What is the best estimate of the area of the figure at right?

question 13 options:

28 square units

41 square units

54 square units

47 square units

What is the force that opposes motion and works against the downward pull? a) friction b) gravity c) weight d) acceleration

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

What practical value did astronomy offer to ancient civilizations?