A disc starts rotating with a constant angular acceleration of `1 rad//s^(2)` about a fixed vertical axis perpendicular to its plane and passing through its centre. A coin of mass `10 gm` is placed on the disc at a distance of `10cm` from the axis. The coefficent of friction between the disc and the coin is `0.2`. The value of the frictional force on the coin at `t=1s` will be

At time t = 0 , a horizontal disc starts rotating with angular acceleration 1 red s about an axis perpendicular to its plane and passing through its centre. A small block is lying on this disc at a distance 0.5 m from the centre. Coefficient of friction between the surface of block and disc is 0.255. The block will start slipping on the disc at time t . Which is approximately equal to

At time t = 0 , a horizontal disc starts rotating with angular acceleration 1 red s about an axis perpendicular to its plane and passing through its centre. A small block is lying on this disc at a distance 0.5 m from the centre. Coefficient of friction between the surface of block and disc is 0.255. The block will start slipping on the disc at time t . Which is approximately equal to

A circular disc rotates at 60 rpm about an axis passing through its centre. A coin of 18 g is placed at a distance of 8 cm from the centre of the disc. Calculate the centrifugal force on the coin.

Radius of gyration of disc rotating about an axis perpendicular to its plane passing through its centre is (If R is the radius of disc)

A coin just remains on a disc rotating at 120 r.p.m. when kept at the distance of 1.5 cm from the axis of rotation. Find the coefficient of friction between the coin and the disc.

Radius of gyration of disc rotating about an axis perpendicular to its plane passing through through its centre is (If R is the radius of disc)

A thin metallic disc is rotating with constant angular velocity about a vertical axis that is perpendicular to its plane and passes through its centre. The rotation causes the free electrons in the disc to redistribute. Assume that there is no external electric or magnetic field. Then

A coin of 4 g mass is placed at a distance of 2 cm from the axis of rotation a disc,. If the frequancy of disc is 180 rpm, then the coefficient of friction between the coin at rest and disc will be

A coin kept on a horizontal rotating disc has its Centre at a distance of 0.1 m from the axis of the rotation of the disc. If the coefficient of friction between the coin and disc is 0.25, find the angular speed of the disc at which the coin would be about is slip off.