[T] A rectangular dam is 40 ft high and 60 ft wide. Assume the weight density of water is
62.5lb(s)/(f)t^(3)
. Compute the total force
F
on the dam when a. the surface of the water is at the top of the dam and [T] Find the work required to pump all the water out of the cylinder in the preceding exercise if the cylinder is only half full.