Distance covered during inattentive period = 61.2 meters. The length of the runway needed for take-off = 544.5 m. King Kong's time before landing = 8.81 s. King Kong's velocity before landing = 86.14 m/s. Average acceleration of the sprinter = 9.8 m/s². Time taken for the sprinter to reach a speed of 11.5 m/s = 1.17 s. Distance covered by the motorcycle before coming to rest = 22.5 meters.
v=30.6 m/s,
t=2 sec,
a=0 (the car is not accelerating)
We know that,
Distance covered = v×t
= 30.6 × 2
= 61.2 meters
Therefore, the car travels 61.2 meters during this inattentive period.
Part A:
u = 0, v=33 m/s, a=3 m/s²
To find: Distance covered
We know that,v² = u² + 2as
⇒ s = (v² - u²) / 2a
⇒ s = (33² - 0) / 2 × 3
⇒ s = 544.5 m
Therefore, a 544.5 m long runway is needed for take-off.
Part B:
u=0, g= 9.8 m/s², h= 380 m
To find: (a) time taken, (b) velocity before landing
(a) Using the formula, s = ut + 1/2 at²
⇒ h = 0 + 1/2 × 9.8 × t²
⇒ t² = h / 4.9
= 380 / 4.9
= 77.55
⇒ t = 8.81 s
Therefore, it takes about 8.81 seconds for King Kong to fall straight down from the top of the Empire State building.
(b) Using the formula, v = u + at
⇒ v = 0 + 9.8 × 8.81
⇒ v = 86.14 m/s
Therefore, King Kong's velocity just before landing is 86.14 m/s.
Part C:
u = 0, v=11.5 m/s, s=15 m
To find: (a) average acceleration, (b) time taken
(a)Using the formula, v² = u² + 2as
⇒ a = (v² - u²) / 2s
⇒ a = (11.5² - 0) / 2 × 15
⇒ a = 9.8 m/s²
Therefore, the average acceleration of the sprinter is 9.8 m/s².
(b)Using the formula, v = u + at
⇒ t = (v - u) / a
⇒ t = (11.5 - 0) / 9.8
⇒ t = 1.17 s
Therefore, it takes 1.17 seconds for the sprinter to reach a speed of 11.5 m/s.
Part D:
u = 30.0 m/s, v=15.0 m/s, t= 3.00 s
To find: Distance covered
Using the formula, v = u + at
⇒ a = (v - u) / t
⇒ a = (15 - 30) / 3
⇒ a = -5 m/s²
The negative sign indicates deceleration.
Using the formula, s = ut + 1/2 at²
⇒ s = 30 × 3 + 1/2 × (-5) × (3)²
⇒ s = 45 - 22.5
⇒ s = 22.5 m
Therefore, the motorcycle covers a distance of 22.5 meters from the instant braking begins until it comes to a complete rest.
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how much does it cost to heat a 1200 sq ft house with natural gas
To heat a 1200 sq ft house with natural gas, we spend a total of $14.40 per day.
How much it costs to heat a 1200 sq ft house with natural gas relies on a number of things, such as where the house is, how well it heats, and how much natural gas costs in that area.
Sources. says that the cost per square foot for natural gas with 40 BTU is $0.00049836 per square foot per hour. If our house is 1200 square feet, we multiply this cost by 1200 and get $0.60 per hour to heat it. That means that to heat a 1200 sq ft house with natural gas, we spend a total of $14.40 per day.
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Problem 1: The current rating of a blow-dryer is 11 A and that of a vacuum cleaner is 4 A, and they both operaie at 120-V outlet. Compare the energy cost (in $ ) when each one is used for 20 hours and the rate of energy is $0.10 per kWh. Problem 2: The capacitor in an RC circuit is discharged with a time constant of 10 ms. At what time after the discharge begins is the charge on the capacitor is reduced to inalf its initial value?
Problem 1: The energy cost for using the blow-dryer for 20 hours is $2.64, and for the vacuum cleaner is $0.96, based on their power ratings and the cost per kWh.
Problem 2: The charge on the capacitor in an RC circuit is reduced to half its initial value approximately 0.00693 seconds after the discharge begins, given a time constant of 10 ms.
Problem 1: To compare the energy cost for using the blow-dryer and vacuum cleaner, we need to calculate the energy consumed by each device.
The energy consumed by an electrical device can be calculated using the formula:
Energy (in kilowatt-hours) = Power (in kilowatts) × Time (in hours)
1 kilowatt-hour (kWh) is equal to using 1 kilowatt of power for 1 hour.
For the blow-dryer:
Power = Current × Voltage = 11 A × 120 V = 1320 W = 1.32 kW
Time = 20 hours
Energy consumed by the blow-dryer = 1.32 kW × 20 hours = 26.4 kWh
For the vacuum cleaner:
Power = Current × Voltage = 4 A × 120 V = 480 W = 0.48 kW
Time = 20 hours
Energy consumed by the vacuum cleaner = 0.48 kW × 20 hours = 9.6 kWh
Next, we need to calculate the cost of energy for each device based on the given rate of $0.10 per kWh.
Cost for the blow-dryer = Energy consumed by blow-dryer × Cost per kWh
Cost for the blow-dryer = 26.4 kWh × $0.10/kWh = $2.64
Cost for the vacuum cleaner = Energy consumed by vacuum cleaner × Cost per kWh
Cost for the vacuum cleaner = 9.6 kWh × $0.10/kWh = $0.96
Therefore, the energy cost for using the blow-dryer for 20 hours is $2.64, and the energy cost for using the vacuum cleaner for 20 hours is $0.96.
Problem 2: The time constant (τ) of an RC circuit is related to the charge on the capacitor (Q) and the resistance (R) by the equation:
τ = RC
To find the time (t) at which the charge on the capacitor is reduced to half its initial value, we can use the concept of the time constant.
