During the lanuch from a board, a diver's angular speed about her centre of mass changes from zero to 6.20 rad/s in 220 ms. Her rotational inerita about the centre of mass is `"12.0 kg-m"^2`. During the launch, what is the magnitude of :
the average external torque acting on her from the board ?

During the lanuch from a board, a diver's angular speed about her centre of mass changes from zero to 6.20 rad/s in 220 ms. Her rotational inerita about the centre of mass is "12.0 kg-m"^2 . During the launch, what is the magnitude of : her average angular acceleration

A horizontal platform in the shape of a circular disk rotates on a frictionless bearing about a vertical axle through the centre of the disk. The platform has a mass of 150 kg , a radius of 2.0 m , and a rotational inertia of 300 kg m^2 about the axis of rotation. A 60 kg student walks slowly from the rim of the platform toward the centre. If the angular speed of the system is 1.5 rad//s when the student starts at the rim, what is the angular speed when she is 0.50 m from the centre ?

The angular momentum of a flywheel having a rotational inertia of 0.140kg*m^(2) about its central axis decreases from 3.00 to 0.800kg*m^(2)//s in 1.50 s. (a) What is the magnitude of the average torque acting on the flywheel about its central axis during this period? (b) Assuming a constant angular acceleration, through what angle does the flywheel turn? ( c) How much work is done on the wheel? (d) What is the average power of the flywheel?

A thin rod of mass 'm' and length 2L is made to rotate about a normal axis through centre of rod. If its angular velocity changes from 'O' to 'omega' in time 't'. The torque acting on it is

A student is standing on the edge of a stationary turntable,made from a uniform disc of mass M and radius R on a frictionless bearing at its center.She starts to run with speed v around the perimeter of the table.This is her speed relative to the ground - not the turntable).If her mass is m , what is the magnitude of the angular velocity of the turntable. (relative to the ground)?

The angular momentum of a flywheel having a moment of inertia of 0.4 kg m^(2) decreases from 30 to 20 kg m^(2)//s in a period of 2 second. The average torque acting on the flywheel during this period is :