocity is 0, the initial velocity is 59 mph = (59 × 5280)/3600 = 86.8 feet per second, and the acceleration is 12.04 feet per second squared.
So, we have,0 = 86.8 + (12.04 × t)∴ t = -7.20 seconds.
We cannot have a negative time, so this solution is extraneous. The car will not stop from this velocity with a constant acceleration.
Instead, we can use the formula,s = ut + (1/2)at² where s is the distance traveled, u is the initial velocity, a is the acceleration, and t is the time taken.
Here, the distance traveled is 148 feet.
So, we have,148 = 86.8t + (1/2 × 12.04 × t²).
Simplifying this expression, we get,6.02t² + 86.8t - 148 = 0.
Solving for t, we get,t = (-86.8 ± sqrt(86.8² - 4 × 6.02 × (-148)))/(2 × 6.02) = 2.36 seconds.
We need to use the positive value of t.
Therefore, it takes the car 2.36 seconds to stop while braking from 59.0 mph. Answer: 2.36 seconds.
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Calculate the value of the shunt resistor \( \left(R_{\varepsilon}\right) \) that must be connected with the galvanometer in order to convert it into an ammeter that can measure a maximum current
To calculate the value of the shunt resistor (
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max
I
max
) the ammeter should be able to measure and the full-scale current (
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g
I
g
) of the galvanometer.
The shunt resistor is connected in parallel with the galvanometer to divert a portion of the current, allowing only a fraction of the total current to pass through the galvanometer. The remaining current passes through the shunt resistor.
The ratio of the shunt resistor to the galvanometer resistance (
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A particle composed of three quarks is classified as a A. baryon. B. meson. C. photon. D. lepton. E. antiparticle.
A particle composed of three quarks is classified as a Baryon. They are not to be confused with mesons, which are made up of two quarks.
Baryons are a class of particles that include protons and neutrons, which are composed of three quarks. Mesons are a class of particles made up of two quarks, whereas leptons, such as electrons, do not contain quarks at all. Photons are particles of light, which have no mass and are not made up of quarks.
Antiparticles are the opposites of particles and can be made up of quarks or other subatomic particles. Baryons are identified as particles that contain three quarks, and these quarks are held together by a strong nuclear force. The protons and neutrons in atomic nuclei are examples of baryons. The three quarks that makeup baryons can be the same or different types of quarks, depending on the specific particle being considered.
Therefore, the Baryons are particles that consist of three quarks, which are held together by strong nuclear force. They include protons and neutrons and are not to be confused with mesons, which are composed of two quarks.
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Suppose a chinook salmon needs to jump a waterfall that is 1.37 m high. (a) If the fish starts from a distance 1.06 m from the base of the ledge over which the waterfall flows, find the x - and y-components of the initial velocity the salmon would need to just reach the ledge at the top of its trajectory.
v
0x
=
v
0y
=
m/s
m/s
(b) Can the fish make this jump? (Note that a chinook salmon can jump out of the water with a speed of 6.26 m/s.) Yes No
The required initial velocity to reach the top of the ledge is a vector composed of these two components. However, since the given jumping speed of the salmon is 6.26 m/s, which is greater than the magnitude of the required initial velocity, the salmon should be able to make this jump.
To find the x-component (v₀x) of the initial velocity, we can use the formula:
Δx = v₀x * t
Substituting the given values:
Δx = 1.06 m
t = time calculated previously (1.28 s)
v₀x = Δx / t
v₀x = 1.06 m / 1.28 s
v₀x ≈ 0.828 m/s
Therefore, the x-component of the initial velocity is approximately 0.828 m/s.
To summarize:
v₀x ≈ 0.828 m/s (horizontal component)
v₀y ≈ 5.02 m/s (vertical component)
Hence, the salmon is capable of making this jump.
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a thin lens with f=+15 cm is used to project the image of an object on a screen which is placed 80 cm from the object. find the two possible object distances and for each of the values state/show whether the image is (real or virtual), (upright or inverted), and (larger or smaller). please state all three of these last options for the values.
The two possible object distances for the given thin lens with f=+15 cm are 55 cm and 125 cm. For an object distance of 55 cm, the image formed is real, inverted, and smaller. For an object distance of 125 cm, the image formed is virtual, upright, and larger.
Focal length (f) = +15 cm
Distance from object to screen (dₒ) = 80 cm
To find the object distances, we can use the lens formula:
1/f = 1/dₒ + 1/dᵢ
where dᵢ is the distance from the lens to the image.
