Two point masses m are held in place a distance d apart. Another point mass M is midway between them. M is then displaced a small distance x perpendicular to the line connecting the two fixed masses and released. (a) Find the net gravitational force on M due to the fixed mases. Approximate for x << d. (b) Find the period of oscillation.

Which quantities are scalars? choose all that apply a. distance b. speed c. acceleration d. velocity

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

The energy released by a nuclear fusion reaction is produced when