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62. (a) Calculate the retarding force due to the viscosity of the air layer between a...

62. (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 2.50×10−2m22.50×10−2m2, and the thickness of the air layer is 6.00×10−5m6.00×10−5m.

(b) What is the ratio of this force to the weight of the 0.300-kg cart?

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