Home
Class 11
PHYSICS
A set of n identical cubical blocks lies...

A set of n identical cubical blocks lies at rest parallel to each other along a line on a smooth horizontal surface. The separation between the near surfaces of any two adjacent blocks is L . The block at one end is given a speed v towards the next one at time 0 t . All collisions are completely inelastic, then

A

the last block starts moving at `t = (n-1)L)/v`

B

the last block starts moving at `t = (n(n+1)L)/2v`

C

the centre of mass of the system will have a final speed v

D

the centre of mass of the system will have a final speed `v/n`

Text Solution

Verified by Experts

Promotional Banner

Similar Questions

Explore conceptually related problems

A set of a identical cubical blocks lies at rest parallel to each other along a line on a smooth horizontal surface. The separation between the near surface of any two adjacent blocks is L . The block at one and is given a speed v towards the next one at time t = 0 . All collisiona are completely inelastic , then the last block starts moving at

2n identical cubical blocks are kept in a straight line on a horizontal smooth surface. The separation between any two consecutive blocks is same. The odd numbered blocks 1, 3, 5,.....(2n–1) are given velocity v to the right whereas blocks 2, 4, 6,......2n are given velocity v to the left. All collisions between blocks are perfectly elastic. Calculate the total number of collisions that will take place.

A Convex mirror of radius of curvature R is fixed on a standat rest with total mass m which is facing a block of equal mass m as shown in figure and is kept on a frictionless horizontal surfece. The separation between the block and mirror is 2R and block is moving at a speed v toward the mirror. Consider elastic collision between block and stand, find the speed of image after time 3R//v .

A large number of small identical blocks, each of mass m, are placed on a smooth horizontal surface with distance between two successive blocks being d. A constant force F is applied on the first block as shown in the figure (a) If the collisions are elastic, plot the variation of speed of block 1 with time. (b) Assuming the collisions to be perfectly inelastic, find the speed of the moving blocks after n collisions. To what value does this speed tend to if n is very large.

Two identical 5 kg blocks are moving with same speed of 2 m//s towards each other along a frictionless horizontal surface . The two blocks collide , stick together and come to rest. Consider the two blocks as a system . The work done by the external and ijnternal force are respectively:

Three blocks of identical masses are placed on a frictionless table as shown . The centre block is at rest , whereas the other two blocks are moving directly towards the stationary block with identical speed v . The centre block is initially closer to the left block than the right one . All collisions are elastic . After long time , which of the following is true .

A strip of wood mass M and length l is placed on a smooth horizontal surface. An insect of mass m starts from rest at one end of the strip and walks to the other end in time t , moving with a constant speed.

Three identical balls are connected by light inextensible strings with each other as shown and rest over a smooth horizontal table. Length of each string is l . At moment t = 0 , ball B is imparted a velocity v_(0) perpendicular to the strings and then the system is left on its own. If collision between the balls is completely inelastic, then

A small block of mass m and a concave mirror of radius R fitted with a stand lie on a smooth horizontal table with a separation d between them. The mirror together with its stand has a mass m. The block is pushed at t = 0 towards the mirror so that it starts moving towards the mirror at a constant speed V and collides with it. The collision is perfectly elastic. Find the velocity of the image (a) at a time t lt d/V, (b) at a time t gt d/V .