Aplanet has two moons with identical mass. moon 1 is in a circular orbit of radius r. moon 2 is in a circular orbit of radius 2r. the magnitude of the gravitational force exerted by the planet on moon 2 is which of the following compared with the gravitational force exerted by the planet on moon 1?
half as largetwice as largeone-fourth as largefour times as largethe same

You have a pick-up truck that weighed 4,000 pounds when it was new. you are modifying it to increase its ground clearance. when you are finished

How are the crust and the inner core alike? a) they are both solid. b) they both have the same temperature. c) they are both under the same pressure. d) they are both very close to the center of the earth.

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