The distance from the launch point to the plate is x = 0/v = 0/√3.5 x 10-15 = 0, meaning that the launch point must be at the same point as the plate.
What is kinetic energy?Kinetic energy is the energy of motion. It is the energy associated with the movement of an object or particle, and is defined as the work needed to accelerate the object to its current velocity. Kinetic energy is a form of energy that is always associated with the movement of an object, regardless of its speed or direction. It is calculated by multiplying the mass of the object by the square of its velocity. Kinetic energy exists in both living and non-living objects, and is a key factor in the behavior of these objects.
The distance between the launch point and the plate can be determined using the formula for kinetic energy, which is E = ½mv². To solve for the distance, we rearrange the equation to v² = 2E/m and then plug in the given values: v² = 2(1.6 x 10-17)/(9.11 x 10-31) = 3.5 x 10-15. Then, using the equation x = vt, we solve for the distance x, where t is the time it takes for the electron to reach the plate. Since the electron needs to come to a complete stop, we set the velocity equal to zero. Thus, the distance from the launch point to the plate is x = 0/v = 0/√3.5 x 10-15 = 0, meaning that the launch point must be at the same point as the plate.
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2. A 38kg child is at the top of a slide that is 2. 1m tall.
(a) If there is no friction, how fast will they be moving when they reach the bottom of the slide?
(b) If they lose 250. 0J of energy to sound, heat, and friction, how fast will they be moving when they reach the bottom?
Answer:
3. A 0. 850 kg air-track glider moving at 1. 75 m/s bumps into a 1. 45 kg glider initially at rest.
(a) If the collision is elastic, find the total kinetic energy after collision.
(b) If the collision is completely inelastic, find the total kinetic energy after collision.
Show all your work
Part a: Velocity with no friction: v = 6.41 m/s.
Part b: velocity of the moving object when it reached at the bottom is found as 5.29 m/s.
Explain the term kinetic energy?Kinetic energy, which may be seen in the movement of an item or subatomic particle, is indeed the energy of motion. Kinetic energy is present in every particle and moving object.Potential energy P.E
P.E = mgh
P.E = 38 x 9.8 x 2.1 J
This all transforms to kinetic energy just at bottom = 0.5 mv² if there is no energy loss.
So,
0.5 x 38 x v² = 38 x 9.8 x 2.1,
v = 6.41 m/s
Part b: If friction results in a loss of energy of 250 J
0.5 x 38 x v² = 38 x 9.8 x 2.1 - 250
v² = 532.04/ (0.5 x 38)
v = 5.29 m/s
Thus, the velocity of the moving object when it reached at the bottom is found as 5.29 m/s.
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The correct question is-
2. A 38kg child is at the top of a slide that is 2. 1m tall.
(a) If there is no friction, how fast will they be moving when they reach the bottom of the slide?
(b) If they lose 250. 0J of energy to sound, heat, and friction, how fast will they be moving when they reach the bottom?
what charge q should be placed at the center of the square to keep the other four charges in equilibriumn
Answer:
To keep the other four charges in equilibrium, the charge q that should be placed at the center of the square is equal in magnitude but opposite in sign to the total charge of the other four charges.
suppose a 3000 cm3 container holds 7.0 g of nitrogen gas at a pressure of 200 kpa . the gas can be heated at constant pressure if a piston moves outward to let the gas expand as it's heated. alternatively, the gas can be heated at constant volume if the piston is locked in place to prevent expansion. how does the heat required for one of these processes compare to the heat required for the other process? how much heat is required to double the volume and temperature at constant pressure?
The heat required would be Q = 7.0 g/28 g/mol * 20.8 J/molK * (2T - T) = 544 J.
What is heat?Heat is the transfer of energy from one body or system to another due to the difference in their temperatures. Heat is commonly transferred through thermal conduction, convection, radiation, or when two bodies with different temperatures come into direct contact.
The heat required for a process at constant pressure is greater than the heat required for a process at constant volume. This is because when a gas is heated at constant pressure, work is done to push the piston outward, so more energy is required.
