Below are sketched two identical disks, each with a pair of strings attached to

Question

Below are sketched two identical disks, each with a pair of strings attached to their perimeters The same magnitude force F is applied to each string. For which disk is the applied net torque equal to zero? John is applying a torque of 25 [m N] to rotate a wheel on an axle that is not frictionless. The wheel's moment of inertia is 5 [kg m2]. If his effort results in the wheel accelerating at only 3 [rad / s2], then the frictional torque opposing John is: 3 [m N] 5m [m N] 10 [m N] 20 [m N] A solid sphere of moment of inertia I = 3 [kg m2] is rotating at the angular speed omega = 2 [rad/s]. What are the rotational kinetic energy and angular momentum of the sphere? (As always, do not forget to include units.) KE = L =

Explanation / Answer

Answer:
1 ) A

2 ) C [10 Nm]

3 ) KE = 6 J ; L = 6 Kgm^2 s^-1

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