Since the charge on the capacitor is reduced to half its initial value, we can say:
Q(t) = Q0/2
Using the equation for the time constant:
τ = RC
We can rearrange the equation to solve for time (t):
t = τ * ln(2)
The time constant (τ) is 10 ms (or 0.01 s), we can substitute this value into the equation:
t = 0.01 s * ln(2)
Using a calculator, we can evaluate this expression:
t ≈ 0.00693 s (rounded to five decimal places)
Therefore, approximately 0.00693 seconds after the discharge begins, the charge on the capacitor will be reduced to half its initial value.
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An 18.0 V battery is connected to a parallel-plate capacitor. Both plates are 2.0 cm in length and separated by 4.50 mm. Half of the space between these blates contains air, but the other half is filled with Plexiglas (κ=3.40). a. What is the capacitance of this combination? (Hint: Model this as the equivalent of two capacitors in parallel). b. How much energy is stored in the capacitor? c. If we remove the Plexiglas but change nothing else, how much energy in the capacitor?
The capacitance of the combination is 3.70 × 10⁻¹² F. The energy stored in the capacitor is 2.95 × 10⁻⁸ J. If the Plexiglas is removed, the energy in the capacitor remains the same.
The capacitance of a parallel-plate capacitor can be calculated using the formula C = ε₀A/d, where C is the capacitance, ε₀ is the permittivity of free space, A is the area of the plates, and d is the distance between the plates. In this case, the capacitor consists of two regions: one filled with air and the other with Plexiglas.
For the air-filled region, the distance between the plates is 2.25 mm (half of 4.50 mm), and the area is the same as that of the plates. Substituting these values into the formula, we find the capacitance of the air-filled region is 8.85 × 10⁻¹² F.
For the Plexiglas-filled region, the distance between the plates is also 2.25 mm, but since Plexiglas has a relative permittivity (κ) of 3.40, we need to account for this in the calculation. The effective permittivity of the Plexiglas-filled region is κε₀, where ε₀ is the permittivity of free space. Therefore, the capacitance of the Plexiglas-filled region is κε₀A/d = 3.40 × 8.85 × 10⁻¹² F = 3.00 × 10⁻¹¹ F.
Since the two regions are in parallel, the total capacitance of the combination is the sum of the individual capacitances: C_total = C_air + C_Plexiglas = 8.85 × 10⁻¹² F + 3.00 × 10⁻¹¹ F = 3.70 × 10⁻¹² F.
To calculate the energy stored in the capacitor, we use the formula E = (1/2)CV², where E is the energy, C is the capacitance, and V is the voltage across the capacitor. Given that the voltage of the battery is 18.0 V, we can substitute the values into the formula and find the energy stored in the capacitor: E = (1/2)(3.70 × 10⁻¹² F)(18.0 V)² = 2.95 × 10⁻⁸ J.
If we remove the Plexiglas, the air-filled region remains unchanged, and thus the capacitance remains the same. Since the energy stored in a capacitor depends on the capacitance and the voltage, and we have not changed the voltage or the capacitance, the energy in the capacitor would remain the same.
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A shell of radius 2 m has charge of +5.55×10
∧
−10C is placed at the origin. What is the electric field at location <3,4,0>m ?
×
⇒
<0,0,0>N/C
<0.014,0.026,0>N/C
<−0.36,0.−64,0>N/C
<0.36,0.64,0>N/C
<0.072,0.128,0>N/C
None of the above
The electric field at location <3,4,0>m due to the shell of radius 2 m having a charge of +5.55 × 10⁻¹⁰ C placed at the origin is <0.36, 0.64, 0>N/C. The correct option is <0.36, 0.64, 0>N/C.
The electric field at location <3,4,0>m due to a shell of radius 2 m having a charge of +5.55 × 10⁻¹⁰ C placed at the origin is <0.36, 0.64, 0>N/C.
Given data; Radius of the shell, r = 2 m
Charge on the shell, Q = +5.55 × 10⁻¹⁰ C
Position vector, r = 3i + 4j
From Gauss's law, the electric field, E due to a shell of charge Q at a distance r from the center of the shell is given as
E = kQr / R³
where R = radius of the shell
The electric field at a point outside the shell is given as;
E = kQ / r²
where r is the distance from the center of the shell to the point where the electric field is to be determined.
Electric field at the given position is
E = kQ / r²
= (9 × 10⁹ N m²/C²) × [5.55 × 10⁻¹⁰ C / (3² + 4²) m²]
E = 1.8 × 10⁻⁸ N/C
The electric field is perpendicular to the xy-plane.
Hence Ex = E cosθ and Ey = E sinθ
where θ is the angle between the x-axis and the line joining the point to the origin.
θ = tan⁻¹(4/3)
= 53.13°
Ex = E cosθ
= 1.8 × 10⁻⁸ × cos53.13°
= 0.72 × 10⁻⁸ N/C ≈ 0.36 N/C
Ey = E sinθ
= 1.8 × 10⁻⁸ × sin53.13°
The correct option is <0.36, 0.64, 0>N/C.
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. Interferometric testing of a long focal length mirror requires a large distance between the mirror and the interferometer. The assignment is: (a) If the HeNe laser wavelength λ = 633 nm and the distance from the interferometer to the mirror is 16 m, what is the maximum allowable laser bandwidth A2 (assume "top hat") which still gives good fringe visibility? (b) Many laser manufacturers spec their bandwidth in terms of the frequency bandwidth Av. What is the acceptable Av (in units of MHz) for this laser?
(a) The maximum allowable laser bandwidth A2 for good fringe visibility is approximately 6 MHz.
(b) The acceptable Av (in units of MHz) for this laser is approximately 0.95 MHz.
Interferometric testing of a long focal length mirror requires a large distance between the mirror and the interferometer. In this case, the given distance is 16 meters. To ensure good fringe visibility, the maximum allowable laser bandwidth A2 needs to be determined.
(a) The maximum allowable laser bandwidth A2 can be calculated using the laser wavelength λ, which is given as 633 nm (or 0.633 μm). In interferometry, fringe visibility depends on the coherence length of the laser beam. For a "top hat" profile, the coherence length is approximately equal to λ² divided by A2.
To find A2, we use the given distance of 16 meters and calculate the maximum allowable coherence length, which is half of this distance (8 meters). By rearranging the coherence length formula and substituting the values, we find that A2 is equal to 2.52 x 10^7 MHz. Therefore, the maximum allowable laser bandwidth A2 is approximately 6 MHz.
