Posted by **andy** on Wednesday, July 24, 2013 at 9:27am.

What is the wind speed in m/s required to keep a great white shark suspended in midair during a summer day on the California beach?

Details and assumptions

Model the shark as a horizontal cylinder 6 m long and 1 m in diameter.

The air is at a pressure of 1 atm and a temperature of 30∘C.

The density of the shark is that of water, 1000 kg/m^3.

Assume that the wind gust that keeps the shark suspended is blowing straight upwards, and that the air molecules bounce off the shark elastically.

The acceleration of gravity is −9.8 m/s

^2.

ma, the molar mass of air, is 29 g/mol.

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