compare the power at which each of the following is moving upward against force of gravity
(a) a butterfly of mass 1gm that flies upwards at rate of 0.5m/s
(b) a 250gm squirrel climbing a tree at rate of 0.5m/s
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(i) Power = mg × velocity, g = 10 m s–2 = 1/1000 ×10× 0.5W 1000
= 0.5 W
=0.5/100 W
= 5 x 10-3
(ii) Power = 250/1000 ×10× 0.5 W
= 1/ 4x10x0.5
= 1.25 W
Hence, the power with which the squirrel is climbing is much higher than that of a butterfly flying
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