A uniform circular disc of radius 50cm at rest is free to rotate about an axis which is perpendicular to its plane and passes through its centre. It is subjected to a torque which produces a constant angular

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Correct answer: A. 8.0

At the end of 2sec,w = w _ 0 + w = 0 + 2(2) = 4rad/sec Particle acceleration towards the center is = a _ c = rw^ 2 a _ c = (1)/(2) (4) ^ 2 = 8 m/s ^ 2 Tangential acceleration a _ t = α ⋅ R = 1 m/s ^ 2 a _ net = a _c^ 2 + a _t^ 2 = 8 ^ 2 + 1 ^ 2 = 65 8 (approximately)

A uniform circular disc of radius 50cm at rest is free to rotate...

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