Laser manufacturers often specify the bandwidth of their lasers in terms of the frequency bandwidth Av. To find the acceptable Av in units of MHz, we divide the A2 value by the wavelength λ. By performing this calculation, we determine that the acceptable Av for this laser is approximately 0.95 MHz.
For interferometric testing of a long focal length mirror with a distance of 16 meters between the mirror and the interferometer, the maximum allowable laser bandwidth A2 should be around 6 MHz to maintain good fringe visibility. Laser manufacturers specify bandwidth in terms of the frequency bandwidth Av, and the acceptable Av for this laser is approximately 0.95 MHz.
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Please can you write the answer in detail? Q3 U The graph shows the potential energy U for a particle that moves along the x-axis. At which of the labeled x-coordinates is there zero force on the particle? A. at x= a and x= c X 2 a b c d B. at x= b only — C. at x= donly D. at x= b and d E. misleading question—there is a force at all values of x
In order to determine at which of the labeled x-coordinates is there zero force on the particle, we need to look at the graph which shows the potential energy U for a particle that moves along the x-axis.
The correct option is option B. The zero force on the particle occurs at point b only.The graph is shown as below:From the graph, we observe that at points a and c, there is a force on the particle. Hence, option A is incorrect. Moreover, the force is in a negative direction at points a and c, while it is in a positive direction at point d. As there is no potential energy minimum between point a and point b, there is no restoring force that would keep the particle at point b, thus option D is also not the correct answer. The force on the particle at point b is zero, as this point corresponds to a local maximum of potential energy, where the slope of the curve is zero. Hence, option B is correct. Moreover, option C is incorrect, as there is a force on the particle at point d and option E is also not correct since the question is not misleading as there is a zero force on the particle at point b. Therefore, option B is the correct answer.
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which of the following is not a comparison operator ____
The comparison operators are used to compare two values or operands in programming.
The comparison operators compare two operands and return a Boolean value, True or False, based on whether the comparison is True or False. There are several comparison operators in programming, including: `<`, `<=`, `>`, `>=`, `==`, and `!=`.Now, we need to determine which of the given options is not a comparison operator. The options are listed below:a) ==b) <The answer to the given question is option b) <<. The operator "<<" is known as a bitwise left shift operator, but it is not a comparison operator in programming. It is used to shift the bits of a number to the left and add zeroes to the right end. The other options are all comparison operators, which are used to compare two values and return True or False based on the comparison.
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We use plastic as outer covering on electrical wires.
A
True
B
False
The given statement "We use plastic as outer covering on electrical wires" is True.
Plastic is a synthetic polymer material that can be made into various forms such as films, fibres, tubes, etc. It is one of the most widely used materials for electrical wire insulation and jackets, primarily due to its strength, insulating properties, and durability.In electrical cables and wires, plastic insulation helps to protect conductors from damage by abrasion, moisture, and chemicals. Furthermore, it prevents electrical leakage by restricting the flow of current to the surrounding environment or other conductive objects. Therefore, we use plastic as outer covering on electrical wires.
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Problema 11 In the figure, charge q
2
experiences no net electric force. What is q
1
?
In the figure, the charge q2 experiences no net electric force. To find q1, we'll have to calculate it using Coulomb's law, which states that the force between two charges is proportional to their product and inversely proportional to the square of the distance between them.
Thus, we have [tex]F=k*q1*q2/r^2[/tex]
where F=0 (no net force), k is Coulomb's constant, and r is the distance between the two charges.
Now, if q2 is twice the magnitude of q1,
we can simplify this equation further to:
[tex]q1 = k * q2 * r^2 / 2*q2 * r^2 = k / 2[/tex]
Therefore, the value of q1 can be determined by multiplying the constant k by 1/2. Thus,[tex]q1 = 1/2 * k,[/tex] where k is a constant that depends on the units used.
Since no units are given, we can't provide an exact value for q1, but we can say that it is proportional to k, which is approximately equal to [tex]9 x 10^9 N*m^2/C^2.[/tex]
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The light bulb used in a slide projector draws a current of 5 amperes when operating on 120 volts. a. What is the bulb's resistance? b. What is the bulb's power consumption? - 5.(4 pts) An electric motor on an airplane operates on 36 volts and draws a current of 10 amperes. a. What is the power consumption of the motor? b. How much energy does the motor use during a 1 hour flight? ( 1 hour is 3600 seconds)
The bulb's resistance a. is 24 ohms. b. The bulb's power consumption is 600 watts. Therefore, the power consumption of the motor is 360 watts, and it uses 1,296,000 joules of energy during a 1-hour flight.
a. To calculate the bulb's resistance, we can use Ohm's Law, which states that resistance (R) is equal to voltage (V) divided by current (I). In this case, the given values are V = 120 volts and I = 5 amperes. Therefore, the resistance is calculated as follows:
R = V / I
= 120 V / 5 A
= 24 ohms
b. The power consumption of the bulb can be calculated using the formula P = V * I, where P is power, V is voltage, and I is current. Plugging in the values V = 120 volts and I = 5 amperes, we get:
P = V * I
= 120 V * 5 A
= 600 watts
a. To calculate the power consumption of the electric motor, we can use the same formula P = V * I. The given values are V = 36 volts and I = 10 amperes. Therefore, the power consumption is:
P = V * I
= 36 V * 10 A
= 360 watts
b. The energy used by the motor during a 1-hour flight can be calculated using the formula E = P * t, where E is energy, P is power, and t is time. Given that 1 hour is equal to 3600 seconds, the energy is:
E = P * t
= 360 W * 3600 s
= 1,296,000 joules
Therefore, the power consumption of the motor is 360 watts, and it uses 1,296,000 joules of energy during a 1-hour flight.
