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Mercury has a radius of 2440 km. A satellite is in circular orbit around Mercury. It...

Mercury has a radius of 2440 km. A satellite is in circular orbit around Mercury. It travels at a distance of 124 km above the surface and its period of rotation is 1 hour 31.5 minutes.
a) Estimate the Mass of Mercury. State which formula(s) you applied and why.
b) Estimate Mercury's mean density. You can assume a spherical planet.
c) Compare your answer to the mean density of Earth. Why is it larger/smaller?
Science   Advanced-Physics   
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