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15) The Earth's surface gravity famously has a value of about g=9.8 m/s2. Use the Law...

15) The Earth's surface gravity famously has a value of about g=9.8 m/s2. Use the Law of Equilibrium to figure out the gravitational acceleration in low orbit, at an altitude of about 1700 km. The Earth's mass is about 6×1024 kg and its radius is about 6.4×106 meters. Answer:

16) Imagine a planet whose surface gravity is only a seventh. If its radius is 9.14×105 m, what is the planet's mass? Answer:

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15. We use the following formula,

16. let the mass of planet X be m and its radius be r, so we have

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