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.

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.

A body is kept on a horizontal disc of radius 2 m at a distance of 1 m from the centre . The coefficient of friction between the body and the surface of disc is 0.4. The speed of rotation of the disc at which the body starts slipping is (g=10 m//s^2 )

A coin kept on a horizontal rotating disc has its centre at a distance of 0.25 m from the axis of rotation of the disc. If mu is 0.2, then the angular velocity of the disc at which the coin willslip off, is

A coin is placed on a rotating platform at distance V from its axis of rotation.To avoid the skidding of coin from rotating platform, the maximum angular velocity omega is

A coin placed on a gramophone record rotating 100/3 rpm flies off when it is placed at a distance greater than 16 cm from the axis of rotation, if the gramophone record is rotating at 200/3 then its distance from the axis of rotation is

Three particles of masses1kg, 2 kg and 3 kg are at distances 1 m, 2 m and 3 m from the axis of rotation. The moment of inertia of the system is

A disc rotates horizontal at the rate of 100 rpm and M.I. of the disc about the axis of rotation is 1 kg m^2 . If a blob of molten wax weighing 50 gm drops gently at a distance 20 cm from the axis of rotation of the disc and remains stuck to it, then the increase in moment of inertia of the system will be

A horizontal disc is freely rotating about a vertcal axis passing through its centre at the rate of 125 r.p.m. A blob of wax of mass 50 gm falls on it and sticks to it at a distance of 10 cm from the axis. If the reslting frequency of rotation is 75 r.p.m, calculate the moment of inertia of the disc.

A coin placed on a rotating table just slips when it is placed at a distance 4 r from the centre, on doubling the angular velocity of the table, the coin will just slip now the coin is at a distance from centre is

A block A of mass m_(1) rests on a horizontal table. A light string connected to it passes over a frictionless pulley at the edge of table and from its other end another block B of mass m_(2) is suspended. The coefficient of knetic friction between the block and table is mu_(k) . When the block A is sliding on the table, the tension in the string is.