Kinetic and Potential Energy
Work
Power
Impulse
Momentum
100
How fast is a 55 kg person moving if they have a kinetic energy of 440 J?
4 m/s
100
A 74.5 kg person rides up an elevator for 4.25 m. How much work did the elevator exert on the person?
3103 J
100
150 J of work is done in 12 s by a person. How much power did the person exert?
12.5 J/s
100
Impulse is equal to the change in _____. a) Momentum b) Work c) Kinetic Energy
a) Momentum
100
What are the units of momentum?
kg m/s
200
What is the unit of energy?
Joule
200
What is the unit of work?
Joule
200
If a person wants to exert twice as much power using the same force and the same distance, how should they change the time?
Halve the time.
200
If an object weighing 300 N accelerates to 15 m/s from rest in 4 seconds, what is its impulse?
459.184 kg m/s
200
A person with a mass of 70 kg shoots a gun. The bullet, which has a mass of .005 kg, exits the gun at a speed of 900 m/s. What is the velocity of the person?
-.0643 m/s
300
A ball is dropped from rest from 10 m. What is its velocity the moment before it hits the ground?
14 m/s
300
Of which of the following is work done? a) A person pushes against a box and it doesn't move b) A person holds a box c) A person pushes a box along the ground at an angle of 30 degrees above the horizontal
c) A person pushes a box along the ground at an angle of 30 degrees above the horizontal
300
One person can push a box d meters in t seconds with a force of F. If another person can push the box twice as far in half the time with the same force, how much more power does the second person exert?
4 times as much power
300
If two objects undergo the same force in the same amount of time, but one object has more mass than the other, will the objects have the same impulse?
Yes.
300
A person runs into a stationary person with a speed of 5 m/s. After the collision both people are moving with a speed of 2 m/s. If the first person is 65 kg, what is the mass of the second person (the one that was run into)?
97.5 kg
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