a box of mass m , sliding with an initial speed of v on a rough horizontal surface, runs into a fixed spring of elastic constant k , compressing it a distance x from its relaxed position before momentarily coming to rest.

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