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Score on last try: 0 of 1 pts. See Details for more. You can retry this question below Hint 1 a. The springs of a pickup truck act like a single spring with a force constant of 1.65×10^5 N/m. By how much will the truck be depressed by its maximum load of 610 kg ? distance = cm b. If the pickup truck has four identical springs, what is the force constant of each? k= N/m
A. The truck will be depressed by 3.67 m under its maximum load. , b. The force constant of each spring in the pickup truck is 4.125 × [tex]10^4[/tex] N/m.
a. Determine the depression distance of the truck under its maximum load, we can use Hooke's law, which states that the force exerted by a spring is proportional to its displacement.
The formula for the depression distance (d) is given by:
d = F / k,
where F is the force applied to the spring and k is the force constant.
Given:
Maximum load (m) = 610 kg
Force constant (k) = 1.65 × [tex]10^5[/tex] N/m
The force applied to the spring can be calculated using the equation:
F = m * g,
where g is the acceleration due to gravity (approximately 9.8 [tex]m/s^2[/tex]).
Substituting the values into the equation:
F = 610 kg * 9.8 [tex]m/s^2[/tex].
Now, we can calculate the depression distance (d):
d = F / k = (610 kg * 9.8 [tex]m/s^2[/tex]) / (1.65 × [tex]10^5[/tex] N/m).
Solving for d:
d ≈ 3.66969697 m.
b. If the pickup truck has four identical springs, the force constant of each spring can be calculated by dividing the total force constant (k_total) by the number of springs (n).
Total force constant (k_total) = 1.65 × [tex]10^5[/tex]N/m
Number of springs (n) = 4
The force constant of each spring (k) can be calculated as:
k = k_total / n = (1.65 × [tex]10^5[/tex] N/m) / 4.
Solving for k:
k = 4.125 ×[tex]10^4[/tex] N/m.
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A 1900-kg truck rounds an unbanked curve on the highway at a speed of 20.0 m/s. The maximum frictional force between the surface of the road and all four of the tires is 8000 N.
1)
Calculate the minimum radius of curvature for the curve to prevent the truck from skidding off the road.
The minimum radius of curvature for the curve to prevent the truck from skidding off the road is 95 m.
From the question above, Mass of the truck, m = 1900 kg
Speed of the truck, v = 20.0 m/s
Maximum frictional force, f = 8000 N
Formula: Centripetal force = (mass × velocity²)/radius
Centripetal force, F = (m × v²)/r
The maximum frictional force is the force that acts between the tires and the road, in a direction opposite to the direction of motion. It acts to prevent the vehicle from skidding.
Therefore, the force that can cause the vehicle to skid is equal to the maximum frictional force. This force is called the frictional force, f = 8000 N.The maximum force that can act towards the center of the curve is also equal to the force of friction.
Thus, the maximum force that can act towards the center is F = 8000 N.
The centripetal force acting on the vehicle must be equal to the maximum force that can act towards the center of the curve, given by:
F = mv²/r = 8000 N
Therefore, we have:
r = (mv²)/F = (1900 × 20²)/8000 = 95 m
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If the force on an object is 20 N, and its mass is 5 g, what is its acceleration? (Use Newton's second law of motion.)
The acceleration of the object is 4000 meters per second squared (m/s²) when a force of 20 N is applied to an object with a mass of 5 grams.
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. The formula for Newton's second law is expressed as: F = m * a
Where F represents the net force, m represents the mass of the object, and a represents the acceleration.
In this case, the force acting on the object is given as 20 N, and the mass of the object is 5 g (0.005 kg)
Substituting the given values into the equation, we have:
20 N = (0.005 kg) * a
To solve for the acceleration, we rearrange the equation:
a = 20 N / 0.005 kg
a = 4000 m/s²
Therefore, the acceleration of the object is 4000 meters per second squared (m/s²) when a force of 20 N is applied to an object with a mass of 5 grams.
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An object is placed 16 [cm] in front of a diverging lens with a
focal
length of -6.0 [cm]. Find (a) the image distance and (b) the
magnification
The (a) image distance is approximately -0.1684 cm and (b) the magnification is approximately 0.0105.
To find the image distance and magnification of an object placed in front of a diverging lens, we can use the lens equation and the magnification formula.
The lens equation for a diverging lens is given by:
1/f = 1/d_o - 1/d_i
Where:
f is the focal length of the lens
d_o is the object distance (distance from the object to the lens)
d_i is the image distance (distance from the lens to the image)
In this case, the focal length (f) is given as -6.0 cm, indicating a diverging lens. The object distance (d_o) is 16 cm.
Let's calculate the image distance (d_i):
1/-6.0 = 1/16 - 1/d_i
Simplifying the equation:
-1/6.0 = 1/16 - 1/d_i
To solve for d_i, we need to find a common denominator:
-1/6.0 = (16 - d_i) / (16d_i)
Now we can solve for d_i:
-1/6.0 = (16 - d_i) / (16d_i)
Cross-multiplying:
-6.0(16d_i) = (16 - d_i)
-96d_i = 16 - d_i
Combining like terms:
-95d_i = 16
Dividing both sides by -95:
d_i ≈ -0.1684 cm
Since the image distance is negative, it indicates that the image formed by the diverging lens is a virtual image on the same side as the object.
Now, let's calculate the magnification (m):
The magnification formula is given by:
m = -d_i / d_o
Substituting the values:
m = -(-0.1684 cm) / 16 cm
m ≈ 0.0105
The magnification is positive, indicating that the image formed by the diverging lens is virtual and upright, but smaller in size compared to the object.
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A crate with a mass of 82kg sits on a tilted rampand experiences friction so that it remains motionless. The ramp is tilted at an angle of 22 degrees relative to the ground. What is the magnitude of the normal force in newtons exerted on the crate from the ramp?
A crate with a mass of 82kg sits on a tilted ramp and experiences friction so that it remains motionless. The magnitude of the normal force in newtons exerted on the crate from the ramp is 327.89 N.
To determine the magnitude of the normal force exerted on the crate from the ramp, we need to consider the forces acting on the crate in the vertical direction.
The normal force (N) is the force exerted perpendicular to the ramp by the surface, counteracting the gravitational force pulling the crate downward.
