Chapter 24 of 2363 min read
Kepler's laws, satellites, escape velocity
Why this is asked: Escape velocity depends only on the planet's mass and radius, never on the projection angle or the escaping body's own mass. Kepler's third law, T² ∝ r³, likewise links period to orbital radius alone, independent of the orbiting body's mass.
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- •The radius of the Martian orbit around the Sun is about 4 times the radius of the orbit of Mercury. The Martian year is 687 Earth days. Then which of the following is the length of 1 year on Mercury?
- •The minimum energy required to launch a satellite of mass from the surface of the earth (mass , radius ) into a circular orbit at an altitude of from the surface of the earth is:
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