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During a high Reynolds number experiment, the total drag force acting on a spherical body of diameter D= 27 cm subjected to airflow at 1 atm and 5°C is measured to be 5 N. The pressure drag acting on the body is calculated by integrating the pressure distribution (measured by the use of pressure sensors throughout the surface) to be 1.9 N. Determine the friction drag coefficient of the sphere.
Sagot :
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