A 120-lb student races up stairs with a vertical height of 5.4 m in 6.5 s...
A 120-lb student races up stairs with a vertical height of 5.4 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
_______w
Homework Answers
mass = 120 lb
= 120*0.4536 Kg
= 54.43 Kg
Now use:
Energy = m*g*h
= 54.43 Kg * 9.8 m/s^2 * 5.4 m
= 2880 J
use:
power = energy / time
= 2880 J / 6.5 s
= 443 w
Answer: 4.4*10^2 w
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