Q.

The mass of moon is about 1.2% of the mass of the earth. Compared to gravitational force the earth exerts on the moon, the gravitational force the moon exerts on the earth 

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a

is smaller

b

varies with its phase

c

is the same

d

is greater

answer is A.

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Detailed Solution

Explanation: According to Newton’s third law of motion, for every action, there is an equal and opposite reaction. This means that the gravitational force the Earth exerts on the Moon is equal in magnitude but opposite in direction to the gravitational force the Moon exerts on the Earth.

The difference in mass does not affect the equality of the forces; it only affects the acceleration experienced by each body (the Moon accelerates more due to its smaller mass).

Final Answer

The correct answer is "is the same".

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The mass of moon is about 1.2% of the mass of the earth. Compared to gravitational force the earth exerts on the moon, the gravitational force the moon exerts on the earth