A cord of negligible mass in wound round the rim of flywheel of mass 20 kg and radius 20cm mounted on a horizontal axis Calculate the angular acceleration of the wheel if a steady pull of `25N` is applied on the cord. Moment of inertia of flywheel about its axis=`MR^2/2`

A rope of negligible mass is wound round a hollow cylinder of mass 3kg and radius 40cm . What is the angular acceleration of the cylinder if the rope is pulled with a force of 30N ? What is the linear acceleration of the rope ? Assume that there is no slipping.

A circular disc of mass 0.15 kg and radius 0.1 m makes 120 revolutions in one minute about its own axis. Calculate its angular momentum.

A 100 turn closely wound circular cell of radius 10 cm carries a current of 3.2A (a) what is the field at the centre of the coil? (b) What is the magnetic moment of this coil? The coil is placed in a vertical plane and is free to rotate about a horizontal axis which coincides with its diameter. A uniform magnetic field 2 T in the horizontal direction exists such that initially the axis of the coil is in the direction of the field. The coil rotates through an angle of 90^(o) under the influence of the magnetic field (c) What are the magnitudes of the torques on the coil in the initial and final position? (d) What is the angular speed acquired by the coil when it has rotated by 90^(o) ? The moment of inertia of the coil is 0.1 kg m^(2) .

A solid cylinder of mass 20kg rotates about its axis with angular speed 100rad s^(-1) . The radius of the cylinder is 0.25m . What is the kinetic energy associated with the rotation of the cylinder? What is the magnitude of the angular momentum of the cylinder about its axis?

In a hammer throw event, a solid sphere of mass 16 kg is tied to a light 50 cm long chain. A sportsman gives to ita constant moment of 30 N-m for 10 seconds and then throws the sphere. Consider the sphere as a point mass. Find the moment of inertia about the axis of rotation.