First slide

Power

Question

From an automatic gun a man fires 360 bullet per minute with a speed of 360 km/hour. If each weighs 20 g, the power (in W) of the gun is

Moderate

Solution

Power of gun $= \frac{Total K.E. of fired bullet}{time}$
$= \frac{n \times \frac{1}{2} {mv}^{2}}{t} = \frac{360}{60} \times \frac{1}{2} \times 2 \times 10^{- 2} \times {(100)}^{2} = 600 W$

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