Physics, 23.03.2020 18:01 cesarcastellan9
A spherical hot-air balloon is initially filled with air at 120 kPa and 20°C with an initial diameter of 5 m. Air enters this balloon at 120 kPa and 20°C 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 16.9-m diameter when the pressure and temperature of the air in the balloon remain the same as the air entering the balloon? The gas constant of air is R = 0.287 kPa·m3/kg·K.
Answers: 3
Physics, 21.06.2019 17:00
Which statement best describes who the period and frequency of electromagnetic was change between gamma rays and microwaves? a) the period and frequency stay the same. b) the period increases and the frequency decreases. c) the period decreases and the frequency increases. d) the period increases and the frequency increases.
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Physics, 22.06.2019 03:00
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Physics, 22.06.2019 11:30
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Physics, 22.06.2019 13:00
Ways that industry and agriculture use physical properties to separate substances
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A spherical hot-air balloon is initially filled with air at 120 kPa and 20°C with an initial diamete...
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