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

A spherical hot-air balloon is initially filled with air at 120 kPa and 20C with an initial diameter of 5 m . Air enters this balloon at 120 kPa and 20C with a velocity of 3ms through a 1-m diameter opening. How many minutes will it take to inflate this balloon to a 14-m diameter when the pressure and temperature of the air in the balloon remain the same as the air entering the balloon?
Give your answer in minutes.
A spherical hot - air balloon is initially filled

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