A wheel is rotating at 900 rpm about its axis.When the power is cut-off it

A Wheel Is Rotating At 900 Rpm About Its Axiswhen Physics QuestionA Wheel Is Rotating At 900 Rpm About Its Axiswhen Physics Question

A wheel is rotating at 900 rpm about its axis.When the power is cut-off it comes to rest in 1 min.The angular retardation in rad sโปยฒ is

Options

(a) ๐œ‹ / 2
(b) ๐œ‹ / 4
(c) ๐œ‹ / 6
(d) ๐œ‹ / 8

Correct Answer:

๐œ‹ / 2

Explanation:

w = 900 x 2ฯ€/60 = 30ฯ€
Angular Retardation = [final velocity โ€“ initial velocity] / time
= (30ฯ€ โ€“ 0)/60 = ฯ€/2
Therefore, the angular retardation is ฯ€/2.

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