Question: 6 . 9 . 1 1 WP The dise shown in Eig. P 6 . 9 . 1 1 has a diameter D of 1

6.9.11 WP The dise shown in Eig. P6.9.11 has a diameter D of 1 m and a rotational speed of 1800 rpm. It is positioned 4 mm from a solid boundary. The gap is filled with 15\deg C SAE 10 oil. Find the torque required to overcome the frictional resistance of the oil on the disc. Assume that the circumferential velocity (Va) is linear across the gap at the each radius r.

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