The moon moves around the earth in a circular orbit and the earth moves around the sun in elliptical orbit then. a) For the earth - moon system, the gravitational attractions between them are the internal forces b) The sun's attraction on the earth and moon are external forces acting on the centre of mass of the system.

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The moon moves around the earth in a circular orbit and the earth moves around the sun in elliptical orbit then.
a) For the earth - moon system, the gravitational attractions between them are the internal forces
b) The sun's attraction on the earth and moon are external forces acting on the centre of mass of the system.

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a is true b is false

a is false b is true

both a and b are true

both a and b are false

answer is C.

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Detailed Solution

For the earth moon system , their mutual gravitational force of attraction is action - reaction pair. This force is internal force. So (a) is true. Again separation between earth and moon is small compared to their distance (d) from the sun , So $F_{1} = \frac{G M m_{1}}{d^{2}}, F_{2} = \frac{G M m_{2}}{d^{2}}$