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A particle or mass m is moving with spee...

A particle or mass m is moving with speed u in a direction in a which makes `60^(@)` with respect to x axis to x axis . It undergoes elastic collision with the well . What is the change in momentum in x and y direction?

A

`Deltap_(x)`=-mu ,`Deltap_(y)`=0

B

`Deltap_(x)`=-2mu, `Deltap_(y)`=0

C

`Deltap_(x)`=0,`Deltap_(y)`==mu,`Deltap_(y)`=0

D

`Deltap_(x)`=mu,`Deltap_(y)`=0

Text Solution

Verified by Experts

The correct Answer is:
b
The change in momentum of the moleculein x direction
`Deltap_(x)`=final momentum - collision =-mu-mu=-2mu
The change in momentum of the molecule in Y direction `Deltap_(y)=0`
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Knowledge Check

  • A particle of mass m is moving with speed u in a direction which makes 60^(@) with respect to x axis. It undergoes elastic collision with the wall. What is the change in momentum in x and y direction ?

    A
    `Deltap_(x)=-"mu",Deltap_(y)=0`
    B
    `Deltap_(x)=-2"mu",Deltap_(y)=0`
    C
    `Deltap_(x)=0,Deltap_(y)=`mu
    D
    `Deltap_(x)=`mu, `Deltap_(y)=0`

  • A mass M is moving with a constant velocity along a line parallel to the x-axis away from the origin. Its angular momentum with respect to the origin:

    A
    zero
    B
    remains constant
    C
    goes on increasing
    D
    goes on decreasing

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