The sled shown in Fig. P1.62 slides along on a thin horizontal
layer of water between the ice and the runners. The horizontal force
that the water puts on the runners is equal to 1.2 lb when the sled’s
speed is 50 ft/s. The total area of both runners in contact with the water
is , and the viscosity of the water is
Determine the thickness of the water layer under the runners. Assume
a linear velocity distribution in the water layer.