(a) Calculate the retarding force due to the viscosity of the air layer between a cart and a level air track given the following information—air temperature is 20o C, the cart is moving at 0.400 m/s, its surface area is 2.50 X 10-2 m2, and the thickness of the air layer is 6.00 X 10-5 m. (b) What is the ratio of this force to the weight of the 0.300-kg cart?

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