In a vacuum, which of the following statements about terminal velocity must be true? a. objects have the same terminal velocity that they do when there is air. b. objects do not have a terminal velocity, since there is no air resistance. c. objects have a terminal velocity that is less than they do when there is air. d. objects have a terminal velocity that is greater than they do when there is air.

How many dots must be added to the symbol to properly represent a standard nitrogen ion? a) 1 b) 3 c) 5 d) 8

With the simplified model of the eye, what corrective lens (specified by focal length as measured in air) would be needed to enable a person underwater to focus an infinitely distant object? (be careful-the focal length of a lens underwater is not the same as in air! assume that the corrective lens has a refractive index of 1.62 and that the lens is used in eyeglasses, not goggles, so there is water on both sides of the lens. assume that the eyeglasses are 1.90

You can watch static electricity in action by rubbing an inflated balloon against your hair. your hair will actually stand on its end! it does this because each hair becomes charged, and they all repel one another.