$A$ machine gun fires a bullet of mass $65 \, g$ with a velocity of $1300 \, m/s$. The man holding it can exert a maximum force of $169 \, N$ on the gun. The number of bullets he can fire per second will be ............

$A$ machine gun can fire $200$ bullets $\min^{-1}$. If $35 \ g$ bullets are fired at a speed of $750 \ m \ s^{-1}$, the average force exerted by the gun on the bullets is, (in $N$)

Figures $I, II, III$ and $IV$ depict the variation of force with time. In which of these situations is the impulse the highest?

The average force necessary to stop a hammer having momentum $50 \ N-s$ in $0.25 \ s$ is ...... $N$.

Why are porcelain objects wrapped in paper or straw before packing for transportation?

$A$ $140\, g$ ball,in horizontal flight with a speed $v_1$ of $39.0\, m/s$,is struck by a bat. After leaving the bat,the ball travels in the opposite direction with speed $v_2 = 39.0\, m/s$. If the impact time $\Delta t$ for the ball-bat collision is $1.20\, ms$,what average net force acts on the ball? (in $N$)