How is energy involved in chemical and physical changes?

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects

Which lists the pairs of plates in order from least to greatest in terms of the work done to move the electron?

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