n bullets per sec each of mass m moving with velocity v strike normally on a wall. The collision is elastic then force on wall is-

Two balls each of mass 'm' are moving with same velocity v on a smooth surface as shown in figure. If all collisions between the balls and balls with the wall are perfectly elastic, the possible number of collisions between the balls and wall together is

A molecule of mass m moving at a velocity v impinges elastically on the wall at an angle alpha with the wall. Then

A molecule of mass m moving at a velocity v impinges elastically on the wall at an angle a with the wall. Then

A gun fires N bullets per second, each of mass m with velocity v. The force exerted by the bullets on the gun is :

A gun fires N bullets per second, each of mass m with velocity v. The force exerted by the bullets on the gun is :

A gun fires N ' bullets per second,each of mass m with velocity v .The force exerted by the bullets on the gun is

A molecule of mass m moving with a velocity v makes 5 elastic collisions with a wall of the container per second. The change in its momentum per second will be