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5/31 MCQs for:
Gravitational fields
The speed of Halley's Comet, while traveling in its elliptical orbit around the sun:
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.

Who was the first person to realize that the planets move in elliptical paths around the Sun?

List the four fundamental forces in nature.
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?