To double the volume and temperature at constant pressure, the heat required would be equal to the change in internal energy of the system,
which can be calculated using the equation Q = nCvΔT,
where n is the number of moles of gas,
Cv is the molar heat capacity,
and ΔT is the change in temperature.
In this case, the molar heat capacity of nitrogen gas is 20.8 J/molK,
So the heat required would be Q = 7.0 g/28 g/mol * 20.8 J/molK * (2T - T) = 544 J.
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Find the distance and displacement of Greyhound bus traveling 90km north and 15km south
here is ur answer
MARK BRAIN PLease
A penny is dropped off the top of the Statue of Liberty, 93 m tall. What is the speed of the penny after 2.5 seconds (assuming no air resistance)?
The speed of the penny after 2.5 seconds is 24.5 m/s.
What is speed?
Speed is a scalar quantity that refers to "how fast an object is moving." It is the rate at which an object changes its position, and it is measured in units of distance per unit of time (such as meters per second or miles per hour). Speed is related to the distance traveled by an object and the time it takes to travel that distance, and it can be calculated by dividing the distance traveled by the time it took to travel that distance.
The speed of an object in free fall can be calculated using the equation:
v = g * t
where v is the velocity, g is the acceleration due to gravity (approximately 9.8 m/s^2 on the Earth's surface) and t is the time elapsed.
In this scenario, the penny is dropped off the top of the Statue of Liberty, which is 93 m tall, and we want to find the speed of the penny after 2.5 seconds.
So, we can substitute the values in the equation:
v = 9.8 m/s^2 * 2.5 s = 24.5 m/s
Therefore, the speed of the penny after 2.5 seconds is 24.5 m/s (assuming no air resistance).
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does turning up the thermostat in the middle of the night for 15 minutes reduce the amount of time it takes it to reach temp in the morning?
Yes, turning up the thermostat in the middle of the night for 15 minutes reduce the amount of time it takes it to reach temp in the morning.
The United States Department of Energy suggests turning thermostats back 7 to 10 degrees from their normal settings for 8 hours per day in order to achieve annual savings of up to 10%. The Department of Energy estimates that savings of approximately 1 percent can be achieved for each degree of thermostat adjustment that is made every 8 hours. The amount of time it takes for the temperature to reach the desired level in the morning can be reduced by raising the thermostat for fifteen minutes in the middle of the night.
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if a simple pendulum oscillates with small amplitude and its length is doubled, what happens to the frequency of its motion? (a) it doubles. (b) it becomes times as large. (c) it becomes half as large. (d) it becomes 1/ vc times as large. (e) it remains the same.
Option E - it remains the same , if a simple pendulum oscillates with small amplitude and its length is doubled .
The greatest displacement or distance that a point on a wave or vibrating body may travel in relation to its equilibrium position
A wave's amplitude is the difference between its starting position and its maximum displacement. Frequency is the amount of waves which pass past the certain place each second. Period is the length of time it takes for a wave cycle to finish.
Given,length of a simple pendulum is doubled .
To find, frequency of motion.
we have Time period T before doubling the length,
T = 2π[tex]\sqrt{\frac{L}{g} }[/tex] L- length,g-acceleration due to gravity
T/2π = [tex]\sqrt{\frac{L}{g} }[/tex]
g = L(2π/T[tex])^{2}[/tex] → 1
when length is doubled,Time period [tex]T^{'}[/tex]
[tex]T^{'}[/tex] = 2π [tex]\sqrt{\frac{2L}{g} }[/tex]
( [tex]T^{'}[/tex] /2π[tex])^{2}[/tex] = [tex]\frac{2L}{g}[/tex]
g=2L( 2π/T[tex])^{2}[/tex] → 2
from equation 1 and 2
L( 2π/T[tex])^{2}[/tex] = 2L( 2π/T[tex])^{2}[/tex]
2π/T=[tex]\sqrt{2}[/tex](2π/T)
1/T =[tex]\sqrt{2}[/tex](1/T)
we know,frequency γ = 1/T
γ =[tex]\sqrt{2}[/tex] γ '
γ ' =[tex]\frac{1}{\sqrt{2} }[/tex] γ
Therefore option E is correct.
