Q66 · Practice questionComplex unfamiliar5 marks
QUESTION 66 (5 marks)
A moon completes a circular orbit of radius around an unknown planet in . Determine the mass of the planet.
WORKED SOLUTION
5 marksPractice marking scheme
ANSWER
.
Worked solution
Convert the period: . From Kepler’s third law,
Therefore
Converts period to seconds.
Rearranges Kepler relationship for mass.
Substitutes correctly.
Obtains correct mass with units.
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