Pilots and astronauts are tested for the stresses of flying high-speed aircraft in a spinning quot;human centrifugequot;, a device which spins at...

Pilots and astronauts are tested for the stresses of flying high-speed aircraft in a spinning "human centrifuge", a device which spins at high speed to simulate the effects of high accelerations. If the device, starting from rest, takes 2.1 minutes to turn through 21 complete revolutions before reaching its final speed, what was its angular aceleration (assumed constant)?