Two wheels of moment of inertia `4 kgm^2` rotate side by side of the rate of 120 r.p.m. and 240 r.p.m. respectively in the opposite direction. If now both the wheels are coupled by means of weightless shaft so that both the wheels now rotate with a common angular speed, find the new speed of rotation.

Two wheels of moment of inertia 4 kgm^2 rotate side by side at the rate of 120 rev/min and 240 rev/min respectively in the opposite directions. If now both the wheels are coupled by means of weightless shaft so that the both wheels now rotates with a common angular speed. Find the new speed of rotation.

A wheel of moment of inertia 2 xx 10^3 kg m^2 is rotating at uniform angular speed of 4 rad/s,.then . the torque required to stop it in one second is,

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

A flywheel rotates at a constant speed of 3000 r.p.m. The angle described by the shaft in one second is

A ballet dancer spins about a vertical axis at 2.5pi rad s^-1 with his arms outstretched. With the arms folded, the M.I. about the same axis of rotation changes by 25%.Calculate the new speed of rotation in r.p.m.

A wheel rotates with a constant angular velocity of 300 r.p.m. The angle through which the wheel rotates in one second is

Two identical discs of same radius R are rotating about their axes in opposite directions with the same constant angular speed omega . The discs are in the same horizontal plane. At time t-0, the points P and Q are facing each other as shown in the figure. The relative speed between the two points P and Q is v_r , As a function of time, it is best represented by

A disc of moment of inertia 9.8/(pi^2)kgm^2 is rotating at 600 r.p.m. If the frequency of rotation changes from 600 r.p.m. to 300 r.p.m., then what is the work done? A. 1470J B. 1452J C. 1567J D. 1632J

A coil of 100 turns each of area 0.1 m^2 is rotated at constant speed of 300 r.p.m. in a uniform magnetic field of induction 0.02 Wb//m^2 about an axis in the plane of the coil and perpendicular to the direction of the coil.Calculate the maximum value of induced e.m.f.

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.