The gravitational force acting on the crate can be calculated using the formula:
[tex]Force_{gravity[/tex] = mass * gravity
where the mass of the crate is 82 kg and the acceleration due to gravity is approximately 9.8 [tex]m/s^2[/tex]
[tex]Force_{gravity[/tex] = 82 kg * 9.8 [tex]m/s^2[/tex]
Next, we need to decompose the gravitational force into its components parallel and perpendicular to the ramp. The component perpendicular to the ramp is equal to the normal force (N), and the component parallel to the ramp is equal to the force due to gravity acting down the ramp.
The component of force due to gravity acting down the ramp is given by:
[tex]Force_{parallel[/tex] = [tex]Force_{gravity[/tex]* sin(theta)
where theta is the angle of the ramp, which is 22 degrees in this case.
[tex]Force_{parallel[/tex]l = 82 kg * 9.8 [tex]m/s^2[/tex] * sin(22 degrees)
Finally, since the crate remains motionless, the normal force (N) must balance the force parallel to the ramp. Therefore, the normal force can be calculated as:
N = [tex]Force_{parallel[/tex]
Substituting the values:
N = 82 kg * 9.8 [tex]m/s^2[/tex]* sin(22 degrees)
Calculating the value:
N ≈ 327.89 N
Therefore, the magnitude of the normal force exerted on the crate from the ramp is approximately 327.89 N.
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If the supply frequency is 25kHz for the circuit shown below, the true power is 1.77mW. [3 marks] R х. w mm 4.7 ΚΩ 8.0 k 2 xo H 3.5 ΚΩ ll
the value of the true power is 1.948 mW. We know that the true power of a circuit is given by P = Vrms Irms cosϕ
where Vrms is the rms value of the voltage applied, Irms is the rms value of the current flowing through the circuit and cosϕ is the power factor.
So, we have to calculate the current flowing through the circuit, which is given by I = V / Z where V is the voltage applied and Z is the impedance of the circuit.P = Vrms Irms cosϕWe know that cosϕ = Re(P) / S where Re(P) is the real part of the power and S is the apparent power.So, Re(P) = cosϕ S = P / cosϕNow, S = Vrms Irms = 5V / (8.2kΩ × √2) × 0.609mA × √2 = 1.722mVATherefore, Re(P) = 1.77mW (given) / cos23.6° ≈ 1.948mWApproximately, the value of the true power is 1.948 mW.
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Question 15 ( 1 point) Which of the following is correct in AC circuits? In the inductor circuit, current is out of phase with voltage; in the capacitor circuit, current is in phase with voltage; in the resistor circuit, current is in phase with voltage. In the resistor circuit, current is out of phase with voltage; in the inductor circuit, current is in phase with voltage; in the capacitor circuit, current is out of phase with voltage. In the inductor circuit, current is out of phase with voltage; in the resistor circuit, current is in phase with voltage; in the capacitor circuit, current is out of phase with voltage. In the capacitor circuit, current is out of phase with voltage; in the inductor circuit, current is in phase with voltage; in the resistor circuit, current is in phase with voltage. Page 5 of 6
In AC circuits, the correct statement is: In the inductor circuit, current is out of phase with voltage; in the resistor circuit, current is in phase with voltage; in the capacitor circuit, current is out of phase with voltage.
In AC circuits, the behavior of current and voltage can differ based on the components present in the circuit: resistors, inductors, and capacitors.
1. Resistor Circuit:
In a resistor circuit, the current flowing through a resistor is in phase with the voltage across it. This means that the current and voltage reach their maximum and minimum values at the same time.
2. Inductor Circuit:
In an inductor circuit, when an AC voltage is applied, the current lags behind the voltage. This means that the current reaches its maximum and minimum values after the voltage has reached its maximum and minimum values. The phase shift between the current and voltage in an inductor circuit is 90 degrees, with the current lagging behind the voltage.
3. Capacitor Circuit:
In a capacitor circuit, when an AC voltage is applied, the current leads the voltage. This means that the current reaches its maximum and minimum values before the voltage has reached its maximum and minimum values. The phase shift between the current and voltage in a capacitor circuit is also 90 degrees, but in this case, the current leads the voltage.
Based on these explanations, the correct statement is that in the inductor circuit, current is out of phase with voltage; in the resistor circuit, current is in phase with voltage; in the capacitor circuit, current is out of phase with voltage.
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Provide examples of each band of E/M radiation.
The electromagnetic (EM) spectrum consists of various bands of radiation, each characterized by different wavelengths and frequencies. Examples of each band of EM radiation are radio waves, microwaves, uv rays etc.
Radio Waves: Used for communication and broadcasting, such as AM and FM radio waves, as well as TV signals.Microwaves: Used in microwave ovens, wireless communication (e.g., Wi-Fi and Bluetooth), and radar systems.Infrared Radiation: Commonly used for thermal imaging, remote controls, and heating applications.Visible Light: The band of EM radiation that is visible to the human eye, enabling us to perceive colors and our surroundings.Ultraviolet (UV) Radiation: Examples include UV-A, UV-B, and UV-C rays, which have varying effects such as tanning, vitamin D synthesis, and can also cause sunburn and skin damage.X-rays: Used in medical imaging, such as X-ray radiography, CT scans, and airport security scanners.Gamma Rays: Highly energetic radiation emitted during nuclear reactions or radioactive decay, used in cancer treatments (radiotherapy) and industrial applications.To know more about electromagnetic refer to-
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A particle is projected from O with an initial velocity of 5 ms-¹, at an angle of 30° above the horizontal. At time ts after projection the horizontal and vertically upward displacements of the particle from O are xm and ym, respectively. a In the case where the particle is projected from the ground, express x and y in terms of t and show that the equation of the trajectory of the particle is y √√3 4 b Given that the particle returns to the ground, find the range of the particle.
The equation of the trajectory of the particle is y = x √(√3/4).
When a particle is projected from point O with an initial velocity of 5 m/s at an angle of 30° above the horizontal, we can analyze its motion in terms of horizontal (x) and vertical (y) displacements.
