A Large Spherical Air Balloon Is Filled with Helium

question 45

Multiple Choice

A large spherical air balloon is filled with helium.If the balloon is to lift three people,each approximately 80 kg,plus a basket and balloon outer covering material of mass 50 kg,calculate the minimum radius of the balloon.Assume values of the density of air and helium to be 1.29 kg/m³ and 0.18 kg/m³ respectively.

• A)62 m
• B)8.0 m
• C)4.0 m
• D)20 m
• E)5.0 m

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Definitions:

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