8. A man is travelling at 25 m/s on the edge of a centrifuge device used for testing astronauts and fighter pilots. If the arm is 20 m long, what is the angular speed of the centrifuge in rpm? 9. A pulley in an Atwood's machine is accelerating at 5 51. If the radius of the pulley is 25 cm, how fast are the attached blocks accelerating on their ropes? 10. Some kids are twirling a buddy:r on a merrygo~round in a local playground. If they are holding the handle and running along the edge at 4 m/s, and the merry~go~round is 2.0 m in radius, what is the angular acceleration of the merrygo~round