The mass of a star is 1.61·1031 kg and its angular velocity is 1.60e-7 rad/s. find its new angular velocity if the diameter suddenly shrinks to 0.29 times its present size. assume a uniform mass distribution before and after. icm for a solid sphere of uniform density is 2/5 mr2. 1.90×10-6 rad/s

On a frictionless air track, a blue glider with mass 0.200 kg is moving to the right with a speed of 8.00 m/s. it strikes a red glider that has mass 0.600 kg and that is initially at rest. after the collision, the blue glider is moving to the left with a speed of 3.00 m/s.(a) what are the magnitude and direction of the velocity of the red glider after the collision? (b) is this collision elastic?