v\\; 21. A coin is placed on top of a rotating platform that turns at 30 rpm. if the coefficient of static friction betinreen the coin and the platform ls 0.3, what is the farthest that the coin can be placed from the center of the platform so that It will travel In a circle without slipping as the turntable rotates? (Note that there are 2m meters in one revolutIOn). 22. The turntable in the previous problem is now turned off and comes slowly and uniformly to rest over 8 seconds. How many revolutions did It turn through while It was slowing down? 23. A hockey puck (puck 1] sliding to the right across the ice at a speed of 20 m/s collides with an Identical hockey puck [ puck 2) sliding to the left at a speed of 35 mls. After the collision. puck. 1 ls moving left at a speed of 30 rn/s. What is the velocity of puck 2 (speed and direction please}. after the collision