When a mass suspended from a spring is in its equilibrium position, the upward force exerted by the spring is equal to the downward force exerted by gravity acting on the mass.
True
False

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