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Fluid Mechanics: Calculate the required diameter of a parachute with jumper and gear weigning 250 lb.

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16. A parachute jumper with associated gear weighs 250 lb. The vertical component of the landing speed should not be more that 20 ft/s. By assuming the parachute to be open hemisphere, determine the required diameter of the parachute to be used at standard pressure and 80°F.
Please see attached.

FLUID MECHANICS 9TH EDITION. By Streeter, Wylie & Bedford. ISBN: 0-07-062537-9.

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The drag force is given by:

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The solution clearly explains and shows all calculations to arrive at the answer. The required diameter of a parachute with jumper is calculated.