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How much power must the legs of a 70-kg man develop in order to run up a staircase 5 m high in 9 seconds?
Wiki User
∙ 12y ago
Work = (force) x (distance) = (mass) x (gravity) x (height) = (70 x 9.8 x 5)
Power = work / time = (70 x 9.8 x 5) / (9) = 3811/9 watts = about 0.51 horsepower.
Actually, that's the rate at which his gravitational potential energy increases
as his altitude increases, but in order to accomplish it, he has to generate
and expend energy significantly faster than that.
Wiki User
∙ 12y ago
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