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Under the second of Kepler's laws, the line from the Sun to a planet sweeps out:
AEqual angles in equal weeks
BEqual arcs in equal months
CEqual edges in equal years
DEqual areas in equal times
Answer & Solution
Correct answer: D. Equal areas in equal times
1. A planet moves faster when it is nearer the Sun.
2. The second law states what stays constant while the speed varies.
3. An imaginary line from the Sun to the planet sweeps out equal areas in equal times.
4. So area, not angle or arc, is the constant quantity.
_Source: OpenStax College Physics for AP Courses 2e (CC BY 4.0), Ch 6 'Uniform Circular Motion and Gravitation', sections 6.1-6.6_
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