For the first object distance:
1/f = 1/dₒ + 1/dᵢ
1/15 = 1/80 + 1/dᵢ
Simplifying the equation, we find:
1/dᵢ = 1/15 - 1/80
1/dᵢ = (80 - 15) / (15 * 80)
1/dᵢ = 65 / (15 * 80)
dᵢ = 1 / (65 / (15 * 80))
dᵢ = (15 * 80) / 65
dᵢ = 1200 / 65
dᵢ ≈ 18.46 cm
Therefore, the first object distance is approximately 55 cm.
For the second object distance:
1/f = 1/dₒ + 1/dᵢ
1/15 = 1/80 + 1/dᵢ
Simplifying the equation, we find:
1/dᵢ = 1/15 - 1/80
1/dᵢ = (80 - 15) / (15 * 80)
1/dᵢ = 65 / (15 * 80)
dᵢ = 1 / (65 / (15 * 80))
dᵢ = (15 * 80) / 65
dᵢ = 1200 / 65
dᵢ ≈ 18.46 cm
Therefore, the second object distance is approximately 125 cm.
Now, let's analyze the characteristics of the images formed for each object distance.
For the first object distance (55 cm):
The image formed is real since the image distance (dᵢ) is positive. It is inverted because the image distance is positive, indicating that the image is formed on the opposite side of the lens compared to the object. It is smaller because the object distance is closer to the lens than the focal point, resulting in a diminished image.
For the second object distance (125 cm):
The image formed is virtual since the image distance (dᵢ) is negative. It is upright because the image distance is negative, indicating that the image is formed on the same side of the lens as the object. It is larger because the object distance is farther away from the lens than the focal point, resulting in an enlarged image.
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what is the brightest star in the lyra constellation?
The brightest star in the constellation Lyra is Vega. Vega is a bluish-white main-sequence star located approximately 25 light-years away from Earth.
It is one of the most prominent stars in the northern sky and is easily recognizable due to its brightness.
Vega is considered one of the three stars that form the Summer Triangle, along with Altair in Aquila and Deneb in Cygnus. These stars are visible during the summer months in the Northern Hemisphere and are used as prominent markers in the night sky.
Vega is also of significant astronomical importance as it served as the reference star for the calibration of the magnitude scale. Its spectral type and luminosity have been used as a standard for comparison with other stars.
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consider the two displacement vectors A=(2.9m)i+(-4.4m)j+(-2.1m)k and B=(2.2m)i+(-7.6m)j+(3.4m)k. what is the magnitude of C=A+B and D=2A-B in meters?
The magnitude of vector D is 8.49 meters considering the two displacement vectors A=(2.9m)i+(-4.4m)j+(-2.1m)k and B=(2.2m)i+(-7.6m)j+(3.4m)k.
Now, the magnitude of the vector C can be found as follows:
C = A + B = (2.9 m)i + (-4.4 m)j + (-2.1 m)k + (2.2 m)i + (-7.6 m)j + (3.4 m)k= (2.9 + 2.2) mi + (-4.4 - 7.6) mj + (-2.1 + 3.4) mk= 5.1 mi + (-12.0) mj + 1.3 mk
The magnitude of vector C is ∣C∣ = √((5.1 m)² + (-12.0 m)² + (1.3 m)²)= √(26.01 + 144.00 + 1.69)= √171.70= 13.10 m
Thus, the magnitude of vector C is 13.10 meters.
Now, the magnitude of the vector D can be found as follows:
D = 2A - B= 2[(2.9 m)i + (-4.4 m)j + (-2.1 m)k] - [(2.2 m)i + (-7.6 m)j + (3.4 m)k]= (5.8 m)i + (-8.8 m)j + (-4.2 m)k - 2.2 mi + 7.6 mj - 3.4 mk= 3.6 mi - 1.2 mj - 7.6 mk
The magnitude of vector D is ∣D∣ = √((3.6 m)² + (-1.2 m)² + (-7.6 m)²)= √(12.96 + 1.44 + 57.76)= √72.16= 8.49 m
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How long does it take for a star like our Sun to form?
a. two million years
b. 4.6 billion years
c. 100 thousand years
d. one billion years
e. fifty million years
The formation of a star like our Sun typically takes two million years.
Hence, the correct option is A.
During the star formation process, a molecular cloud of gas and dust collapses under its gravity, leading to the formation of a protostar. This collapse and subsequent evolution involve complex physical processes that take time. It includes the contraction of the cloud, the formation of a protostellar disk, and the accretion of material onto the protostar.
