Question: A circular disc rotates over a large stationary plate with a 2 mm thick fluid film betweenthem, the viscosity of the fluid being 40 cp.

A circular disc rotates over a large stationary plate with a 2 mm thick fluid film betweenthem, the viscosity of the fluid being 40 cp. The torque required to rotate the disc at 200rpm was 0.069 Nm. Determine the diameter of the disc.

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