Final answer:
Rotational deceleration occurs when an object that is rotating slows down and comes to a rest. Factors influencing rotational deceleration include the moment of inertia, rotational friction or drag, and external torques applied to the object. The rate of deceleration, or angular acceleration, can be calculated using the formula: Angular acceleration = (final angular velocity - initial angular velocity) / time taken to decelerate.
Step-by-step explanation:
To explain the process of rotational deceleration, we can look at the example of a turntable initially rotating at 20 rpm coming to a stop. Rotational deceleration occurs when an object that is rotating slows down and comes to a rest. This can happen due to external forces acting on the object. Factors influencing the rotational deceleration include the moment of inertia, the rotational friction or drag, and any external torques applied to the object.
In the case of the turntable, it will experience rotational deceleration due to friction and air resistance. The frictional force between the turntable and its surroundings will exert a torque in the opposite direction of the rotation, causing the turntable to slow down. The air resistance will also contribute to the deceleration by creating a drag force against the motion of the turntable.
The rate of deceleration, or the angular acceleration, can be calculated using the following formula:
Angular acceleration = (final angular velocity - initial angular velocity) / time taken to decelerate
Using this formula, the angular acceleration of the turntable can be determined. The number of revolutions the turntable makes while stopping can be calculated by considering the initial angular velocity, final angular velocity, and time taken to decelerate.
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