Question

a gramophone disk rotating with an angular velocity of 8 radian/second.hence an angular acceleration of 5 radian/sec2.find its angular velocity after 4 second.​

Answer 1

Explanation:

Initial angular velocity ω

0

=3rad/s

It stops after one revolution means ω

t

=0 rad/s and angular displacement θ

t

=2π rad

Let angular retardation be α.

⇒ω

t

2

=ω

0

2

−2αθ

t

⇒0

2

=3

2

−2α×2π

⇒α=0.716 rad/s

2

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