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Q4. A gear drive consists of a 28 tooth pinion on the input shaft driving an 84 tooth wheel on the output shaft. The input shaft is 75 mm diameter, runs at a speed of 300 rpm with a maximum shear stress of 13.9 MN/m². The output shaft is 100 mm diameter. The efficiency of the gear drive is 90%.

Calculate EACH of the following:

(a) the speed of the output shaft. (2)

(b) the output power. (8)

(c) the maximum shear stress in the output shaft. (6)