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A disc of radius 10 cm is rotating about its axis at an angular speed of 20 rad/s. Find the linear speed of

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asked Mar 29, 2018 in Physics by anukriti (13,536 points) ● 5 ● 10 ● 41

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.

1 Answer

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answered Mar 29, 2018 by faiz (82,347 points) ● 6 ● 6 ● 12
selected Mar 29, 2018 by anukriti
 
Best answer

A disc of radius = 10 cm = 0.1 m
Angular velocity = 20 rad/s
Linear velocity on the rim = ωr = 20 × 0.1 = 2 m/s
Linear velocity at the middle of radius = ωr/2 = 20 × (0.1)/2 = 1 m/s.

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