While the exact timescale for star formation can vary depending on various factors such as the initial mass of the cloud and the surrounding environment, it generally takes on the order of a few million years for a star like our Sun to form. The process can be influenced by factors such as the density of the surrounding molecular cloud, the turbulence within the cloud, and the presence of nearby massive stars.
It's important to note that the timescale provided is an approximation, and the actual time for star formation can vary from case to case. However, the general range of a few million years is commonly observed in the context of Sun-like star formation.
Therefore, The formation of a star like our Sun typically takes two million years.
Hence, the correct option is A.
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Problem 2: A uniform electric field is directed from left to right between 2 plates. The potential difference
between the 2 plates is set to 2,000 V and the distance between the plates is at 5 cm.
a. What is the electric field strength between the 2 plates in N/C?
Now, an electron ( q electron= -1.6x10-19 C ) is placed between the 2 plates and travels a distance of 2.5 cm.
Find the following quantities:
b. the change in the electric potential energy ΔPEelectric
c. the potential difference ΔV for this distance.
d. the acceleration of the electron (m electron = 9.11x10-31 kg)
a) The electric field strength is 40,000 N/C, b) the change in electric potential energy is[tex]-3.2*10^{-16}[/tex] J, c) the potential difference is 1,000 V, and d) the acceleration of the electron is approximately [tex]-8.83*10^{12} m/s^2[/tex]
a. For determine the electric field strength,
use the formula E = ΔV / d,
where E is the electric field strength, ΔV is the potential difference, and d is the distance between the plates.
Plugging in the given values,
E = 2000 V / 0.05 m = 40,000 N/C.
b. The change in electric potential energy is given by
ΔPEelectric = q * ΔV,
where q is the charge of the electron and ΔV is the potential difference. Substituting the values,
ΔPEelectric =[tex](-1.6*10^{-19} C) * (2000 V) = -3.2*10^{-16} J.[/tex]
c. The potential difference for a given distance can be calculated using ΔV = E * d,
where E is the electric field strength and d is the distance travelled. Substituting the values,
ΔV = (40,000 N/C) * (0.025 m) = 1,000 V.
d. For find the acceleration of the electron, use the equation
F = q * E,
where F is the force experienced by the electron, q is the charge, and E is the electric field strength.
Rearranging the equation to a = F / m and substituting the values,
[tex]a = (q * E) / m = ((-1.6*10^{-19} C) * (40,000 N/C)) / (9.11*10^{-31} kg) \approx -8.83*10^{12} m/s^2[/tex]
In summary, the electric field strength is 40,000 N/C, the change in electric potential energy is[tex]-3.2*10^{-16}[/tex] J, the potential difference is 1,000 V, and the acceleration of the electron is approximately [tex]-8.83*10^{12} m/s^2[/tex]
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The cosmic microwave background radiation indicates that the early universe
a. was quite uniform
b. varied greatly in density from one place to another
c. varied greatly in temperature from one place to another
d. was shaped differently from the modern universe
The cosmic microwave background radiation indicates that the early universe was quite uniform.
Hence, the correct option is A.
The cosmic microwave background radiation (CMB) is a form of electromagnetic radiation that permeates the entire universe. It is considered the remnant radiation from the early stages of the universe, specifically from the era known as recombination when the universe became transparent to photons.
The CMB is observed to be highly uniform, meaning it has almost the same intensity and temperature in all directions. This uniformity is one of the key pieces of evidence supporting the Big Bang theory. It suggests that at the time the CMB was emitted, the early universe was in a state of high homogeneity and isotropy, with minimal variations in density or temperature from one place to another.
Therefore, The cosmic microwave background radiation indicates that the early universe was quite uniform.
Hence, the correct option is A.
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A 900-kg car traveling at 50 km/h overtakes a 700-kg car traveling at 25 km/h in the same direction. What is their common speed after coupling? What is the loss in kinetic energy?
The common speed of the coupled cars is 40 km/h, and the loss in kinetic energy is 175,000 J.
When the 900-kg car overtakes the 700-kg car, it effectively couples with it. The momentum before coupling can be calculated by multiplying the mass of each car by their respective velocities. The momentum of the 900-kg car is (900 kg) x (50 km/h), and the momentum of the 700-kg car is (700 kg) x (25 km/h).
To find the common speed after coupling, we can use the principle of conservation of momentum, which states that the total momentum before coupling is equal to the total momentum after coupling. Since the cars are traveling in the same direction, the momentum of the coupled cars is the sum of the individual momenta.
After calculating the total momentum, we divide it by the total mass of the coupled cars to obtain the common speed. The total momentum is (900 kg) x (50 km/h) + (700 kg) x (25 km/h), and the total mass is 900 kg + 700 kg. Dividing the total momentum by the total mass gives us the common speed of the coupled cars, which is 40 km/h.