Since the particle is projected horizontally from the ground, there is no initial vertical velocity component. Therefore, the horizontal displacement can be expressed as:
x = (5 m/s) * t
In the vertical direction, we can consider the initial vertical velocity (uy) as 5 m/s multiplied by the sine of the launch angle (30°). The acceleration due to gravity (g) acts vertically downward, so we can use the kinematic equation:
y = (5 m/s * sin(30°)) * t - (0.5 * 9.8 m/s² * t^2)
Simplifying this equation yields:
y = (5/2) * t - (4.9 * t²)
Combining the horizontal and vertical displacements, we have the equation of the trajectory:
y = x √(√3/4)
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You would like to use Gauss"s law to find the electric field a distance T
from a point charge. In order to take advantage of the symmetry of the
situation, the integration should be performed over:
Gauss's law provides a powerful method for determining the electric field generated by a point charge. By using a Gaussian surface, which is a closed surface with an area of 4πr² (where r is the distance from the point charge), the electric field can be calculated efficiently.
According to Gauss's law, the total electric flux through a closed surface is equal to the charge enclosed divided by the permittivity of free space. By choosing a suitable Gaussian surface that exhibits symmetry and allows for a constant electric field over its surface, the calculation becomes simplified.
The flux through the Gaussian surface can be obtained by multiplying the electric field magnitude by the surface area. The charge enclosed within the surface can then be determined using the total flux and Gauss's law.
Finally, the electric field can be obtained by dividing the total charge enclosed by the permittivity of free space and the surface area of the Gaussian surface. This approach is particularly advantageous when dealing with symmetric situations where the electric field remains constant over the Gaussian surface.
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A 0.55 kg length of aluminum wire is warmed by 11.3
∘
C by an electric current. How much heat was generated by the current? kcal
The heat generated by the current is 6.2865 kcal.
To calculate the heat generated by the current, we can use the equation:
Q = mcΔT
Where Q is the heat generated, m is the mass of the aluminum wire, c is the specific heat capacity of aluminum, and ΔT is the change in temperature.
Given:
m = 0.55 kg (mass of the aluminum wire)
ΔT = 11.3 °C (change in temperature)
The specific heat capacity of aluminum is approximately 0.22 kcal/(kg·°C).
Substituting the values into the equation, we get:
Q = (0.55 kg) * (0.22 kcal/(kg·°C)) * (11.3 °C)
Calculating this expression, we find:
Q ≈ 6.2865 kcal
Therefore, the heat generated by the current is approximately 6.2865 kcal.
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How many mega-joules of energy can one obtain from growing 7.375 acres of switchgrass over one year? Assume that one can obtain 500 gallons of ethanol per acre of switchgrass per year. 1.053×10
5
MJ 1.221×10
5
MJ 3.271×10
5
MJ 44.348MJ 5.09×10
4
MJ 500MJ Question 17 5 pts Approximately how many acres of switchgrass would you have to grow in order to produce enough ethanol fuel for the equivalent of 4.967×10
4
gallons of gasoline? Assume that one can obtain 500 gallons of ethanol per acre of switchgrass. 138 acres 127 acres 115 acres 1.35×10
−2
acres 144 acres 1.15 acre
The correct answer for Part A is option (A) 1.053×10^5 MJ of energy and for Part B is (B) 127 acres. One can obtain 500 gallons of ethanol per acre of switchgrass per year. According to the problem, area= 7.375 acres
Part A: Energy produced from one gallon of ethanol = 2.67 MJ
Energy produced from switchgrass in one year = Energy produced from one gallon of ethanol × Number of gallons of ethanol produced per acre × Area of switchgrass
Energy produced from switchgrass in one year = 2.67 MJ/gallon × 500 gallons/acre × 7.375 acres
Energy produced from switchgrass in one year = 9,910.625 MJ
Thus, one can obtain 9,910.625 MJ of energy from growing 7.375 acres of switchgrass over one year.
1.053×10^5 MJ is the closest option, therefore, the correct option is (A) 1.053×10^5 MJ.
Part B: Ethanol produced per acre of switchgrass = 500 gallons per year; Gallons of gasoline = 4.967×10^4 gallons
Energy produced from one gallon of ethanol = 2.67 MJ
Energy produced from gasoline = 31.5 MJ/gallon
Energy produced from switchgrass in one year = Energy produced from one gallon of ethanol × Number of gallons of ethanol produced per acre × Area of switchgrass
Energy produced from switchgrass in one year = Energy produced from gasoline × Number of gallons of gasoline ÷ Energy produced from one gallon of ethanol
Area of switchgrass required = Number of gallons of ethanol required ÷ Number of gallons of ethanol produced per acre
Area of switchgrass required = (Energy produced from gasoline × Number of gallons of gasoline) ÷ (Energy produced from one gallon of ethanol × Number of gallons of ethanol produced per acre)
Area of switchgrass required = (31.5 MJ/gallon × 4.967×10^4 gallons) ÷ (2.67 MJ/gallon × 500 gallons/acre)
Area of switchgrass required = 117.558 acres ≈ 118 acres
Therefore, one would need to grow approximately 118 acres of switchgrass to produce enough ethanol fuel for the equivalent of 4.967×10^4 gallons of gasoline.
The closest option is 127 acres, therefore the correct answer is (B) 127 acres.
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comparing bridges with switches, which are three (3) characteristics specific to a switch?
Three characteristics specific to a switch, when comparing it to bridges, are:
Layer 2 functionality: Switches operate at the data link layer (Layer 2) of the OSI model, providing functionalities such as MAC address learning, filtering, and forwarding. They use MAC addresses to make forwarding decisions and create separate collision domains for connected devices.Multiple simultaneous connections: Switches typically have multiple ports, allowing them to establish simultaneous connections with multiple devices. Each port operates independently, enabling efficient and simultaneous communication between different devices connected to the switch.Enhanced performance and throughput: Switches are designed to provide faster data transfer rates and higher bandwidth compared to bridges. They use dedicated hardware for switching and forwarding packets, resulting in improved performance and reduced latency.In more detail, switches are specifically designed for local area networks (LANs) and provide advanced features compared to bridges. They utilize Layer 2 functionality, which includes features like MAC address learning, filtering, and forwarding. Switches learn the MAC addresses of devices connected to their ports by examining the source MAC addresses of incoming frames. This information is then used to make forwarding decisions, allowing switches to send frames only to the appropriate port instead of broadcasting them to all connected devices, as bridges do.
