What is the amount of matter in a substance?
2 answers:
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To solve the problem, we can use the equivalent of Newton's second law for rotational motions:
where
is the net torque acting on the object
I is the moment of inertia of the body
is the angular acceleration of the object.
Using the data of the problem:
and 
, we find the net torque acting on the object:
where
I is the moment of inertia of the body
Using the data of the problem: