Kepler's Third Law Relates the Period P and the Semimajor $\pi$

question 173

Multiple Choice

Kepler's third law relates the period P and the semimajor axis a of an orbit. For a circular orbit, P = 2 $\pi$ a/v, so it is possible also to relate the speed at which the particle orbits, v, to a. The result is

• A) as a increases, both P and v increase.
• B) as a increases, P increases but v decreases.
• C) as a increases, P decreases but v increases.
• D) as a increases, both P and v decrease.

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