Q203 · Practice questionComplex familiar1 mark
QUESTION 203
A planet sweeps an area of in days in one part of its elliptical orbit. How long does it take to sweep elsewhere in the same orbit?
(A)
days
(B)
days
(C)
days
(D)
days
WORKED SOLUTION
1 markAnswer C
ANSWER
C. days
Worked solution
Kepler's second law gives a constant swept area per unit time. Hence days. The changing orbital speed does not change this area rate.
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 C.
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