Find the power with which a 250 g squirrel climbing up a tree at a rate of $0.5 m s^{- 1}$ , moves upwards against the force of gravity ? $(g = 10 m s^{- 2})$

1.25 W

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2.5 W

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2 W

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4.5 W

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Solution

The correct option is A 1.25 W
g $= 10 m s^{- 2}$
mass of squirrel m $= 250 g = 0.25 k g$
velocity of squirrel v $= 0.5 m s^{- 1}$
power $= F . v = m . g . v = 0.25 \times 10 \times 0.5 = 1.25 W$

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A boy of mass 40 kg climbs up the stairs and reaches the roof at at height 8 m in 5s.Calculate:

(i) the force of gravity acting on the boy,

(ii) the work done by him against the force of gravity,

(iii) the power spent by the boy.

(Take $g = 10 m s^{- 2}$ ).

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