Aswimmer extends his wet arms into the windy air outside at 1 atm, 5°c, 50 percent relative humidity, and 30 km/h. if the average skin temperature is 25°c, determine the rate at which water evaporates from both arms and the corresponding rate of heat transfer via evaporation. the arm can be modeled as a 0.6-m-long and 7.5-cm-diameter cylinder with adiabatic ends.

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

Water at the rate of 1 kg/s is forced through a tube with a 2.5 cm inner diameter. the inlet water temperature is 15°c, and the outlet water temperature is 50°c. the tube wall temperature is 14°c higher than the local water temperature all along the length of the tube. what is the length of the tube?

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