Tubing in ammonia refrigeration units is made of copper.

During a steady flow process, the change of energy with respect to time is zero. a)- true b)- false

True or false (explain) (110)[111] is a slip system in bcc metals . the {111} family in fcc contains 8 planes. resolved shear stress (rss) in single crystals is just related to the applied stress. critical resolved shear stress (crss) in single crystal metals is direct proportional to the number of defects in the structure

The sum of the normal stresses does not change as the stress state rotates through an angle. a)-trune b)- false