QUESTION 10 Power, P, is defined as the rate at which work, W, is done, or...
QUESTION 10
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Power, P, is defined as the rate at which work, W, is done, or the work divided by the time, t, over which that work occurs: P = W / t. Starting from rest, at the bottom of a flight of stairs, what is the power output for a person of mass 55 kg who runs up a flight of stairs of height 3.0 m and reaches the top of the stairs, in a time of 3.0 s, with a final speed of 2.0 m/s?
a. 493 J
b. 502 J
c. 576 J
d. 538 J
Homework Answers
Solution:
work done = mgh + 0.5 mv^2
=> w = 55 * 9.8 * 3 + 0.5 * 55 * 2 * 2
=> w = 1727 J
Power = w/t
P = 1727 / 3
=> P = 576 W
option C is right.
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