Buoyancy: A hot air balloon along with its cargo has a mass of 4.0 × 105 kg, and it holds 7.0 × 105 m3 of hot air. It is floating at a constant height in air with a density of 1.29 kg/m3. What is the density of the hot air in the balloon?
A. 1.4 kg/m3
B. 0.72 kg/m3
C. 0.57 kg/m3
D. 0.86 kg/m3
E. 0.43 kg/m3
Answer: B
Physics & Space Science
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