What do objects in space that are moving at a constant velocity in a straight line do? A require constant energy to keep moving
B keep moving at a constant velocity until some force acts on them
C always move in an orbit
D stop on their own when they run out of energy

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