Question 4 A disc is rotating horizontally about its central axis. The disc has a radius of 2.0 m, a moment of inertia of 1.7 x 102 kg m² about its axis of rotation, and is initially spinning at 6.0 rpm. A 30 kg weight drops onto the disc at its outer rim, and then the mass and the disc rotate together. What is the ratio of the final to the initial angular velocity? O 1.4 0.68 0.75 O 1.0 O 0.59

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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.