Home
Class 12
PHYSICS
If n balls hit elastically and normally ...

If n balls hit elastically and normally on a surface per unit time and all balls of mass m are moving with same velocity u, then force on surface is

A

`mnu^(2)`

B

2mnu

C

`(1//2)mnu^(2)`

D

`2mnu^(2)`

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Similar Questions

Explore conceptually related problems

A surface is hit elastically and normally by n bals per unit time, all the balls having the same mass m, and moving with the same velocity v. then the force acting on surface is

A circular disc of mass '2m' and radius '3r' is resting on a flat frictionless surface. Another circular disc of mass m and radius '2r', moving with a velocity 'u'. hits the first disc as shown in the figure. The collision is elastic. What is the magnitude of normal component of final velocity of the smaller disc'?

A uniform rod of mass m and length L is at rest on a smooth horizontal surface. A ball of mass m, moving with velocity v_0 , hits the rod perpendicularly at its one end and sticks to it. The angular velocity of rod after collision is

A heavy ball of mass 2M moving with a velocity v_(0) collides elastically head on with a cradle of three identical ball each of mass M as shown in figure. Determine the velocity of each ball after collision.

The viscous force acting on a solid ball of surface area. A moving with terminal velocity v is proportional to

A ball after falling a distance of 5 meter rest hits elastically the floor of a lift and rebounds. At the time of impact the lift was moving up with a velocity of 1m/sec. The velocity with which the ball rebounds just after impact is : (g=10m//sec^(2))

A circular disc of mass '2m' and radius '3r' is resting on a flat frictionless surface. Another circular disc of mass m and radius '2r' , moving with a velocity 'u' . hits the first disc as shown in the figure. The collision is elastic. What is the tangential component of final velocity of the smaller disc?

A circular disc of mass '2m' and radius '3r' is resting on a flat frictionless surface. Another circular disc of mass m and radius '2r' , moving with a velocity 'u' . hits the first disc as shown in the figure. The collision is elastic. What is the final velocity of the heavier disc?

A rod of mass m and length l is kept on a surface that has no friction. If a ball comes & hits the lower end with a velocity v, then the velocity of centre of mass will be

A stick of length L and mass M lies on a frictionless horizontal surface on which it is free to move in any way. A ball of mass m moving with speed v collides elastically with the stick as shown in the figure. If after the collision the ball comes to rest, then what would be the mass of the ball?