Question: A cylindrical machine part moves within a surrounding cylinder. The centrelines of the part and the surrounding cylinder are coincident. The cylinder is full

A cylindrical machine part moves within a surrounding cylinder. The centrelines of

A cylindrical machine part moves within a surrounding cylinder. The centrelines of the part and the surrounding cylinder are coincident. The cylinder is full of an oil (viscosity 0.25kg/ms) that is not flowing i.e. no pressure gradient is applied. What is the value of the viscous force exerted on the machine part as it moves along the cylinder at a speed of 11m/s? The machine part is 0.10m long and has a radius of 0.045m. The ratio of the machine part radius to the cylinder radius is 0.98. . Assume that the flow is dominated by viscous forces. Give your answer as an absolute value i.e. no negative sign, in Newtons to one decimal place.

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