Energy of 484 J is spent in increasing the speed of flywheel from 60 rpm to 360 rpm. Find M.O.I. of the wheel.

Moment of inertia of a wheel is 0.004 kg. m^(2) . If its number of revolutions is increased from 60 rpm to 150 rpm in 3 s, determine the magnitude of the torque acting on it.

A small body is kept at a distance of 7 cm from the centre of a gramophone disc. The disc starts rotating with gradually increasing speed and the body is just on the verge of being thrown off when the disc rotates at 60 rpm. What will be the rate of rotation of the disc when the body, kept at a distance of 12 cm from the centre, is just being thrown off?

A wheel completes 400 revolutions in 1 minute. Its speed is increased to 600 rpm in 4 s. Determine the angular acceleration .

A wheel completes 400 revolutions in 1 minute. Its speed is increased to 600 rpm in 4 s. Determine The number of revolutions completed by the wheel in that time.

A cord of negligible mass is wound round the rim of a flywheel of mass 20 kg and radius 20 cm. A steady pull of 25 N is applied on the cord. The flywheel is mounted on a horizontal axis with frictionless bearings Find the kinetic energy of the wheel at this point when 2m of the cord is unwound. Assume that wheel starts from rest.

A stone ,thrown with the same initial speed ,rises 20 m higher when the angle of projection changes from 30^@ to 60^@ . What was the initial speed and the increases in time spent by the stone in air in the second case ?

A rectangular coil of area 20cm times 15cm and of 485 turns is rotating with a speed pf 1800 rpm in a magnetic field of intensity 20Wb .m^-2 .When the coil is inclined at 60^@ with the magnetic field , what will be the induced emf in the coil?