Home
Class 12
PHYSICS
A horizontal disk is rotating with angul...

A horizontal disk is rotating with angular velocity `omega` about a vertical axis passing through its centre. A ball is placed at the centre of groove and pushed slightly. The velocity of the ball when it comes out of the groove -

A

`(sqrt3)/(2)omegaR`

B

`(omegaR)/(2)`

C

`omegaR`

D

`(omegaR)/(sqrt2)`

Text Solution

Verified by Experts

The correct Answer is:
A
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • NTA JEE MOCK TEST 56

    NTA MOCK TESTS|Exercise PHYSICS|25 Videos

  • NTA JEE MOCK TEST 58

    NTA MOCK TESTS|Exercise PHYSICS|25 Videos

Similar Questions

Explore conceptually related problems

A horizontal disc is rotating about a vertical axis passing through its centre. If an insect moves from centre to rim then the angular momentum of the system

A horizontal disc is rotating about a vertical axis passing through its centre. If an insect moves from centre to rim then the angular momentum of the system

Knowledge Check

  • A rod is rotating with angular velocity omega about axis AB. Find costheta .

    A
    `g/(2lomega^2)`
    B
    `g/(lomega^2)`
    C
    `(2g)/(lomega)^2`
    D
    `(3g)/(2lomega^2)`

  • A disc of mass m and radius r is rotating with angular velocity, on a frictionless horizontal plane about a vertical axis passing through its centre. A ring of same mass and radius is gently placed on it in such a way that centres of both coincide. After some time it is found that both attain a common angular velocity

    A
    If we consider disc and ring in a single system then its angular momentum is conserved.
    B
    `omega=(omega_(0))/(3)`
    C
    Loss in K.E. is double to that of final K.E. of the system
    D
    Loss in K.E. is 2/3 of initial K.E. of the system.

  • A copper ball of mass m = 1 kg with a radius of r = 10 cm rotates with angular velocity omega = 2 rad//s about an axis passing through its centre. The work should be performed to increase the angular velocity of rotation of the ball two fold is.

    A
    `1.2 xx 10^-2 J`
    B
    `2.4 xx 10^-2 J`
    C
    `3.6 xx 10^-2 J`
    D
    `4.8 xx 10^-2 J`

    • Similar Questions

    Explore conceptually related problems

    A particle of mass m is placed over a horizontal circular table rotating with an angular velocity omega about a vertical axis passing through its centre. The distance of the object from the axis is r . Find the force of friction f between the particle and the table.

    A horizontal disc rotates freely with angular velocity omega about a vertical axes through its centre. A rig having the same mass and radius as the disc, is now gently placed coaxially on the disc. After some time, the two rotate with a common angular velocity. then.

    A charge q is unifromly distributed over the volume of a unifrom ball of mass m and radius R which rotates with an angular velocity omega about the axis passing through its centre. Find the respective magnetic moment and its ratio to the mechanical moment.

    An ice block is in a trough which is rotating about vertical axis passing through its centre. When ice melts completely, the angular velocity of the system

    A horizontal platform is rotating with uniform angular velcity around the vertical axis passing through its centre. At some instant of time a viscous fluid of mass m is dropped at the centre and is allowed to spread out and finally fall. The angular velocity during this period :

    Home
    Profile