Estimate the average density of Triton, a satellite of Neptune, if its mass is 2.1 x 10 ^ 20 kg and its radius is 1353 km.

decision
p = 3m / 4nR ^ 3; p = 3 * 2.1 * 10 ^ 22/4 * 3.14 * (1.353 * 10 ^ 6) ^ 3; p = 2 * 10 ^ 3 (kg / m3)

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