An average force of 125 N is applied on a machine gun firing bullets each of mass 10 g at the speed of 250 m s - 1 to keep it in position. The number of bullets fired per second by the machine gun is

Question

An average force of 125 N is applied on a machine gun firing bullets each of mass 10 g at the speed of 250 m s - 1 to keep it in position. The number of bullets fired per second by the machine gun is :

TestHub · Accepted Answer

The formula to calculate the net momentum of the gun and bullet system can be written as

$F = n m v . . . (1)$

Substitute the values of the known parameters into equation (1) and solve to calculate the required number of bullets.

$\begin{array}{rcl} 125 & = & n \times \frac{10}{1000} \times (250) \\ \Rightarrow & n = 50 \end{array}$

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