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Q7. A gearing consists of a 28 tooth pinion on the solid input shaft driving an 84 tooth wheel on the solid output shaft. The 75 mm diameter input shaft rotates at 300 rpm and its shear stress is restricted to 13. 9 MN I m². The output shaft is 100 mm in diameter and the efficiency of the gearing is 90%.

Calculate EACH of the following:

(a) The input power. (8)

(b) The output shear stress. (8)