Can someone please help me please

An uncharged nonconductive hollow sphere of radius 18.0 cm surrounds a 12.0 µc charge located at the origin of a cartesian coordinate system. a drill with a radius of 1.00 mm is aligned along the z axis, and a hole is drilled in the sphere. calculate the electric flux through the hole.

Where is the potential energy throughout the loading, cocking, and releasing of the trebuchet?

It is really hard for me right know