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1. A 180-pound skater pushes on a 90-pound skater with 20 Newtons of force. Thanks to...

1. A 180-pound skater pushes on a 90-pound skater with 20 Newtons of force. Thanks to the Third Law, we know that the 90-pound skater is pushing back on the 180-pound skater with: 2. Suppose the Earth’s gravity pulls on an astronomy textbook with 4 pounds of force at the surface of the Earth. The distance from the surface of the Earth to its center is rE. Imagine a platform that is rE above the surface of the Earth. At this height, the Earth’s gravity pulls on the textbook with:

2. Suppose the Earth’s gravity pulls on an astronomy textbook with 4 pounds of force at the surface of the Earth. The distance from the surface of the Earth to its center is rE. Imagine a platform that is rE above the surface of the Earth. At this height, the Earth’s gravity pulls on the textbook with:

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