Question

Both the earth and the moon are subject to the gravitational force of the sun. As observed from the sun, the orbit of the moon [NCERT Exemplar]

Easy

A

will be elliptical
B

will not be strictly elliptical because the total gravitational force on it is not central
C

is not elliptical but will necessarily be a closed curve
D

deviates considerably from being elliptical due to influence of planets other than the earth

Solution

As observed from the sun, two types of forces are acting on the moon: one is due to gravitational attraction between the sun and the moon and the other is due to gravitational attraction between the earth and the moon. Hence, total force on the moon is not central.

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