1. a certain cd has a playing time of 74 minutes. when the music starts, the cd is rotating at an angular speed of 4.70×10(2) revolutions per minute (rpm). at the end of the music, the cd is rotating at 2.40×10(2) rpm. find the magnitude of the average angular acceleration of the cd. express your answer in rad/s².
2.the pedals of a bicycle rotate in a circle with a diameter of 40 cm. what is the maximum torque a 64-kilogram rider can apply by putting all of her weight on one pedal?