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jeffreylb94: 1 year ago via iPhone

How do you solve this physics problem?

calculate the force of Earth's gravity on a spacecraft 12,800 km (2 Earth radii) above the Earth's surface if it's mass is 1350 kg.

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Answer 1

rghurst: 1 year ago via iPhone | Last edited at 4:51PM on 2/9/2012

Gravity is inversely proportional to the square of the distance. The craft is at weight "W" at one radius from center (on the earths surface). Then it will be 1/4 the weight at 2 radii and 1/9 the weight at 3 radii (2 radii from the surface) which is 150 kg.

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