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Q1. A centrifugal clutch is shown in Fig Q4 and has four shoes retained by springs. The shoes first contact the output drum at 9 rev/s, at which point the centre of gravity of each shoe is at a radius of 120 mm from the shaft axis. The internal radius of the output drum is 150 mm. When the drive shaft speed is then increased to 15 rev/s, the maximum power transmitted to the output shaft is 30 kW.

Calculate the mass of each shoe if the coefficient of friction between the shoes and the drum is 0.5.

Fig