Which of the following is NOT a field force?
A. Magnetism
B. Gravity
C. Friction
D. Electricity

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

Select all the correct answers. which three statements about electromagnetic radiation are true?

Acalorimeter uses the principle that thermal energy flows from hotter material to colder material until both reach the same