A part made from annealed AISI 1018 steel undergoes a 20 percent cold-work operation. Determine the true strain of the material due to cold-working. Also specify what happens to the material due to cold-working. The yield strength before cold-work operation is 32 32 Correct kpsi. The yield strength after cold-work operation is 61.8 61.8 Correct kpsi. The percentage increase in yield strength is 93 93 Correct percent. The percentage increase in ultimate strength is 25 25 Correct percent. The true strain is 0.25 0.25 Incorrect .

Which of the following controllers anticipates the future from the slope of errors over time? a)-proportional b)-on/off c)-integral d)-derivative.

To save energy, the air supply to a 2000 ft office has been shut off overnight and the room temperature has dropped to 40°f. in the morning, the thermostat is reset to 70°f and warm air at 120 f begins to flov in at 200ft'/min. the air is well mixed within the room, and an equal mass flow of air at room temperature (changing with time) is withdrawn through a return duct. the air pressure is nearly 1 atm everywhere. ignoring heat transfer with the surroundings and kinetic and potential energy effects, estimate how long it takes for the room temperature to reach 70°f. plot the room temperature as a function of time.

Tech a says never use a water hose to clean up dust after a repair. tech b says never use a floor scrubber to clean up dust after repairs. who is correct?