A disc rotates about its aixs of symmetry in a horizontal plane at a steady rate of 3.5 revolutions per second A coin placed at a distance fo 1.25 cm form the axis of ratation remains at rest on the disc The coefficient of friction between the coin and the disc is : `(g=10//s^(2))`

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 just remains on a disc rotating at a steady rate of 180r.p.m .A coin is kept at a distance of 2 cm from the axis of rotationn . The coefficient of fricition between the coin and the disc is _____ [ gg= 9.8 m//s^(2)]

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 disc is rotatin g aro u n d its cen tre in a horizontal plane at the rate of 60 rotation/ minute. A coin (1A^(st)) is placed at a distance of 18 cm and 2^(nd) similar coin 20 cm from its centre. The co-efficient of static friction between the disc and the coins is 0.2. Which coin will be thrown away from the disc ? Which coin will keep rotating with the disc ?

A gramophone disc is set revolving in a horizontal plane at the rate of 33(1)/(2) revolutions per minute. It is found that a small coin placed on the disc will remain there if its centre is not more than 5 cm from the axis of rotation. Calculate the coefficient of friction between the coin and the disc [Hint : Centripetal force = m omega^(2)r= Frictional force = mu N=mu mg ]

A coin placed on a horizontal rotating disc, with its centre at 10 cm from the centre of the disc, is about to slip off when the disc performs 60 rpm. Find the coefficient of friction between the coin and the disc.

A circular disc is made to rotate in horizontal plane about its centre at the rate of 2 rps. The greatest distance of a coin placed on the disc from its centre so that it does not skid is ( mu is coefficient of friction)

A circular disc is made to rotate in horizontal plane about its centre at the rate of 2 rps. The greatest distance of a coin placed on the disc from its centre so that it does not skid is ( mu is coefficient of friction)