A body starts rotating from rest and completes 10 revolutions in 4 s. Find its angular acceleration.

If a body starts rotating from rest due to a torque of 1.5 Nm, thenits kinetic energy afterit completes 20 revolutions will be

A body moves with a uniform speed along the circumference of a circle of radius 7 m, If it completes one revolution in 11 s, find its speed.

A person stands on a uniformly rotating turn table with outstretched arms holding two identical weights. The moment of inertia of the system is 60 kgm^2 . When he brings the arms close to his body, the M.I. of inertia reduces to 58 kgm^2 . The angular speed of the system now becomes 3 rad s^-1 . Find the initial angular speed and the final K.E.

The upper half of an inclined plane with inclination phi is perfectly smooth while the lower half is rough. A body starting from rest at the top will again come to rest at the bottom if the coefficient of friction for the lower half is given by

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 body starts from rest and moves with an acceleration of 2 m//s^(2) . Find the distance covered by the body in the 10th second of its motion. [[Hint : Distance covered in the 10th second = distance covered in 10 s — distance covered in 9 s]

A body of mass m is suspended from a string of length l. What is minimum horizontal velocity that should be given to the body in its highest position so that it may complete one full revolution in the vertical plane with the point of suspension as the centre of the circle.

The energy required to move a body of mass 10 kg from the ground to 5 m is 490 J. Find the acceleration due to gravity on the body.

A wheel of moment of inertia 2 kg m^2 is rotating about an axis passing through centre and perpendicular to its plane at a speed 60 rad//s . Due to friction, it comes to rest in 5 minutes. The angular momentum of the wheel three minutes before it stops rotating is