1. The problem statement, all variables and given/known data A car is moving at 65 mph and hits a puddle of water 1 inch deep. What is the shear stress on the tire from the puddle of water if the radius of the tire is 16 inches. r = 16 inches u = 65 mph y = 1 inch mu = viscosity = 2.344*10^-5 lbf*s/ft^2 2. Relevant equations angular velocity: omega = u/r shear stress from fluid: tau = mu*u/y 3. The attempt at a solution Velocity at the bottom of the tire is equal to the velocity of the car: u = omega * r shear stress on the tire: tau = mu*u/y I'm not sure about the velocity at the bottom of the tire.