U7 WS 5: Intro to Rotation Motion 1. The blades in a blender rotate at a rate of 6500 rpm. When the motor is turned off during the operation, the blades show to rest in 40 s. What is the angular acceleration as the blades slow down? 2. A grinding wheel .35m in diameter rotates at 2500 rpm. a. Calculate the angular velocity in rad/s. b. What are the linear speed and acceleration of a point on the edge of the grinding wheel? 3. A rotating merry go round makes one complete revolution in 4s. a. What is the linear speed of a child seated 1.2 m from the center? b. What is her acceleration? 4. How fast in rpm must a centrifuge rotate if a particle 7cm from the axis off rotation is to experience an acceleration of 100,000 g's? One g is 9.8 m/s2