Assume a disk with 400 cylinders is accessing cylinder 50 now and just accessed and served a request on cylinder 51 before that. further assume that the fifo queue of pending requests is 20, 45, 60, 220, 250, 190. what order will the pending requests be satisfied using the following policies, and how many cylinders will the head need to move to satisfy these requests in each case? a. shortest seek time first (sstf)b. lookc. c-lookd. scane. c-scan

Fluids at rest possess no flow energy. a)- true b)- false

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

The drive force for diffusion is 7 fick's first law can be used to solve the non-steady state diffusion. a)-true b)-false