Which physics term describes the rule that planets move in elliptical orbits with the Sun at one focus?

A) Kepler's first law

B) Angular velocity

C) Centripetal force

D) Rotational kinetic energy

Answer: A

Explanation: Kepler's first law refers to the rule that planets move in elliptical orbits with the Sun at one focus. A circle is a special case of an ellipse.

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