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If a current of 16A flows through a wire with a resistance of 0.6 Ohms, calculate the voltage.
If a current of 16A flows through a wire with a resistance of 0.6 Ohms, the voltage is: 9.6V.
How to find the voltage?Using this formula to determine the voltage
V = I × R
Where:
V = voltage = ?
I = current = 16A
R = resistance = 0.6 Ohms
Let plug in the formula
V = 16A × 0.6 Ohms
V = 9.6V
Therefore the voltage is 9.6V
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If you go to the moon, which force is greater? The force of gravity that you exert on the moon or the force of gravity the moon exerts on you?
The force you exert on the moon
The force the moon exerts on you
The force of gravity you exert on the moon equals the force of gravity the moon exerts on you
WILL GIVE BRAINLIEST AWARD
The force of gravity the moon exerts on you is greater than the force of gravity you exert on the moon.
What is the force of gravity?The force of gravity is a fundamental pressure of nature that acts between two gadgets with mass. It's miles the pressure that attracts objects toward every other, and its energy is proportional to the mass of the gadgets and the space among them. The pressure of gravity is liable for the motion of planets and different celestial gadgets, as well as for maintaining items on the floor. It turned into first described by way of Sir Isaac Newton in his laws of motion and normal gravitation, which stated that every item inside the universe attracts each different item with a pressure proportional to the product of their masses and inversely proportional to the rectangular of the distance between them.
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The force the moon exerts on you is greater.
What do you mean by gravity?Gravity is a force of attraction between two objects in space that is proportional to the masses of the objects and inversely proportional to the square of the distance between them. It is the force that holds planets in orbit around stars and is what causes objects to fall to the ground when dropped. On Earth, the force of gravity is what gives weight to objects and what keeps us anchored to the surface. The strength of the gravitational force is determined by the mass of the objects and the distance between them, with more massive objects having a stronger gravitational pull.
The force of gravity is the force with which a celestial body attracts objects toward its center. The force of gravity is proportional to the mass of the object and inversely proportional to the square of the distance between the objects. The force of gravity acts as the source of the weight of objects. The force of gravity is responsible for holding objects in orbit around the earth and other celestial bodies. The most well-known example of the force of gravity is the attraction between the earth and moon, which causes the tides.
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if a ball is thrown into the air with a velocity of 40 fts, its height in feet t seconds later is given by y 40t 16t2. (a) find the average velocity for the time period beginning when t 2 and lasting (i) 0.5 second (ii) 0.1 second (iii) 0.05 second (iv) 0.01 second
The change in position or displacement (Δx) divided by the time intervals (Δt) in which the displacement occurs yields the average velocity.
What is the average velocities of ball?Depending on the sign of the displacement, the average velocity can be positive or negative.
To begin, in order to calculate average velocities, we need the position for each instant mentioned:
Y(2) = 2 ft
Y(2.5) = 0 ft
Y(2.1) = 13.44 ft
Y(2.05) = 14.76 ft
Y(2.01) = 15.7584 ft
Let us now compute the average velocities:
V(2 - 2.5) = Y(2.5) - Y(2) / 2.5 - 2
= -32 ft/s
V(2 - 2.1) = Y(2.1) - Y(2) / 2.1 - 2
= -25.6 ft/s
V(2 - 2.05) = Y(2.05) - Y(2) / 2.05 - 2
= -24.8 ft/s
V(2 - 2.01) = Y(2.01) - Y(2) / 2.01 - 2
= -24.16 ft/s
Now, we can derive the expression for y for the instantaneous velocity:
For t=2s, V(t) = 40 - 32t V(2) = -24ft/s
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a 6.5 kg object is suspended by a string from the ceiling of an elevator. the acceleration of gravity is 9.8 m/s 2 . determine the tension in the string if it is accelerating upward at a rate of 2.6 m/s 2 . answer in units of n. answer in units of n.
The rightward directions she gives are as follows: 1. Move 400 meters to the northwest. 3. The wealth is hidden there, 700 meters to the east-southeast.
