Consider a hot working operation where there is no work hardening but the flow stress is sensitive to strain rate. Calculate the maximum strain rate that can be used in the deformation if the flow stress cannot exceed 200 MPa. Assume a strain rate sensitivity exponent is 0.1 and the strength constant is 175 MPa. There is no effect of friction with the tooling

For the closed feedwater heater below, feedwater enters state 3 at a pressure of 2000 psia and temperature of 420 °f at a rate of ix10 ibhr. the feedwat extracted steam enters state 1 at a pressure of 1000 psia and enthalpy of 1500 btu/lbm. the extracted er leaves at an enthalpy of 528.7 btu/lbm steam leaves as a saturated liquid. (16) a) determine the mass flow rate of the extraction steam used to heat the feedwater (10) b) determine the terminal temperature difference of the closed feedwater heater