Concepts Of Physics MCQ Edition [Volume 1]PhysicsRotational Mechanics

A disc of radius 10 cm rotates about its axis with an angular speed of 20 rad/s . Determine the linear speed of the middle point of a radius.

Options

A100 m/s
B0.5 m/s
C2 m/s
D1 m/s

Correct answer

D. 1 m/s

Step-by-step solution

Given radius of the disc, R = 10 cm = 0.1 m Angular speed, = 20 rad/s Distance of the middle point of the radius from the axis of rotation, r = R 2 = 0.1 2 = 0.05 m Linear speed is given by v = r v = 0.05 20 = 1 m/s

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