What else do u mean by 9.8m s2 of acceleration caused by gravity?This means that anything is pushed toward the center of the earth, which causes the pulled object to accelerate by 9.8 meters per second as it "falls" to the earth. As a result, each second that such a body is dragged towards the earth, its velocity (speed with direction) increases by around 9.8 meters per second.
Is the gravity always 9.8 inches?It should be remembered that gravitation is not a continuous force; gravity weakens the more you are from the center of the Earth. Since it fluctuates from 9.83 at the poles to 9.78 at the equator, it isn't even a consistent at the surface. Due to this, we utilize an average value of 9.8.
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(c) what is the minimum thickness of a soap bubble film (air-soap-air) with refractive index 1.38 that results in a constructive interference in the reflected light if this film is illuminated by a beam of light of wavelength 610 nm?
The minimum thickness of a soap bubble film (air-soap-air) with refractive index 1.38 that results in a constructive interference in the reflected light if this film is illuminated by a beam of light of wavelength 610 nm is 150
nm.
What is refractive index ?The refractive index of an optical medium is described as a dimensionless number that gives the indication of the light bending ability of that medium.
Condition for constructive interference is given as ,
2μt = (2n + 1) λ/2
t = (2n + 1) x 900 / 4x 1.5
where n = 0(for minimum thickness)
Therefore t= 150nm
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a ping-pong ball has a diameter of 4.18 cm and average density of 0.0348 g/cm3 . what force would be required to hold it completely submerged under water? the acceleration of gravity is 9.8 m/s 2 . answer in units of n.
The force required to hold the ping pong ball completely under the water is 36,189.98 dyne.
Given:Diameter of ball = 4.18 cm
The radius of the ball = 2.09 cm
The volume of the ball can be calculated as V= [tex]\frac{4}{3}[/tex]π r³
Therefore, the volume of the ball = 38.26 cm³
The net force required to completely submerge a ball under water = (Buoyant force) - (the weight of the ball)
If ρ₁ is used for the density of water. Then, the value of ρ₁ is 1 g cm⁻³.
Buoyant force = ρ₁gV
= 1 × 980 × 38.26
= 37494.80 dyne
Here, ρ₂ = density of ball = 0.0348 1 g cm⁻³.
Weight of ball = ρ₂gV
= 0.0348 × 980 × 38.26
= 1304.82 dyne
Therefore, the net force required to completely submerge a ball under water = 37494.80 - 1304.82 = 36,189.98 dyne or 0.362 N
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Why should a person warm up before exercising?
To gradually increase blood flow to the body
To spend extra time thinking about exercise
To keep from getting too tired after the activity
To help increase muscle strength
Answer:
To gradually increase blood flow to the body
A blender is 70% efficient. It has a total input power of 600 W. Calculate the useful output power. Help meh. I has no idea ¯\_(ツ)_/¯
The useful output power of the blender is 420 W.
How to calculate useful output power?To calculate the useful output power of the blender, we can use the equation:
P_output = P_input * efficiency
Where P_output is the useful output power, P_input is the total input power, and efficiency is the percentage of input power that is converted to useful output power.
Given that the total input power is 600 W and the blender is 70% efficient, we can substitute these values into the equation to find the useful output power:
P_output = 600 W * 0.70
P_output = 420 W
Therefore, the useful output power of the blender is 420 W.
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A car that has a mass of 1,500 kg is turning in a horizontal circle that has a radius of 20 meters. If the coefficient of friction between the car and the ground is 0.6, what is the maximum speed the car can take the turn without skidding?
The maximum speed the car weighing 1500kg and turning in a horizontal circle which has a radius of 20 meters can take the turn without skidding at 10.84m/s.
What is Maximum speed?Maximum speed is the highest rate of speed that can be attained. Acceleration is the velocity, and because velocity has both a magnitude and direction associated with it, the acceleration changes when an object change the magnitude of their motion, the direction of their motion, or both of these.
Radius of the circular path, r = 20 m
Mass of the car, M = 1500 kg
Maximum speed of the car = v
The coefficient of friction, μ = 0.6
The centrifugal force will balance the friction force so that the car does not slip.
