For some metal alloy, a true stress of 415 MPa produces a plastic true strain of 0.475. How much does a specimen of this material elongate when a true stress of 325 MPa is applied if the original length is 300 mm. Assume a value of 0.25 for the strain-hardening exponent n.

Refrigerant-134a flows through a carnot heat pump cycle at 0.5 kg/s. it is known that the maximum absolute temperature in the cycle is 1.1 times the minimum absolute temperature, and the net power input to the cycle is 2.5 kw. if the refrigerant changes from a saturated vapor to a saturated liquid during the heat rejection process, determine the maximum magnitude of the enthalpy of vaporization for this process in kj/kg (with 3 significant figures).