Density: The mass of Mars, 6.40 × 1023 kg, is about one-tenth that of Earth, and its radius, 3395 km, is about half that of Earth. What is the mean density (mass divided by volume) of Mars in kilograms per cubic meter?
A. 9.76 × 102 kg/m3
B. 1.95 × 103 kg/m3
C. 3.90 × 103 kg/m3
D. 7.81 × 103 kg/m3
Answer: C
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D. 