Therefore, mv²/r = μmg
v²/r = μg
v² = μgr
v = √(μgr)
v = √(0.6 × 9.8 × 20)
v = √(117.6)
v = √(294,000)
v = √(117.6)
v = 10.84m/s
Therefore, the maximum velocity of the car is 10.84 meter per second.
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an electron and a proton are placed close to each other. what is the direction of the electric field due to these charges at some point a great distance from them? an electron and a proton are placed close to each other. what is the direction of the electric field due to these charges at some point a great distance from them? the electric field points away from the electron and the proton. the electric field points toward the electron and the proton. the electric field is zero.
The electric field due to these charges at some point a great distance from them is zero.
What is electric field?Electric field is a physical field created by a static electric charge or a changing electric charge. It is a vector field that exerts force on other charged particles. Electric fields are created when electric charges are separated, and the strength of the field is determined by the amount of charge and the distance from the charge.
This is because the electric field from an individual charge is inversely proportional to the square of the distance from it, and so the electric field from the two charges cancel each other out when the distance is greater than the separation between the electron and proton.
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if these objects roll without slipping down a ramp, which one will reach the bottom of the ramp first? multiplechoice : 1) there is not enough information to determine 2) object b 3) object a 4) they will reach the bottom at the same time.
There is not enough information to determine which object will reach the bottom of the ramp first. So option 1 is correct.
Without knowing the mass, radius, and coefficient of friction of the objects and the angle of the ramp, we can't determine which object will have the greater acceleration and thus reach the bottom of the ramp first.
To determine which object will reach the bottom of the ramp first, we need to know the acceleration of each object. The acceleration of an object is determined by the net force acting on it.
Which in turn is determined by the gravitational force acting on the object and the frictional force acting on it.
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what tool uses sound waves to measure the distance of an object
A tool that uses sound waves to measure the distance of an object is called a sonar device.
What do you mean by Sonar Device?A sonar device is a tool that uses sound waves to measure the distance or detect the presence of objects underwater. The device sends out a high-frequency sound pulse that travels through the water and bounces back to the device after hitting an object. By measuring the time it takes for the sound wave to return, the device can determine the distance to the object and generate an image of the underwater environment. Sonar technology is widely used in applications such as navigation, fishing, and search and rescue operations.
Sound waves are a type of mechanical wave that travels through a medium, such as air, water, or solids, and is generated by the vibration of an object. The vibration creates a compression and rarefaction of the medium, which then spreads out as a wave. When these waves reach the ear, they are interpreted by the brain as sound. The speed of sound in a given medium depends on the properties of that medium, such as density and temperature.
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a net force of 5.0 x 102 n causes an object to accelerate at a rate of 5.0 m/s2. what is the mass of the object?
The mass of the object is: 100 kg
What is force?It is the physical magnitude that expresses the effort necessary to move the mass of one kilogram with an acceleration of one meter per second squared, this is expressed in units of the international system in Newton.
To solve this exercise, the formula and procedure to be applied is:
F = m * a
Where:
m = massF = Forcea = accelerationInformation about the problem:
m = ?F= 5.0x 10^2 n1 N = kg * m/s²a= 5.0 m/s²Applying the force formula and isolating the mass, we get:
F = m * a
m= F/a
m= 5.0x 10^2 n /5.0 m/s²
m= 100 kg
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technically a geosynchronous satellite is one that orbits the earth once per sidereal day, which is 23.93 hours, not 24 hours. why is this? and how much difference will it make to the altitude of the satellite
Geosynchronous satellite makes a round around the earth in 29.93 hours. It makes a difference of 36000 km difference in the altitude.
Geosynchronous satellites are those that remains stationery with respect to a place. This is because their time period to complete a cycle is 23.93 hours, that is exactly the same as the rotation period of the earth. So the satellite appears stationery. The velocity of the geosynchronous satellite around the earth is 3.07 km/s or 3070 m/s.
