# Physics Calculation

The weight of an apple near the surface of the earth is 1N. What is the weight of Earth in the gravitational field of the apple?

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1. They are asking for the force (weight) on the Earth due to the presence of the apple. It is also 1 N, but in the opposite direction (towards the apple).

This follows from Newton's third law of motion, but can also be derived from his law of gravity.

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posted by drwls
2. 1N

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posted by hu

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