Alarge (w > > a) plate sample containing an edge (surface) crack with an initial length of 0.010mm is subjected to two sets of uniaxial cyclic (sinusoidal) fatigue loading. the first set of cyclic loading varies between +25 and +125 mpa for 350,000 cycles. the second set of loading varies between +250 and ‐250 mpa. assume the material has a plane strain fracture toughness of 25 mpa m 1/2 and paris law material constants n= 3.1 and c = 1.8x10‐10 for the units given here.

Ahouse has the following electrical appliance usage (1) single 40w lamp used for 4 hours per day (2) single 60w fan used for 12 hours per day (3) single 200w refrigerator that runs 24 hours per day with compressor run 12 hours and off 12 hours find the solar power inverter size in watt with correction factor of 1.25.

Coiled springs ought to be very strong and stiff. si3n4 is a strong, stiff material. would you select this material for a spring? explain.

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