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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 butterfly of mass 1.0 g that flies upward at a rate of 0.5 ms–1.
Answer in Brief
Solution
Mass of butterfly, mb = 1 g = 10−3 kg
Speed, vb = 0.5 m s−1
Force of gravity on butterfly, Fh = mbg
= 10−3 × 10
= 10−2 N
Power, Pb = Fb. vb
= 10−2 N × 0.5 m s−1
= 0.005 W
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