Car b is initially stationary and is struck by car a moving with initial speed v1 = 20 mi / hr. the cars become entangled and move together with speed v′ after the collision. if the time duration of the collision is 0.1 sec, determine (a) the common fi nal speed v′, (b) the average acceleration of each car during the collision, and (c) the magnitude r of the average force exerted by each car on the other car during the impact. all brakes are released during the collision

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

Which of the following ziegler nichols tuning methods the response of the controller to a step input should exhibit an s-shaped curve? a)-open loop mode b)-closed loop mode c)-both modes (open & closed) d)-none of the modes (open & closed)

How to increase the thermal officiency of an ideal simple rankino cycle? among these methods, which one is the best and why?