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1) What is the instantaneous angular velocity if θ(t) = 2 cos(π/4 t) ?

2) If there is no net torque, angular momentum is conserved.
3) What is the torque applied to a wheel by a force of 0.2 N applied tangentially at a radius of 0.5 m?
4) What is the moment of inertia of a disk of radius 0.10 m and mass 2.0 kg?
5) The initial angular velocity of an object is 2.0 rad/s, and the final angular velocity is 1.0 rad/s.   If the initial moment of inertia is 0.5 kg m^2, what is the final moment of inertia, in the absence of net torques?

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