Question

A child hangs a steel plate with the help of a string in vertical plane. The child fires bullet on this plate by a toy-gun. If mass of each bullet be 2 g and it strikes the plate with the velocity of 11 ms^-1 and returns back with same speed, then how much force is acting on the plate? The child is firing the bullets at the rate of 3 bullets per second.

Answer 1

Average force applied on the plate,

F = Rate of change of momentum

= 24 x m x n

= 2 x 11 x \(\frac{2}{1000}\) x 3

= 0.132 N