Solution: A sled slides along 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 .08 ft^2, and the viscosity of the water is 3.5x10^-5 lb s/ft^2. Determine the thickness of the water layer under the runners. Assume a linear velocity distribution in the water layer.

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A sled slides along 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 .08 ft^2, and the viscosity of the water is 3.5x10^-5 lb s/ft^2. Determine the thickness of the water layer under the runners. Assume a linear velocity distribution in the water layer.