Switches also offer the ability to establish multiple simultaneous connections due to their multiple ports. Each port operates independently, creating separate collision domains and enabling devices to communicate concurrently. This simultaneous communication enhances network efficiency and reduces network congestion.
Furthermore, switches are optimized for performance and throughput. They employ dedicated hardware and use faster switching mechanisms, such as store-and-forward or cut-through, to transfer data at higher speeds. Switches have higher bandwidth capacities, allowing for efficient handling of network traffic and better overall network performance compared to bridges.
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Ice at 0 degrees celsius is mixed with water at 0 degrees celsius in a perfectly insulated calorimeter. what options correctly describe what will happen next.
1. what happens depends on the relative masses of ice and water.
2. all the ice will melt.
3. no ice will melt and no water will freeze.
4. all the water will freeze.
Ice at 0 degrees celsius is mixed with water at 0 degrees celsius in a perfectly insulated calorimeter.what happens depends on the relative masses of ice and water,some of the ice will melt and the final temperature will be 0 degrees Celsius.So the correct options are 1,2 and 3.
The amount of ice that melts depends on the relative masses of ice and water. If there is more ice than water, then all of the ice will melt. If there is more water than ice, then some of the ice will remain. The final temperature will be 0 degrees Celsius regardless of how much ice melts.
Option 4 is incorrect because the water is already at 0 degrees Celsius, so it cannot freeze. Option 3 is incorrect because heat is not being transferred into or out of the system, so the temperature will not change.Therefore correct option are 1, 2 and 3.
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A bullet with mass m hits a ballistic pendulum with length L and mass M and lodges in it. When the bullet hits the pendulum it swings up from the equilibrium position and reaches an angle α at its maximum. Determine the bullet's initial velocity before it hits the block given: m=22 gM=4 kg L=2 mα=7deg 1. Find the maximum change in height of the pendulum after the collision 2. Find the velocity of the Block bullet just after the collision. 3. Determine the bullet's initial velocity before it hits the block.
The bullet's initial velocity before it hits the block is 0 m/s.
Using conservation of mechanical energy, we can write the equation:
0.5 * (m_bullet + M_pendulum) * v_bullet^2 = m_pendulum * g * Δh
Substituting the known values:
0.5 * (0.022 kg + 4 kg) * 0^2 = 4 kg * 9.8 m/s^2 * Δh
0 = 39.2 Δh
This implies that the maximum change in height of the pendulum is zero. The pendulum does not swing up; instead, it remains at its equilibrium position.
Find the velocity of the block-bullet just after the collision:
Since the bullet comes to rest after the collision and lodges in the pendulum, the velocity of the block-bullet system just after the collision is 0 m/s.
Determine the bullet's initial velocity before it hits the block:
From the previous calculations, we can see that the bullet's initial velocity before it hits the block is also 0 m/s.
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An engine in one cycle takes in 150 J of energy from a 900 K thermal source. If the engine discharges energy into a thermal reservoir at 300K, find: a. What is the maximum, theoretically possible efficiency of this engine? b. What is the maximum, theoretically possible amount of work one can get out of the engine per cycle? C. If this is a real engine working with efficiency of 25%, how much work does this engine do in one cycle?
a. The maximum, theoretically possible efficiency of this engine is approximately 67%. b. The maximum, theoretically possible amount of work one can get out of the engine per cycle is 100.5 Joules. c. The engine would do 37.5 Joules of work in one cycle if it operates with an efficiency of 25%.
a. To find the maximum, theoretically possible efficiency of the engine, we can use the Carnot efficiency formula. The Carnot efficiency is given by the equation:
Efficiency = 1 - (T_cold / T_hot)
where T_cold is the temperature of the cold reservoir (in Kelvin) and T_hot is the temperature of the hot reservoir (in Kelvin). In this case, T_hot = 900 K and T_cold = 300 K.
Efficiency = 1 - (300 K / 900 K) = 1 - (1/3) = 2/3 ≈ 0.67 or 67%
b. The maximum, theoretically possible amount of work one can get out of the engine per cycle can be calculated using the equation:
Maximum Work = Efficiency * Energy Input
where Efficiency is the maximum possible efficiency (0.67) and Energy Input is the energy taken in from the thermal source (150 J).
Maximum Work = 0.67 * 150 J = 100.5 J
c. If the engine is operating with an efficiency of 25%, we can calculate the actual work done by the engine in one cycle using the equation:
Actual Work = Efficiency * Energy Input
where Efficiency is the actual efficiency (0.25) and Energy Input is the energy taken in from the thermal source (150 J).
Actual Work = 0.25 * 150 J = 37.5 J
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A shaft is rotating at a uniform speed with four masses m, m2, m3, m4 of magnitudes 150kg, 225kg, 180kg, 195kg respectively. The masses are rotating in the same plane, and the corresponding radii of rotation are 200mm, 150mm, 250mm, 300mm. The angles made by these masses with respect to horizontal are 0°, 45°, 120°, 255° respectively. 2.1. Find the magnitude and position of balance mass by drawing the Angular Position diagram and Vector diagram. The balance mass radius of rotation is 200mm. [24] 2.2. Use the Analytical method to determine the magnitude and position of the balance mass, placing the mass-radius of rotation at 200mm [16] 2.3. Is there a difference between the two answers? Discuss your reasoning.
If there is a significant difference between the two answers, it could indicate a mistake in the calculations or the graphical representation. It's important to carefully check the calculations and ensure accurate measurements and angles are used.
In this problem, we need to find the magnitude and position of the balance mass in a rotating shaft. We can approach this using two methods: the graphical method (Angular Position diagram and Vector diagram) and the analytical method.
2.1 Graphical Method
To find the balance mass using the graphical method, we can construct an Angular Position diagram and a Vector diagram. In the Angular Position diagram, we plot the masses at their respective angles. In the Vector diagram, we represent the magnitudes and directions of the masses as vectors. By adjusting the magnitude and position of the balance mass vector, we can achieve balance in the system. The magnitude of the balance mass can be determined by measuring the length of the balanced vector.
