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4. A 50 mm diameter standard solid shaft must be replaced by a specially manufactured hollow shaft of the same material with a diameter

4. A 50 mm diameter standard solid shaft must be replaced by a specially manufactured hollow shaft of the same material with a diameter ratio of 1,5 to 1 Determine diameters for the hollow shaft and the percentage weight saving obtained by the replacement. Also compare the torsional stiffness (T/0) of the two shafts.

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