Question
(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 $20^\circ\textrm{C}$, the cart is moving at 0.400 m/s, its surface area is $2.50 \times 10^{-2} \textrm{ m}^2$, and the thickness of the air layer is $6.00 \times 10^{-5} \textrm{ m}$. (b) What is the ratio of this force to the weight of the 0.300-kg cart?
1. $3.02 \times 10^{-3} \textrm{ N}$
2. $0.00103$
Solution Video