Q4. A centrifugal shoe clutch is shown in Fig Q2 and has four shoes retained by springs. The shoes first contact the output drum at 480 rev/min, at which point the center of gravity of EACH shoe is at a radius of 125 mm from the shaft axis. The internal radius of the output drum 160 mm. When the drive shaft speed is increased to 840 rev/min, the power transmitted to the output shaft is 26 kW.
Calculate the mass of EACH shoe if the coefficient of friction between the shoes and the output drum is 0.4.
Q4. A container of mass 2 tonnes is being lowered onto the deck of a ship. It is supported by 4 steel wires each of 12 mm diameter. The container is being lowered at a constant speed of 0.2 m/s. When the length of the wires is 30 m the brake is suddenly applied. Calculate EACH of the following:
(a) The static stress in EACH wire when supporting the weight of the container;
(b) The additional stress imposed on the wires due to the sudden stop;
(c) The maximum extension of the wires due to the sudden stop.
Note: Modulus of Elasticity for steel = 200 GN/m2
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