Starting from rest, a 12-cm-diameter compact disk takes 2.7 s to reach its operating angular velocity of 1900 rpm.
Starting from rest, a 12-cm-diameter compact disk takes 2.7 s to reach its operating angular velocity of 1900 rpm.
Assume that the angular acceleration is constant. The disk’s moment of inertia is 2.5×10^−5kgm^2
.Part A
How much torque is applied to the disk?Part B
How many revolutions does it make before reaching full speed?