Question: The helium-filled balloon in Fig P7.75 is tethered at 20°C and 1 atm with a string of negligible weight and drag. The diameter is 50

The helium-filled balloon in Fig P7.75 is tethered at 20°C and 1 atm with a string of negligible weight and drag. The diameter is 50 cm, and the balloon material weighs 0.2 N, not including the helium. The helium pressure is 120 kPa. Estimate the tilt angle θ if the air stream velocity U is (a) 5 m/s or (b) 20 m/s.

The helium-filled balloon in Fig P7.75

D 50 cm

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For air at 20C and 1 atm take 12 kgm3 and 18E5 kgm s For helium R 2077 ... View full answer

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