Chapter 9, Problem 9.87P

DATA A technician is testing a computer-controlled, variable-speed motor. She attaches a thin disk to the motor shaft, with the shaft at the center of the disk. The disk starts from rest, and sensors attached to the motor shaft measure the angular acceleration of the shaft as a function of time. The results from one test run are shown in Fig. P9.87: (a) Through how many revolutions has the disk turned in the first 5.0 s? Can you use Eq. (9.11)? Explain. What is the angular velocity, in rad/s, of the disk (b) at t = 5.0 s; (c) when it has turned through 2.00 rev?

Figure P9.87