Suppose that an electronic device needs two batteries in series to function normally. let the life times of these two batteries have moment generating functions g1(t) =e^10t−110t and g2(t) =e^10t−110t. a. what are the distributions of the lifetimes of these two batteries? b. what is the distribution of the lifetime of the electronic device? c. what is the hazard rate at each timetof the electronic device? is it ifr, cfr or dfr? d. what is the expected lifetime of the electronic device?

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