A thrust shaft of a ship has six collars of (600 mathrm{~mm}) outer diameter and (300 mathrm{~mm})
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A thrust shaft of a ship has six collars of \(600 \mathrm{~mm}\) outer diameter and \(300 \mathrm{~mm}\) inner diameter. The total thrust from the propeller is \(120 \mathrm{kN}\). If the coefficient of friction is 0.15 and the speed of the engine is \(100 \mathrm{rpm}\), determine the power absorbed in friction when
(a) pressure is uniform, and
(b) wear is uniform.
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