To calculate the loss in kinetic energy, we can use the formula for kinetic energy, which is given by (1/2) x mass x velocity^2. We can calculate the initial kinetic energy of each car and then find the difference between the initial kinetic energy and the final kinetic energy of the coupled cars.
The initial kinetic energy of the 900-kg car is (1/2) x (900 kg) x (50 km/h)^2, and the initial kinetic energy of the 700-kg car is (1/2) x (700 kg) x (25 km/h)^2. The final kinetic energy of the coupled cars is (1/2) x (1600 kg) x (40 km/h)^2. By subtracting the final kinetic energy from the sum of the initial kinetic energies, we can find the loss in kinetic energy, which amounts to 175,000 J.
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Red meat prices rise in the presence of droughts due to animal feeds hike in prices. A spring with a force constant of 490 N/m is used on a scale for weighing meat. The cost of meat is R7.50/kg. 1.5.1. What mass of meat would stretch the spring by 20 cm from its origin? 1.5.2. How much price, P, will a consumer pay for that meat?
1.5.1. The mass of meat that would stretch the spring by 20 cm from its origin is -10 kg.
1.5.2. The consumer will have to pay Rs.75 for the meat.
1.5.1. To determine the mass of meat that would stretch the spring by 20 cm from its origin, we can use Hooke’s law, which states that the force needed to extend or compress a spring by some distance x is proportional to that distance. This can be expressed mathematically as follows:
F = -kx
Where F is the force, k is the spring constant, and x is the displacement of the spring from its original position. The negative sign indicates that the force is in the opposite direction of the displacement.
To find the mass of meat that would stretch the spring by 20 cm from its origin, we need to solve for F and then divide by the acceleration due to gravity, g:
F = -kx
F = -(490 N/m)(0.2 m)
F = -98 N
Next, we can use Newton's second law, which states that the force acting on an object is equal to its mass times its acceleration:
F = ma
Where F is the force, m is the mass, and a is the acceleration. Rearranging the equation to solve for m, we get:
m = F/a
We can use the acceleration due to gravity, g, which is 9.81 m/s²:
m = F/g
a = 9.81 m/s²
m = -98 N/9.81 m/s²
m = -10 kg
This is the mass of meat that would stretch the spring by 20 cm from its origin.
1.5.2. To find the price a consumer would pay for that meat, we need to multiply the mass of the meat by the cost per kilogram:
Price = (mass of meat) x (cost per kilogram)
Price = (10 kg) x (R7.50/kg)
Price = R75
Therefore, the consumer would pay R75 for the meat.
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A neodymium magnet creates a force of 39.2 N on a piece of steel at a separation of 5.50 mm between the center of the magnet and the piece of steel. With what force in newtons would the magnet pull on the steel at a separation 11.5 mm to two significant digits?
Neodymium magnet and steel are two different types of materials having different properties. Neodymium magnet is a permanent magnet made of an alloy of neodymium, iron, and boron and is very strong
In this context, the force of a neodymium magnet on a piece of steel is given to be 39.2 N at a separation of 5.50 mm between the center of the magnet and the piece of steel.
To find the force with which the magnet would pull on the steel at a separation of 11.5 mm, the inverse square law of magnetism is used. The inverse square law of magnetism states that the magnetic force between two magnets or a magnet and a magnetic material is inversely proportional to the square of the distance between them. The force on the steel is given by:
[tex]F = (F0 × d0^2) / d^2[/tex]
Where F is the force on the steel at a separation d from the magnet, F0 is the initial force on the steel at separation d0, which is 5.50 mm in this case.
So, [tex]F = (39.2 × 5.50^2) / 11.5^2 = 14.69 N[/tex]
Therefore, the force with which the neodymium magnet would pull on the steel at a separation of 11.5 mm to two significant digits is 14.69 N.
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Sound waves travel through air at a speed of 330 m/s. A whistle blast at a frequency of about 1.2kHz lasts for 2.5 s. [10] (a) Over what distance in space does the "wave train" representing the sound extend? (b) What is the wavelength of the sound? (c) Estimate the precision with which an observer could measure the wavelength. (d) Estimate the precision with which an observer could measure the frequency.
The distance covered by the "wave train" representing the sound is 825 meters, the wavelength of the sound is 0.275 meters, the precision of measuring the wavelength is approximately 0.001 meters, and the precision of measuring the frequency is limited by the precision of time measurement, typically on the order of milliseconds or microseconds.
(a) The distance covered by the "wave train" can be calculated using the formula: distance = speed * time. In this case, the speed of sound is 330 m/s and the time is 2.5 s, so the distance covered is 330 m/s * 2.5 s = 825 meters.
(b) The wavelength of the sound can be calculated using the formula: wavelength = speed / frequency. The speed of sound is 330 m/s and the frequency is 1.2 kHz, which is equivalent to 1.2 * 10^3 Hz. Therefore, the wavelength is 330 m/s / (1.2 * 10^3 Hz) = 0.275 meters.
(c) The precision with which an observer could measure the wavelength depends on various factors, including the observer's equipment and measurement techniques. Generally, the precision of measurement can be estimated to be on the order of a fraction of the wavelength. In this case, a reasonable estimation could be around 0.001 meters.
(d) The precision with which an observer could measure the frequency is related to the precision of the time measurement. Since the whistle blast lasts for 2.5 seconds, the precision of the frequency measurement would be limited by the precision of time measurement, which could typically be on the order of milliseconds or microseconds.
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Three point charges are arranged as shown in the figure below. Find the magnitude and direction of the electric force on the particle
q = 5.20 nC
at the origin. (Let
r12 = 0.250 m.)
magnitude N
direction ° counterclockwise from the +x axis
Three point charges lie along the axes in the x y coordinate plane.
Positive charge q is at the origin.
A charge of 6.00 nC is at (r1 2, 0), where r1 2 > 0.
A charge of −3.00 nC is at (0, −0.100 m).
The magnitude of force acting on the charge q is 124902 N and it acts at an angle of 270° counterclockwise from the +x axis. Charge q = 5.20 nC, Distance r12 = 0.250 m, Charge q1 = 6.00 nC, Charge q2 = -3.00 nC.
The distance between charges is not mentioned here.
The electric force formula is:F= k * (|q1*q2|) / r^2F = forcek = Coulomb's constantq1 and q2 = charges , r = distance between charges.
Magnitude of electric force (F) between two charges is given by:
F= k * (|q1*q2|) / r^2F = 9 × [tex]10^9[/tex] N·m²/C² q1 = 5.20 nC q2 = 6.00 nC q3 = -3.00 nC.
The total force acting on charge q = F1 + F2 + F3.
We need to find F1, F2 and F3 using Coulomb's law.
The force between charge q and charge q1F1 = k * q * q1 / r^2Here r^2 = (0.25)²F1 = 9 × [tex]10^9[/tex] * 5.20 * 6.00 / (0.25)²F1 = 112.32
NF1 acts at an angle of θ1 with respect to x-axisθ1 = tan⁻¹(y/x)θ1 = tan⁻¹(0/0.25)θ1 = 0°.
The force between charge q and charge q2F2 = k * q * q2 / r^2Here r^2 = (0.1)²F2 = 9 × [tex]10^9[/tex] * 5.20 * (-3.00) / (0.1)²F2 = -88248 N.
The force F2 acts along y-axisθ2 = 270°.
The force between charge q and charge q3F3 = k * q * q3 / r^2Here r^2 = (0.1)²F3 = 9 × [tex]10^9[/tex] * 5.20 * (-3.00) / (0.1)²F3 = -88248
NF3 acts along x-axisθ3 = 180°.
Now we need to calculate the net force on the charge q Net force,
FNet = F1 + F2 + F3FNet = 112.32 - 88248 i - 88248 j.
The magnitude of net force is given by Magnitude, FNet= √(FNetx² + FNety²)FNet= √(112.32² + (-88248)² + (-88248)²)FNet= 124902 N (Approx).
The direction of force is given byθ= tan⁻¹(FNety/FNetx)θ= tan⁻¹((-88248) / 112.32)θ= 270° (Approx).
So, the magnitude of force acting on the charge q is 124902 N and it acts at an angle of 270° counterclockwise from the +x axis.
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Question 6: Determine the magnitude and direction of the resultant force with the forces of 45N and 70N acting at an angle of 30 degrees to each other. . 1 mark for drawing a vector diagram of this situation, determining the magnitude and the angle of the resultant (out of 3) 1 mark for the therefore statement . Vector Diagram Magnitude of the Resultant: Angle of the Resultant: Therefore, Question 7: A motorcycle stunt person leaves the jump ramp travelling at 25m/s at 25 degrees to the horizontal. a) Draw a vector diagram, which represents the rectangular components. b) Use Vector Resolution to find the magnitudes of each components. . 1 mark to draw the diagram 2 marks for demining each of the x-component and the y-component of 4) Diagram: X-Component (Horizontal) y-Component (Vertical)
Question 6:To determine the magnitude and direction of the resultant force, we should first sketch a vector diagram of the forces and calculate the magnitude and angle of the resultant.
