A phonograph turntable, initially rotating at 0.75 rev/s, slows down and stops in 30 s.The magnitude of its average angular acceleration for this process is:
A wheel initially has an angular velocity of 18 rad/s.It has a constant angular acceleration of 2.0 rad/s2 and is slowing at first.What time elapses before its angular velocity is18 rad/s in the direction opposite to its initial angular velocity?
A wheel initially has an angular velocity of 36 rad/s but after 6.0s its angular velocity is 24 rad/s.If its angular acceleration is constant the value is:
A wheel initially has an angular velocity of -36 rad/s but after 6.0 s its angular velocity is -24 rad/s.If its angular acceleration is constant the value is: