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62. (a) Calculate the retarding force due to the viscosity of the air layer between a cart and a level air track given the fo
63. What force is needed to pull one microscope slide over another at a speed of 1.00 cm/s, if there is a 0.500-mm-thick laye
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62) liven, Temperative, T=20°C The speed of a cart, v= 0.4m/s. Surface area, A = 2.5 * 10² m² Thickness, L= 6*109 m for (a) T

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