Compare the power at which each of the following is moving upwards against the force of gravity ? `(given g = 10 m//s^2)` (i) a butterfly of mass 1.0 g that flies upward upward at a rate of 0.5 m//s. (ii) a 250 g squirrel climbing up on a tree at a rate of 0.5 m//s.

Explanation

We know that power = `mg xx` spedd
(i) in case of a butterfly of mass 1.0 g flying upwards at the rate of 0.5 m//s,
`power, P_1 = (1.0 xx 10^(-3) kg) (10m//s^2) (0.5 m//s) = 5xx10^(-3) W`
(ii) in case of a squirral of mass 250 g climbing up on a tree at a rate of 0.5 m//s,
power, `P_2 = (250 xx 10^(-3)kg) (10m//s^2) (0.5 m//s) = 1.25 W`
`"Clearly", (P_2)/(P_1) = (1.25 W)/(5xx 10^(-3)W) = 250`
Thus, the power with which the squirrel is climbing is much higher (250 times) then that of the flying butterfly.