Question: A spherical hot - air balloon is initially filled with air at 1 2 0 kPa and 2 0 8 C with an initial diameter

A spherical hot-air balloon is initially filled with air at 120 kPa and 208 C with an initial diameter of 5 m . Air enters this balloon at 120 kPa and 208 C with a velocity of \(3\mathrm{~m}/\mathrm{s}\) through a \(1-\mathrm{m}\) diameter opening. How many minutes will it take to inflate this balloon to a \(15-\mathrm{m}\) diameter when the pressure and temperature of the air in the balloon remain the same as the air entering the balloon? Answer: 12.0 min
A spherical hot - air balloon is initially filled

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