If a planetary ring had an inner diameter of 100,000 km, an outer diameter of 120,000 km, a thickness of 10 meters, and a density of 100 kg/m3, what would be the total mass of material in this ring?
A) 6 * 1020 kg
B) 5 * 1023 kg
C) 4 *1015 kg
D) 2 *1021 kg
E) 3 * 1018 kg
Correct Answer:
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