An average force of is applied on a machine gun firing bullets each of mass at the speed of to keep it in position. The number of bullets fired per second by the machine gun is :

Question

An average force of  is applied on a machine gun firing bullets each of mass  at the speed of  to keep it in position. The number of bullets fired per second by the machine gun is :

Canvas Classes · Accepted Answer

🧠 Recoil Force = Rate of Momentum Carried Away by Bullets

Read the question. A machine gun is being held in position by a force of . Each bullet has mass  and leaves at . The question wants the firing rate.

This is a Newton's second law problem in its momentum form: . The force needed to hold the gun is exactly equal to the rate at which momentum leaves through the bullets. If  bullets are fired per second, then  times the momentum of one bullet equals the holding force.

First concrete move:

More questions from this chapter

More questions from this chapter