Q202 · Practice questionComplex unfamiliar1 mark
QUESTION 202
Moon A follows a circular orbit of radius around a planet of mass . Moon B follows a circular orbit of radius around a different planet of mass . What is ?
(A)
(B)
(C)
(D)
WORKED SOLUTION
1 markAnswer B
ANSWER
B.
Worked solution
Use separately for each central mass. Thus , and . The same-planet form of Kepler's law cannot be used without the mass factor.
Equivalent physically justified methods and consistent equivalent units accepted.
Displayed decimals are model answers; accept appropriate significant figures and consistent rounding from stated constants.
Select B.
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