How far will the cow travel in 35 seconds?

If anyone who can me with this hw? i would really appreciate it

Panel bc in fig. p2.76 is semi-circular, with the 3 meter radius and horizontal straight edge through point b. compute (a) the hydrostatic force of the water on the panel, (b) its center of pressure, and (c) the moment of this force about point b. assume atmospheric pressure on the dry side of the panel

Abowling ball rolling down the lane toward the pins has gravitational potential energy. a. no b. a lot of c. a little