Home
Class 12
PHYSICS
A particle of mass 20 g is released with...

A particle of mass `20 g` is released with an initial velocity `5m//s` along the curve from the point A, as shown in the figure. The point A is at height h from point B. The particle slides along the frictionless surface. When the particle reaches point B, its angular momentum about O will be : (Take `g=10m//s^2`).

A

`6kg - m^(2)//s`

B

`3kg - m^(2)//s`

C

`8 kg - m^(2)//s`

D

`2kg - m^(2)//s`

Text Solution

Verified by Experts

The correct Answer is:
A
`mgh = (1)/(2) mv_(B)^(2) - (1)/(2)mv_(A)^(2)`
`rarr v_(B) = 15m//s`
`= mv_(B)(OB) = ((20)/(1000)kg)(15 m//s)(20m) = 6kgm^(2)//s`
Promotional Banner

Topper's Solved these Questions

  • JEE MAIN REVISION TEST - 7|JEE - 2020

    VMC MODULES ENGLISH|Exercise Physics (Section -2) (Numerical Value Type)|5 Videos

  • JEE MAIN REVISION TEST - 4 JEE - 2020

    VMC MODULES ENGLISH|Exercise PHYSICS|25 Videos

  • JEE MAIN REVISION TEST -14

    VMC MODULES ENGLISH|Exercise PHYSICS (SECTON 2)|5 Videos

Similar Questions

Explore conceptually related problems

Two particles are projected with speed 4m//s and 3m//s simultaneously from same point as shown in the figure. Then:

A particle is projected with a velocity 10 m//s at an angle 37^(@) to the horizontal. Find the location at which the particle is at a height 1 m from point of projection.

A particle of mass m=5.00kg is released from point A and it slides on the frictionless track shown in figure. Determine (a) the particle's speed at points B and C and (b) the net work done by the gravitational force as the particle moves from A to C.

Two particle A and B are moving as shown in the figure Their total angular momentum about the point O is

A point particle of mass m is released from a distance sqrt(3)R along the axis of a fixed ring of mass M and radius R as shown in figure. Find the speed of particle as it passes through the centre of the ring.

A particle of mass m is projected with a velocity v making an angle of 45^@ with the horizontal. The magnitude of the angular momentum of the projectile abut the point of projection when the particle is at its maximum height h is.

A particle is moving along a straight line with increasing speed. Its angular momentum about a fixed point on this line :

A particle of mass m is released from point A as shown in the gigure. Would it loop the loop if H=4r? What is the force on the circular track when it is at point (a) B, (b) C?

A particle of mass m moves along line PC with velocity v as shown. What is the angular momentum of the particle about O ?

Find the horizontal velocity of the particle when it reach the point Q. Assume the block to be frictionless. Take g=9.8 m//s^(2) .