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A boby is moving in a room with a vel...

A boby is moving in a room with a velocity of `20m//s` perpendicular to the two walls separated by 5 meters .There is no friction and the collisionnn with the walls are elastic.

A

Not periodic

B

Periodic but not smple harmonic

C

Periodic and simple harmonic

D

Periodic with variable time period

Text Solution

Verified by Experts

The correct Answer is:
B
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Knowledge Check

  • A vessel contains 6xx 10^(26) molecules m ^(-3). Mass of each molecule is 6xx10^(-27) kg. Assume that, on an average, one-sixth of the molecules move with a velocity 10^(3) m/s perpendicularly towards each wall. If the collisions with the walls are perfectly elastic, then which of the following is correct?

    A
    Change in momentum of each molecule is `12xx10^(-24)` kg m/s in each collision
    B
    The number of molecules hitting normally to1 `m ^(2)` of the wall per second is `10^(29)`
    C
    Total change in momentum of all molecules per second is`10^(31)` SI units
    D
    The number of molecules hitting one square metre of the surface is `6xx 10^(29)`

  • A wall moving with velocity 2 cms^(-1) towards the ball and ball is moving towards the wall with a velocity 10 cms^(-1) . It hits the wall normally and makes elastic collision with wall. The velocity of ball after collision with wall in cms^(-1) .

    A
    12
    B
    8
    C
    14
    D
    16

  • A bead of mass m and diameter d is sliding back and forth with velocity v on a wire held between two right walls of length L. Assume that th ecollisions with the wall are perfectly elastic and ther is no friction. The average force that the bouncing bead exerts on the one of the walls is :_

    A
    `(mv^(2))/(L - d)`
    B
    `(mv^(2))/(L + d)`
    C
    `(2mv^(2))/(L - d)`
    D
    `(2 mv^(2))/(L + d)`