When an old LP turntable was revolving at 331 rpm, it was shut off and uniformly slowed down and stopped in 5.5 seconds. (a) The magnitude of its angular acceleration as it slowed down is 0.63 (b) It turned 1.53 Answer 1: 0.63 Answer 2: 1.53 revolutions while stopping. rad/s2

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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.