GMm/(R+h)² = mv²/(R+h)
GM/v² = (R+h)²
Where R is the radius of the earth = 6.37 × 10⁶ m, h is the altitude of the satellite above the earth, and M is the mass of the earth that is 6 × 10²⁴ kg, G = 6.67 × 10⁻¹¹ Nm²/kg²
(6.67 × 10⁻¹¹ ×6 × 10²⁴)/(3070)² = (R+h)
(R+h) = 42461989 m
6.37 × 10⁶ + h = 42461989
h = 42461989 - 6.37 × 10⁶
h = 36.09 × 10⁶ m
h = 36000 km.
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how many times more intense is the least intense perceptible sound at 100 hz compared to the least intense perceptible sound at 1000 hz ? specifically, you are looking for the ratio i100hz/i1000hz .
The ratio i100hz/i1000hz is 1000, meaning that the least intense perceptible sound at 100 Hz is 1000 times more intense than the least intense perceptible sound at 1000 Hz.
What is intense?Intense is an adjective describing something that is extreme or powerful, either in terms of strength, emotion, or concentration. It can refer to a feeling, such as intense emotion, or a physical sensation, such as intense pain.
The least intense perceptible sound at 100 Hz is about one millionth of a Pascal, while the least intense perceptible sound at 1000 Hz is about one billionth of a Pascal. Therefore, the ratio i100hz/i1000hz is 1000, meaning that the least intense perceptible sound at 100 Hz is 1000 times more intense than the least intense perceptible sound at 1000 Hz.
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a ball thrown at a brick wall bounces directly back with the same speed it had when it struck the wall. has the velocity of the ball changed? explain.
Yes, the velocity of the ball has changed as it changed its direction from hitting the wall and after it struck the wall.
Speed is a scalar which means it has magnitude but not the direction. Velocity, on the other hand, is a vector with both magnitude and a direction. As the speed of two cars may be the same, if they are heading to different directions, then their velocity are not identical.
The velocity of he ball has changed. Let's call that the initial direction positive, when the ball was going towards the wall, its velocity is positive +V. But when it bounces directly back, the direction is now is negative -V. The direction of the velocity has changed, even though the magnitude has not.
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Electromagnetic waves transfer energy from one ____ to ____ ?
two objects are thrown from the top of a tall building and experience no appreciable air resistance. one is thrown up, and the other is thrown down, both with the same initial speed. what are their speeds when they hit the street?two objects are thrown from the top of a tall building and experience no appreciable air resistance. one is thrown up, and the other is thrown down, both with the same initial speed. what are their speeds when they hit the street?they are traveling at the same speed.the one thrown down is traveling faster.the one thrown up is traveling faster.
The speed when they hit the street will be equal to each other.
What is Air resistance?Air resistance and gravity are the two fixed forces of nature which move on any object on Earth. For example, when a plane flies through the air, the air particles are pressing against the aeroplane, making it harder for the aircraft to move. When you see a feather fall, it is greatly affected by air resistance.
What is Gravity ?A force applied to all bodies on Earth is Weight ( W ), which is caused by Earth's gravity. If a body is free falling, its only acceleration is g , gravity. So gravity increases velocity. Both objects will show a change in their velocities because of gravity.
The velocity for both objects if one is thrown up and other is thrown down is same which is given by this formula:
where,
v= final velocity,
v₀= initial velocity,
h is the difference in height between building and street and g= acceleration due to gravity.
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if the distance between atoms in a solid is 175 pm, what velocity must an electron have so that its de broglie wavelength is equal to that distance? what velocity must an ar atom have so that its de broglie wavelength is equal to that distance?
When this problem is solved, we will arrive at the value 72741 to 4 meters per second.
In simple terms, what would you call distance?An object's total, directionless motion is measured in terms of distance. Distance may also be referred to as the amount of ground covered by an element, depending on the starting or finishing point.
Distance calculations' objectiveBy calculating its distance, we can determine an object's actual size. One can measure the space that an object takes up above us. Its true size can be determined after we know how far away it is. As you get further away, something gets smaller.
