Aprecipitation-hardened aluminum alloy is found to corrode preferentially along the grain boundaries. offer an explanation for this observation.

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)

What is creep? what is stress relaxation?

What are the major differences between injection molding and extrusion?