Suppose that a wing component on an aircraft is fabricated from an aluminum alloy that has a plane strain fracture toughness of 27 MPa (24.57 ksi). It has been determined that fracture results at a stress of 108 MPa (15660 psi) when the maximum internal crack length is 9.4 mm (0.3701 in.). For this same component and alloy, compute the stress level at which fracture will occur for a critical internal crack length of 5.8 mm (0.2283 in.).

An open feedwater heater operates at steady state with liquid entering at inlet 1 with t? = 40°c and pl = 1 .2 mpa. water vapor att2-200°c and p2 = 1.2 mpa enters at inlet 2. saturated liquid water exits with a pressure of pa 1.2 mpa. neglect heat transfer with the surroundings and all kinetic and potential energy effects, determine the mass flow rate of steam at inlet 2 if the mass flow rate of liquid water at inlet 1 is given as 2 kg/s.