Is gasoline for you car a clean source of energy?

Arock collection comes from which part of earth?

If steel is more dense that lake water, why can a boat float

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