Estimate the torque needed to rotate the inner cylinder at 1000 rpm if SAE-30 oil at 40°C fills the gap. Assume a linear velocity distribution in the gap. Neglect end effects.
(A) 16.0 N·m
(B) 16.9 N·m
(C) 18.8 N·m
(D) 20.2 N·m
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