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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
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 3 m/s through a 1-m diameter opening. How many minutes will it take to inflate this balloon to a 15-m diameter when the P and T of the air in the balloon remain the same as the air entering the balloon?
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Thermodynamics An Engineering Approach
Authors: Yunus A. Cengel, Michael A. Boles
8th edition
73398179, 978-0073398174
