Q. At t = 0 a grinding wheel has an angular velocity of 27.0 rad/s. It has a constant angular acceleration of 32.0 rad/s2 until a circuit breaker trips at t = 2.00 s. From then on, it turns through 432 rad as it coasts to a stop at constant angular acceleration.
Q. Two loudspeakers are placed on a wall 2.00 m apart. A listener stands 3.00 m from the wall directly in front of one of the speakers. A single oscillator is driving the speakers at a frequency of 800 Hz.
(a) What is the phase difference between the two waves when they reach the observer? (Your answer should be between 0 and 2π.)
(b) What is the frequency closest to 800 to which the oscillator may be adjusted such that the observer hears minimal sound?