# A disc of radius 10 cm is rotating about its axis at an angular speed of 20 rad/s, Find the linear speed of(a) a point on the rim,(b) the middle point of a radius.

Given –

Radius of disc = 10 cm = 0.1 m

(a) Now, the linear velocity of the rim is given by -

(b) To calculate linear velocity at the middle of the radius, divide the above equation by 2 we get-

Linear velocity at the middle of radius –

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