A fan is rotating at 90rmp. It is then switched OFF . It stops after 21 revolutions. Calculate the time taken by it to stop assuming that the frictional torque is constant.

A ring and a disc of different masses are rotating with the same kinetic energy. If we apply a retarding torque r on the ring and the ring stops after making n revolutions, then in how many revolutions will the disc stop under the same retarding torque ?

Some how, an ant is stuck to the rim of a bicycle wheel of diameter 1 m. While the bicycle is on a central stand, the wheel is set into rotation and it attains the frequency of 2 rev/s in 10 seconds, with uniform angular acceleration. Calculate Time taken by it for first complete revolution and the last complete revolution.

A gramophone twin-table rotating at an angular velocity 3frac(rad)(s) , stops after one revolution. Find the angular retardation.

A flywheel is revolving at 150 revolutions per minute. If it decelerates at a constant rate of 2pi rad//s^2 , then time required to stop it is

A ceilling fan rotates about its own axis with some angular velocity. When the fan is switched off, the angular velocity becomes (1/4)^(th) of the original in time 't' and 'n' revolutions are made in that time. The number of revolutions made by the fan during the time interval between switch off and rest are (Angular retardation is uniform)

Starting from rest a fan takes 5 s to attain the maximum speed of 400 rpm. Assuming constant acceleration, the time taken by the fan in attaining half the maximum speed is

In children's park there was a slide to be made by contract. By mistake, the person who had taken the contract made the coefficient of friction of the slide as high as 1//3 . Now, the fun is that the child expecting to slide down the incline will stop somewhere in between. Find the angle theta with the horizontal at which he will stop on the incline.(Assume negligible frictional losses)