problem, needs formular

[Kroberts]

I cannot solve this problem. Need help Please. here is the problem.
'What net Torque is required to give a uniform 2.0-kg solid ball with a radius of 0.20m an angular acceleration of 2.0 rad/Ssquare ?[

[Doc Al]

Hint: Similar to F=ma for translational dynamics, Torque is proportional to angular acceleration in rotational dynamics. Mass is replaced by "moment of inertia", which depends on the shape (and axis of rotation) of the object.

Find the moment of inertia of a solid ball.