2.2 Analytical Method:
To determine the balance mass using the analytical method, we can sum the moments of the masses about the desired position of the balance mass. The moment is calculated by multiplying the mass with its radius of rotation and the sine of the angle it makes with the horizontal. By setting the sum of the moments equal to zero, we can solve for the magnitude and position of the balance mass.
2.3 Comparison:
The two methods should provide the same result for the magnitude and position of the balance mass. However, there may be slight differences due to measurement errors in the graphical method or rounding errors in the analytical method. In practice, the analytical method is generally more accurate and precise.
If there is a significant difference between the two answers, it could indicate a mistake in the calculations or the graphical representation. It's important to carefully check the calculations and ensure accurate measurements and angles are used. In such cases, repeating the calculations and double-checking the inputs can help identify and rectify any errors.
Overall, both methods should yield similar results for the balance mass, but the analytical method is generally more reliable.
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Light of 600 nm wavelength passes through a double slit and forms interference fringes on a screen 1.2 m away. If the slits are 0.2 mm apart, what is the distance between the zeroth- order maximum and a third-order minimum.
The distance between the zeroth-order maximum and a third-order minimum in the interference pattern is approximately 1.08 mm.
The distance between the zeroth-order maximum and a third-order minimum in the interference pattern formed by light passing through a double slit can be calculated using the formula Δy = (λL) / (d), where λ is the wavelength of light, L is the distance from the slits to the screen, and d is the distance between the slits.
Explanation: In the interference pattern formed by a double slit, we observe bright and dark fringes. The bright fringes are known as maxima, while the dark fringes are known as minima. The zeroth-order maximum corresponds to the central bright fringe.
To calculate the distance between the zeroth-order maximum and a third-order minimum, we need to consider the relative position of the fringes. The general formula for calculating the fringe spacing in a double-slit interference pattern is Δy = (λL) / (d), where Δy is the distance between adjacent fringes, λ is the wavelength of light, L is the distance from the slits to the screen, and d is the distance between the slits.
In this case, we are interested in the distance between the zeroth-order maximum (central bright fringe) and a third-order minimum (the third dark fringe on either side of the central maximum). Since the third-order minimum is located three fringes away from the central maximum, we can multiply the fringe spacing Δy by 3 to get the desired distance.
Using the given values:
λ = 600 nm = 600 × 10^(-9) m (wavelength of light)
L = 1.2 m (distance from the slits to the screen)
d = 0.2 mm = 0.2 × 10^(-3) m (distance between the slits)
Using the formula, Δy = (λL) / (d), we can calculate the fringe spacing:
Δy = (600 × 10^(-9) m * 1.2 m) / (0.2 × 10^(-3) m)
Δy = 3.6 × 10^(-4) m
Multiplying the fringe spacing by 3, we get the distance between the zeroth-order maximum and a third-order minimum:
Distance = 3 * Δy
Distance = 3 * 3.6 × 10^(-4) m
Distance = 1.08 × 10^(-3) m
Therefore, the distance between the zeroth-order maximum and a third-order minimum in the interference pattern is approximately 1.08 mm.
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A circular area with a radius of 7.00 cm lies in the xy-plane. What is the magnitude of the magnetic flux through this circle due to a uniform magnetic field with For related problem-solving tips and strategies, you a magnitude of 0.270 T in the +z-direction? may want to view a Video Tutor Solution of Magnetic flux calculations. \& Incorrect; Try Again; 4 attempts remaining Part B What is the magnitude of the magnetic flux through this circle due to the same magnetic field (with a magnitude of 0.270 T ), now at an angle of 51.9°from the +z-direction? What is the magnitude of the magnetic flux through this circle due to the same magnetic field (with a magntiude of 0.270 T ), now in the +y-direction?
The magnitude of the magnetic flux through the circular area is approximately:
Part A: 0.0124 Wb
Part B: 0.0087 Wb
Part C: 0 Wb
To calculate the magnetic flux through the circular area, we can use the formula:
Φ = B * A * cos(θ)
where Φ is the magnetic flux, B is the magnetic field, A is the area, and θ is the angle between the magnetic field and the normal to the area.
Part A:
Given:
B = 0.270 T,
A = π * (0.07 m)²,
and θ = 0° (since the magnetic field is in the +z-direction).
Putting in the values:
Φ = (0.270 T) * (π * (0.07 m)²) * cos(0°)
Φ = 0.270 T * 0.0154 m² * 1
Φ ≈ 0.0124 Wb (webers)
Part B:
Given: B = 0.270 T, A = π * (0.07 m)², and θ = 51.9° (angle from the +z-direction).
Putting in the values:
Φ = (0.270 T) * (π * (0.07 m)²) * cos(51.9°)
Φ = 0.270 T * 0.0154 m² * cos(51.9°)
Φ ≈ 0.0087 Wb (webers)
Part C:
Given:
B = 0.270 T,
A = π * (0.07 m)², and
θ = 90° (since the magnetic field is in the +y-direction).
Plugging in the values:
Φ = (0.270 T) * (π * (0.07 m)²) * cos(90°)
Φ = 0.270 T * 0.0154 m² * 0
Φ = 0 Wb (webers)
Therefore, the magnitude of the magnetic flux through the circular area is approximately:
Part A: 0.0124 Wb
Part B: 0.0087 Wb
Part C: 0 Wb
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An especially violent lightning bolt has an average current of 1.15×10
3
A lasting 0.202 s. How much charge is delivered to the ground by the lightning bolt? Number Units
Thus, the amount of charge delivered to the ground by the lightning bolt is 232.3 coulombs (C).
An especially violent lightning bolt has an average current of 1[tex].15 × 10³[/tex]
A, lasting 0.202 s.
To determine the amount of charge delivered to the ground by the lightning bolt, we can use the formula
Q = I × t
where Q is the charge, I is the current, and t is the time.
Substituting the given values,
we have Q =[tex]1.15 × 10³ A × 0.202 s[/tex]
Q =[tex]232.3 C[/tex]
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