A turntable is a uniform disc of mass 1.2 kg and radius 1.3 x 10-1 m. The turntable is spinning at a constant rate of?? = 0.5 ??. The motor is turned off and the turntable slows to a stop in 8.0 s with constant angular deceleration. Find the (a) moment of inertia of the turntable; (b) initial rotational kinetic energy; (c) angular deceleration of the turntable while it is slowing down
Angular speed, acceleration and displacement
Angular acceleration is defined as the rate of change in angular velocity with respect to time. It has both magnitude and direction. So, it is a vector quantity.
Angular Position
Before diving into angular position, one should understand the basics of position and its importance along with usage in day-to-day life. When one talks of position, it’s always relative with respect to some other object. For example, position of earth with respect to sun, position of school with respect to house, etc. Angular position is the rotational analogue of linear position.
A turntable is a uniform disc of mass 1.2 kg and radius 1.3 x 10-1 m. The turntable is spinning at a
constant rate of?? = 0.5 ??. The motor is turned off and the turntable slows to a stop in 8.0 s with
constant angular deceleration. Find the (a) moment of inertia of the turntable; (b) initial rotational
kinetic energy; (c) angular deceleration of the turntable while it is slowing down; (d) total angle in
radians that the turntable spins while slowing down; and (e) magnitude of the frictional torque.
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