For some metal alloy it is known that the kinetics of recrystallization obey the avrami equation, and that the value of k in the exponential is 2.70 x 10-6, for time in seconds. if, at some temperature, the rate of recrystallization is 0.0012 s-1, what total time (in s) is required for the recrystallization reaction to go to 90% completion

An air compression refrigeration system is to have an air pressure of 100 psia in the brine tank and an allowable air temperature increase of 60°f for standard vapor compression cycle temperatures of 77 f entering the expansion cylinder and 14 f entering the compression cylinder, calculate the coefficient of performance a. 2.5 b 3.3 c. 4.0 d. 5.0