3. Players use spin in ball plays like tennis, golf etc. As the ball moves the spin rate will decrease. If the aerodynamic torque t on the ball in flight depends on the forward speed u, density and...

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Extracted text: 3. Players use spin in ball plays like tennis, golf etc. As the ball moves the spin rate will decrease. If the aerodynamic torque t on the ball in flight depends on the forward speed u, density and viscosity of air, the ball diameter D, angular velocity of spin, o and the roughness height e on the ball surface, determine the dimensionless parameters to correlate situation.