SOLUTION: A 133-lb student races upstairs with a vertical height of 5.3 m in 6.5 s to get to a class on the second floor. How much power in watts does the student expend in doing work agains

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Question 1205985: A 133-lb student races upstairs with a vertical height of 5.3 m in 6.5 s to get to a class on the second floor. How much power in watts does the student expend in doing work against gravity? The Answer has to be in Watts.
Answer by ikleyn(53937) About Me  (Show Source):
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A 133-lb student races upstairs with a vertical height of 5.3 m in 6.5 s
to get to a class on the second floor. How much power in watts does the student expend
in doing work against gravity? The Answer has to be in Watts.
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(1)  Convert the mass of 133 lbs to kilograms

        133 lbs  is  0.453592*133 = 60.328 kilograms.


(2)  Calculate the work done

        work = m*g*h = 60.328 kg * 9.81 kg/s^2 * 5.3 m = 3136.634 joules


(3)  Divide the work by the time to determine the power

        power = 3136.634%2F6.5 = 482.56 watts.    ANSWER

Solved.