the rotational inertia of a disk about its axis is .70 kgmsquared. when a 2.0 kg

Question

the rotational inertia of a disk about its axis is .70 kgmsquared. when a 2.0 kg weight is added to its rim, .4 m from theaxis the rotational inertia becomes? a thin circular hoop of mass 1.0 kg and radius 2.0m isrotating about an axis through its center and perpendicular to itsplane. it is slowing down at a rate of 7 rad/s squared. the nettorque acting on it is? detailed answer gets lifesaver rating the rotational inertia of a disk about its axis is .70 kgmsquared. when a 2.0 kg weight is added to its rim, .4 m from theaxis the rotational inertia becomes? a thin circular hoop of mass 1.0 kg and radius 2.0m isrotating about an axis through its center and perpendicular to itsplane. it is slowing down at a rate of 7 rad/s squared. the nettorque acting on it is? detailed answer gets lifesaver rating

Explanation / Answer

Rotational inertia of the disk I = 0.7 kg m ^ 2 mass m = 2 kg distance r = 0.4 m new rotational inertia I ' = I + mr ^ 2                                     = 0.7 + 0.32                                      =1.02 kg m ^ 2 (b). mass m = 1 kg radius r = 2 m rate of slow = 7 rad/s squared Net torque acting on it =I                                  = mr ^ 2 *                                  = 28 N m

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