Acopper (young's modulus 1.1 x 1011 n/m2) cylinder and a brass (young's modulus 9.0 x 1010 n/m2) cylinder are stacked end to end, as in the drawing. each cylinder has a radius of 0.44 cm. a compressive force of f = 7400 n is applied to the right end of the brass cylinder. find the amount by which the length of the stack decreases.

Arefrigerator uses r-134a as the working fluid and operates on the ideal vapor-compression refrigeration cycle except for the compression process. the refrigerant enters the evaporator at 120 kpa with a quality of 34 percent and leaves the compressor at 70°c. if the compressor consumes 450 w of power, determine (a) the mass flow rate of the refrigerant, (b) the condenser pressure, and (c) the cop of the refrigerator. (0.00644 kg/s, 800 kpa, 2.03)