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Question
Compare the power at which each of the following is moving upwards against the force of gravity? (given g = 10 m s–2)
a 250 g squirrel climbing up on a tree at a rate of 0.5 ms–1.
Solution
Mass of squirrel, ms = 250 g = 0.25 kg
Speed, vs = 0.5 m s−1
Force of gravity on squirrel,
Fs = msg = 0.25 x 10
= 2.5 N
Power, Ps = Fs.vs
= 2.5 N × 0.5 ms−1
= 1.25 W
Hence, the squirrel exerts more power in climbing than a butterfly exerts in flying at the same rate.
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RELATED QUESTIONS
A tennis ball is thrown up and reaches a height of 4.05 m before coming down. What was its initial velocity? How much total time will it take to come down? Assume g = 10 m/s2?
Compare the power at which each of the following is moving upwards against the force of gravity? (given g = 10 m s–2)
a butterfly of mass 1.0 g that flies upward at a rate of 0.5 ms–1.
