For a spacecraft going from the Earth toward the Sun, at what distance from the Earth will the gravitational forces due to the Sun and the Earth cancel? Earth's mass: Me = 5.98 x 1024 kg. The Sun's mass: Ms = 1.99 x 1030 kg. Earth-Sun distance: r = 1.50 x 1011 m.
A spherically symmetric planet has four times the Earth's mass and twice its radius. If a jar of peanut butter weighs 12 N on the surface of the Earth, how much would it weigh on the surface of this planet?
