A hot air balloon plus its cargo has a mass of 400 kg, and it holds 700 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) 1.39 kg/m3
B) 0.72 kg/m3
C) 0.57 kg/m3
D) 0.86 kg/m3
E) 0.43 kg/m3
B
Physics & Space Science
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