Fig 1: Vector diagramMagnitude of the Resultant:The Pythagorean theorem is used to calculate the magnitude of the resultant force.The Pythagorean theorem is a² + b² = c², where c is the hypotenuse, a is the adjacent, and b is the opposite.In this case,a = 45N, and b = 70N.45² + 70² = c²c = √(45² + 70²)c = 83.10 N approximatelyTherefore, the magnitude of the resultant force is 83.10 N.Angle of the Resultant:The tangent of an angle is defined as the ratio of the opposite side to the adjacent side of a right triangle.For the given problem,θ = tan⁻¹(70/45)θ = 56.31° approximatelyTherefore, the angle between the resultant force and the 45 N force is 56.31°.Therefore Statement:The resultant force's magnitude is 83.10 N, and it acts at an angle of 56.31° with the 45 N force.Question 7:a) Diagram:The angle between the horizontal and the ramp is 25°, so the angle between the horizontal and the motorcycle's velocity is 90 - 25 = 65°.Fig 2: Diagram for Vector Diagramb) X-Component (Horizontal):The x-component of velocity can be calculated as follows:Vx = V cosθwhere V = 25 m/s and θ = 65°Vx = 25 cos 65°Vx = 10.59 m/sc) Y-Component (Vertical):The y-component of velocity can be calculated as follows:Vy = V sinθwhere V = 25 m/s and θ = 25°Vy = 25 sin 25°Vy = 10.72 m/sTherefore, the rectangular components are as follows:Fig 3: Vector Components DiagramThe x-component of the velocity is 10.59 m/s, and the y-component of the velocity is 10.72 m/s.
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What is the sound intensity level of a sound with an intensity of \( 9 \times 10^{-4} \) \( \mathrm{W} / \mathrm{m}^{2} \) ? \( \mathrm{dB} \) Question Help: \( \square \) Message instructor
The sound intensity level of the sound with an intensity of \(9 \times 10^{-4}\) W/m² is 80 dB. The sound intensity level (L) is calculated using the formula:
\[ L = 10 \log_{10}\left(\frac{I}{I_0}\right) \]
where \(I\) is the sound intensity and \(I_0\) is the reference intensity, which is typically set at \(10^{-12}\) W/m².
Substituting the given values into the formula:
\[ L = 10 \log_{10}\left(\frac{9 \times 10^{-4}}{10^{-12}}\right) \]
Simplifying:
\[ L = 10 \log_{10}\left(9 \times 10^{8}\right) \]
\[ L = 10 \times 8 \]
\[ L = 80 \, \mathrm{dB} \]
Therefore, the sound intensity level of the sound with an intensity of \(9 \times 10^{-4}\) W/m² is 80 dB.
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A Carnot engine takes 15,000 J from a heat reservoir at a high temperature and rejects 8500 J to a heat reservoir at a cooler temperature. Determine the efficiency of the motor. a. 0.57 b. 0.30 c. 0.43 d. 0.23
A Carnot engine takes 15,000 J from a heat reservoir at a high temperature:The efficiency of the Carnot engine is 0.43. The correct option is c.
The efficiency of a heat engine is defined as the ratio of the useful work output to the heat input. In the case of a Carnot engine, the efficiency (η) is given by the equation:
η = 1 - (Qc / Qh),
where Qh is the heat input from the high-temperature reservoir and Qc is the heat rejected to the low-temperature reservoir.
In this problem, the heat input (Qh) is given as 15,000 J, and the heat rejected (Qc) is given as 8,500 J.
Substituting these values into the efficiency equation:
η = 1 - (8500 J / 15000 J),
η = 1 - 0.57,
η = 0.43.
Therefore, the efficiency of the Carnot engine is 0.43 (option c). This means that 43% of the heat input is converted into useful work, while 57% is lost as waste heat. The correct option is c.
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Starting at rest at the edge of a swimming pool, a 62.0 kgkg athlete swims along the surface of the water and reaches a speed of 1.15 m/sm/s by doing the work Wnc1Wnc1W_1 = 171 JJ .
Find the nonconservative work, Wnc2Wnc2, done by the water on the athlete
The non-conservative work done by the water on the athlete is 211.9975 J. To find the nonconservative work done by the water on the athlete, we can use the work-energy principle.
The nonconservative work done by the water on the athlete is equal to the total work done by the athlete, minus the conservative work done by the athlete. The conservative work done by the athlete is the work done by the athlete's muscles, and it is equal to the change in the kinetic energy of the athlete.
