A disk has a rotational inertia of 8.9 kg %u02D1 m 2 and a constant angular acce

Question

A disk has a rotational inertia of 8.9 kg%u02D1m2 and a constant angular acceleration of 3.6 rad/s2. If it starts from rest the work (in J) done during the first 5.1 s by the net torque acting on it is: A disk has a rotational inertia of 8.9 kg%u02D1m2 and a constant angular acceleration of 3.6 rad/s2. If it starts from rest the work (in J) done during the first 5.1 s by the net torque acting on it is: A disk has a rotational inertia of 8.9 kg%u02D1m2 and a constant angular acceleration of 3.6 rad/s2. If it starts from rest the work (in J) done during the first 5.1 s by the net torque acting on it is:

Explanation / Answer

w = alpha*time

= 3.6*5.1

=18.36 rad/sec

Work done = (I*w^2)/2

= (8.9*18.36*18.36)/2

= 1500 joules

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