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

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

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 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 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.

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 :

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.