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Calculate the viscous force on a ball of radius 1mm moving through a liquid of viscosity 0.2 Nsm-2 at a speed of 0.07 ms-1 |
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Answer» Radius of the ball (a) = 1mm = 1 × 10-3 m Co-effecient of viscosity of liquid (η) = 0.2 Nsm-2 Speed of the ball (v) = 0.07 ms-1 According to Stoke’s law Viscous force F = 6 π η av = 6 × 3.14 × 1 × 10-3 × 0.2 × 0.07 = 0.26376 × 10-3 = 2.64 × 10-4 N |
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