19 which of the following is the rate at which work

19. Which of the following is the rate at which work is
done?
a. potential energy c. mechanical energy
b. kinetic energy d. power
20. Which of the following equations is not
equation for power, P, in terms of work,
displacement, d, time interval, Δ t, force, F, and/or
velocity, v?
potential energy of 1265 J.
an
W,
21. Which of the following are not units of power?
22. How much power is required to lift a 2.0 kg mass
at a speed of 2.0 m/s?
Solution:
23. What is the average power supplied by a 60.0 kg
person running up a flight of stairs a vertical distance
of 4.0 m in 5 s?
a. 480 W b. 240 W c. 120 W d. 48 W
Solution:
24. Which of the following has the greatest power
output?
25. A more powerful motor can do
26. An object has a mechanical energy of 1575 J and a
potential energy of 1265 J.

WORK-POWER- ENERGY EXTRA CREDIT WORKSHEET
Name:
27. A 5 kg object is moving downward at a speed of 12
m/s. If it is currently 2.6 m above the ground what is
its mechanical energy?
28. Calculate the kinetic energy of a 750 kg compact
car moving at 50 m/s.
29. Julie has a mass of 49 kg. What is her potential
energy when standing on the 6 meter diving board?
(She is 6 meters above the water.) Julie jumps off the
diving board.
a. What is her kinetic energy just before she hits the
water?
b. What is Julie’s speed just as she hits the water?
30. A spring is compressed 10 cm from the rest
position. If the elastic potential energy stored in the
spring is 1.5 J, what is the spring constant?