Question: The angular displacement of a rotating disc is given by: =6*sin(t/4) where t is the time in seconds. Determine (a) the angular velocity of

The angular displacement θ of a rotating disc is given by: θ=6*sin(t/4) where t is the time in seconds. Determine
(a) the angular velocity of the disc when t is 1.5s,
(b) the angular acceleration when t is 5.5s and (c) the first time when the angular velocity is zero.

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