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Q9. A 280 mm diameter solid propeller shaft is to be replaced with a hollow shaft that has an external diameter of 350 mm. The replacement shaft is manufactured from the same material so that the maximum shear stress and the angular twist per unit length of the original shaft remain same.  Calculate EACH of the following:

(a) The maximum internal diameter of the hollow shaft. (12)

(b) The percentage reduction in weight. (4)