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Average power output of man

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1. A man pushes a 100 kg box across a level floor at a constant speed of 2.0 m/s for 10 s. If the coefficient of friction between the box and the floor is 0.20, find the average power output by the man.

2. The bird perched on the swing has a mass of 52.0 g and the base of the swing has a mass of 253 g. Assume that the swing and the bird are originally at rest and that the bird takes off horizontally at 2.00 m/s. If the base can swing freely (no friction), how high will the base of the swing rise above its original level?

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The expert determines the average power output of man.

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1. A man pushes a 100 kg box across a level floor at a constant speed of 2.0 m/s for 10 s. If the coefficient of friction between the box and the floor is 0.20, find the average power output by the man.
Solution:

N 2 m/s

P

f = μN mg

Frictional force on the box f = μN = μmg = 0.2 x 100 x 9.8 = 196 N
As the box has zero acceleration, net force on it must ...

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