So, the nonconservative work done by the water on the athlete is:
Wnc2 = Wnc1 + K_f - K_i
where:
Wnc2 is the nonconservative work done by the water on the athlete
Wnc1 is the conservative work done by the athlete
K_f is the final kinetic energy of the athlete
K_i is the initial kinetic energy of the athlete
Substituting the values, we get:
Wnc2 = 171 J + 1/2 * 62.0 kg * (1.15 m/s)^2 - 1/2 * 62.0 kg * 0 m/s^2 = 211.9975 J
Therefore, the nonconservative work done by the water on the athlete is 211.9975 J.
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The sound sources A, B, and C emit sounds. The rates of energy emission are: PA = 500 W, PB = 750 W, and PC = 1000 W. An observer sits 1.0 m from A, 2.0 m from B and 3.0 m from C. Rate the intensities from loudest to softest that the observer hears.
The intensities, from loudest to softest, that the observer hears are: PC > PB > PA.
The intensity of a sound wave is the power per unit area carried by the wave. It is directly proportional to the square of the amplitude of the wave. In this scenario, the observer is located at different distances from the sound sources A, B, and C, and the rates of energy emission from each source are given.
Since intensity decreases with distance, the observer will hear the loudest sound from the source that is closest to them. In this case, the observer is 1.0 m from source A, 2.0 m from source B, and 3.0 m from source C.
As the distance increases, the intensity decreases according to the inverse square law. Therefore, the intensity will be highest for source C, followed by source B, and then source A. This means that the observer will hear the sound from source C as the loudest, followed by source B, and finally source A as the softest.
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14. The speed of sound in a medium is v=1400 m/sec, and it's density is rho=100 kg/m. Based on this information, what should the bulk modulus be for this material? (Pa=kg/(m*sec^2)) A. 1,960,000,000 Pa B. 196,000,000 Pa C. 37,416.574 Pa D. 3741.657 Pa
3. An object undergoes motion in 2 dimensions under a constant acceleration of a = 2.50 m/s at an angle of 50.0° with respect to the + x direction. It also has an initial velocity of v = 7.00 m/s at an angle of 10.0°. The object begins at the coordinates (0,0). a) What are the coordinates of the object at t= 7.00 s? b) What is its total velocity vector of the object as a magnitude and direction at t= 7.00 s? c) What is the total displacement vector of the object as a magnitude and direction when its velocity in the y-direction is 15.0 m/s j? d) What is the velocity of the object as a magnitude and direction upon moving 30,0 m in the x direction?
Coordinates: (14.69 m, 7.33 m)
Velocity: 9.22 m/s, 24.9°
a) To find the coordinates of the object at t = 7.00 s, we need to use the equations of motion in two dimensions. The object undergoes motion with constant acceleration, so we can use the following equations:
x = x0 + v0xt + (1/2)axt^2
y = y0 + v0yt + (1/2)ayt^2
where x and y are the final coordinates, x0 and y0 are the initial coordinates (0, 0), v0x and v0y are the initial velocities in the x and y directions, a is the acceleration, and t is the time.
Given:
a = 2.50 m/s^2
θ = 50.0° (angle with respect to +x direction)
v0 = 7.00 m/s
φ = 10.0° (angle of initial velocity)
First, we need to break down the initial velocity vector into its x and y components:
v0x = v0 * cos(φ)
v0y = v0 * sin(φ)
Using these values, we can calculate the x and y coordinates at t = 7.00 s:
x = x0 + v0x * t + (1/2) * ax * t^2
= 0 + (7.00 * cos(10.0°)) * 7.00 + (1/2) * 2.50 * (7.00)^2
y = y0 + v0y * t + (1/2) * ay * t^2
= 0 + (7.00 * sin(10.0°)) * 7.00 + (1/2) * 2.50 * (7.00)^2
Evaluating these expressions will give us the x and y coordinates of the object at t = 7.00 s.
b) To find the total velocity vector of the object at t = 7.00 s, we need to combine the x and y components of the initial velocity and the acceleration.
The x component of the velocity is given by:
vx = v0x + a * t
The y component of the velocity is given by:
vy = v0y + a * t
The magnitude of the total velocity vector is given by the Pythagorean theorem:
v = sqrt(vx^2 + vy^2)
The direction of the total velocity vector can be found using trigonometry:
θ_v = arctan(vy / vx)
By substituting the given values and evaluating these equations, we can find the magnitude and direction of the total velocity vector.
c) To find the total displacement vector of the object when its velocity in the y-direction is 15.0 m/s (j), we need to consider that the object is still accelerating.
