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P. 3927. Two small moons revolve around a planet. The period of one of them is 24 hours and the period of the other is 81 hours. The second moon is 2.5 times further from the surface of the planet than the first one. Find the average density of the planet. (The moons revolve along circular paths.)

(4 points)

Statistics on problem P. 3927.
 172 students sent a solution. 4 points: 119 students. 3 points: 11 students. 2 points: 19 students. 1 point: 5 students. 0 point: 11 students. Unfair, not evaluated: 7 solutions.

• Problems in Physics of KöMaL, November 2006

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