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an overhang hollow shaft carries a 9 0 0 mm dismeter pulley , whose centre is 2 5 0 mm from the centre of the

an overhang hollow shaft carries a $900$ mm dismeter pulley $,$ whose centre is $250$ mm from the centre of the nearest bearing $.$ the weight of the puuley is $600$ N and the angle of lap is $180 .$ the pulley is driven by a motor vertically below it $.$ if pemissible tension in the belt is $2650$ N snd if coefficient of friction between the belt and pulley surface is $0.3,$ estimate dismeters of shaft when the internal diameter is $0.6$ of the external

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