We know that the acceleration in the y-direction is ay = a * sin(θ) and the acceleration in the x-direction is ax = a * cos(θ).
We can use the equation of motion to find the time when the velocity in the y-direction is 15.0 m/s:
vy = v0y + a * t
15.0 = v0 * sin(φ) + a * sin(θ) * t
Rearranging the equation, we can solve for t:
t = (15.0 - v0 * sin(φ)) / (a * sin(θ))
Once we have the time, we can substitute it into the equations of motion to find the x and y displacements:
x = x0 + v0x * t + (1/2) * ax *
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You look directly down through the flat surface of some water and see a fish. You estimate the fish to be 0.35m beneath the surface of the water. You are looking down through air (n=1.00) and you know water has an index of refraction around 1.33. How far beneath the surface of the water is the fish? (Answer in meters to 2 decimal places.)
The fish is located approximately 0.28 meters beneath the surface of the water.
When light travels from one medium to another, it changes direction due to the difference in refractive indices between the two mediums. In this case, as you are looking down through air and then water, the light rays will bend as they pass from air (n = 1.00) to water (n = 1.33).
The apparent depth is the depth at which an object appears to be located when viewed through a different medium. By applying Snell's law, which relates the angles and refractive indices of light, we can calculate the apparent depth.
Let's assume the actual depth of the fish is h, and the apparent depth is h'. According to Snell's law, the ratio of the sine of the angle of incidence (in air) to the sine of the angle of refraction (in water) is equal to the ratio of the refractive indices: sin(angle of incidence) / sin(angle of refraction) = n_air / n_water.
In this case, the angle of incidence is 90 degrees (since you are looking directly down) and the angle of refraction can be determined using the refractive indices of air and water. Therefore, sin(90 degrees) / sin(angle of refraction) = 1.00 / 1.33.
Solving for sin(angle of refraction), we find sin(angle of refraction) = 1.00 / 1.33, which gives us an angle of refraction of approximately 49.59 degrees.
Using trigonometry, we can now determine the apparent depth: sin(angle of refraction) =[tex]\frac{ h' }{ (h + h')}[/tex] . Plugging in the known values, we have sin(49.59 degrees) = /[tex]\frac{ h' }{ (h + h')}[/tex].
Simplifying the equation, we find that h' = (h + h') * sin(49.59 degrees). Rearranging the equation, we get h' - h' * sin(49.59 degrees) = h * sin(49.59 degrees).
Now we can solve for h, the actual depth of the fish. Rearranging the equation further, we have h = [tex]\frac{h'}{(1 - sin(49.59 degrees)}[/tex]). Plugging in the known value for h', which is 0.35 meters, we can calculate h as follows:
h = [tex]\frac{0.35}{(1 - sin(49.59 degrees))}[/tex] ≈ 0.28 meters.
Therefore, the fish is located approximately 0.28 meters beneath the surface of the water.
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You shine light from a 640 nm laser onto a single slit of width 0.150 mm that is
placed in front of a screen. You measure the distance on the screen between the
second minima on either side of the central bright spot, and you find them to be 2.20
cm apart. How far away is the screen?
To determine the distance to the screen, we can use the concept of diffraction and the single-slit equation:
d*sin(θ) = m*λ,
where d is the width of the slit, θ is the angle of diffraction, m is the order of the minima, and λ is the wavelength of the light.
In this case, we are interested in the second minima, so m = 2. We know the wavelength of the light is 640 nm, which is equal to 640 x 10^(-9) m.
We are given the distance between the second minima on either side of the central bright spot, which is 2.20 cm. To find the angle of diffraction, we can use the small angle approximation:
θ ≈ (y/L),
where y is the distance between the second minima and L is the distance to the screen.
Rearranging the equation, we have:
L ≈ y / θ = y / (d*sin(θ)).
Substituting the given values, we have:
L ≈ (2.20 cm) / (0.150 mm * sin(θ)).
Now, we need to find the value of sin(θ). Since θ is small, we can approximate sin(θ) as θ:
L ≈ (2.20 cm) / (0.150 mm * θ).
Finally, substituting the approximate value of sin(θ) as θ, we can calculate the distance to the screen:
L ≈ (2.20 cm) / (0.150 mm * (2.20 cm / L)).
Simplifying the equation, we find:
L ≈ (2.20 cm)² / (0.150 mm * 2.20).
Evaluating this expression, we get:
L ≈ 32.53 cm.
Therefore, the distance to the screen is approximately 32.53 cm.
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