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a spring has a force constant of 100 n/m and an unstretched length of 0.07 m. one end is attached to a post that is free to rotate in the center of a smooth table, as shown in the top view above. the other end is attached to a 1 kg disc moving in uniform circular motion on the table, which stretches the spring by 0.03 m. friction is negligible. 10. what is the centripetal force on the disc? (a) 0.3 n (b) 3n (c) 10 n (d) 300 n (e) 1,000 n 11. what is the work done on the disc by the spring during one full circle?
In a circle at constant speed, the work done is zero since the Force is always perpendicular to the distance moved as you move incrementally around the circle.
What is uniform circular motion?An object moves in a circle at a consistent speed in a motion known as uniform circular motion. Any point on a propeller, for instance, that is rotating continuously, is moving uniformly in circles. The second, minute, and hour hands on a watch are some further examples. It is amazing that despite the constant rotation rate, points on these revolving objects are actually speeding. We must consider the motion in terms of vectors in order to see this.
A centripetal motion is an Objects having a constant speed have zero acceleration in one-dimensional kinematics. In two- and three-dimensional kinematics, a particle can experience acceleration even if its speed is constant if it follows a curved trajectory, like a circle.
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A heat engine has a thermal efficiency of 0. 46. During each cycle, it absorbs 780 J of heat from a high-temperature reservoir. How much waste heat does it discard each cycle.
A) 420 J
B) 200J
C) 780 J
D) 360 J
There is a thermal efficiency of 0.46 for a heat engine. With each cycle, it absorbs 780 J of heat from the high-temperature storage. B) 200 J waste heat it discard each cycle.
The thermal efficiency of a heat engine is defined as the ratio of the work output to the heat input, so in this case, the thermal efficiency is 0.46. Therefore, the work output is 0.46 * 780 J = 360 J.
The waste heat discarded each cycle is the difference between the heat input and the work output, so 780 J - 360 J = 200 J.
How much useful work does the heat engine perform in each cycle?
The useful work that the heat engine performs in each cycle can be determined by using the formula: thermal efficiency * heat absorbed = useful work. In this case, the thermal efficiency is 0.46, and the heat absorbed is 780 J.
Therefore, the useful work done by the engine is 0.46 * 780 J = 360 J.
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which of the following statements about forces is false? group of answer choices forces change the momentum of a body forces always occur in equal and opposite pairs where there is no force, objects continue to move the way they were moving there are places on earth where all forces are absent forces cause an acceleration to take place
The statement that is false is "there are places on earth where all forces are absent." Forces, such as gravity, are always present on Earth.
All the given statements are true except the statement "there are places on earth where all forces are absent." is false.
Forces change the momentum of a body,forces always occur in equal and opposite pairs (Newton's third law), where there is no force, objects continue to move the way they were moving, and forces cause an acceleration to take place are all true statements about forces.
Newton's third law simply states that there is an equal and opposite reaction to every action. So, if object A exerts a force on object B, object B will exert an equal but opposite force on object A.
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in a thundercloud there may be electric charges of 35.0 c near the top of the cloud and -35.0 c near the bottom of the cloud. these charges are separated by 2.20 km. what is the electric force on the top charge? magnitude
The magnitude of electric force is [tex]2.27 * 10^{6} N[/tex] (downwards)
We know that electric force between two charges is given by equation:
F = [tex]\frac{k.q_{1} .q_{2} }{r^{2} }[/tex]
Where,
k = constant = [tex]9 * 10^{9} Nm^{2} /C^{2}[/tex]
q1 = first charge =35 C
q2 = second charge = -35 C
r = distance between them = 2.2 km = 2200m
Putting these values in above equation we get:
F = -[tex]2.27 * 10^{6} N[/tex] , where negative sign denotes the direction.
So, the magnitude of electric force is [tex]2.27 * 10^{6} N[/tex] (downwards)
According to Coulomb’s law, the force of attraction or repulsion between two charged bodies is directly proportional to the product of their charges and inversely proportional to the square of the distance between them. It acts along the line joining the two charges considered to be point charges. The law is applicable only for the point charges at rest.To know more about electrostatics visit:
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