Work Energy And Power Question 201

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 of the gun is [Pb. PET 2003]

Options:

A) $ 600W $

B) $ 300W $

C) $ 150W $

D) $ 75W $

Show Answer

Answer:

Correct Answer: A

Solution:

Power of gun $ =\frac{\text{Total K}\text{.E}\text{. 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}}=600W $



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