7. The rotor of an centrifuge rotates at 50,000 rpm (revolutions per minute). The top of the 4.00 cm long test tube is 6.00 cm from the center of rotation. The bottom of the tube is 10.0 cm away from the center. Find the centripetal acceleration for the top and bottom of the tube. 8. The Hammer Throw combines circular motion and projectile motion. Consider just the circular motion for this problem. Assume that the distance from the center of rotation (where the athlete is) to shoot on the end of a cable is 1.8 m. If the athlete spins twice every second, what will be the velocity of the shot during the spin? What will be the acceleration the athlete provides to the shot