Ascalar can only be a positive quantity that has a magnitude but no direction ? a)-true b)-false

Amass of 1.5 kg of air at 120 kpa and 24°c is contained in a gas-tight, frictionless piston-cylinder device. the air is now compressed to a final pressure of 720 kpa. during the process, heat is transferred from the air such that the temperature inside the cylinder remains constant. calculate the boundary work input during this process.

Draw the engineering stress-strain curve for (a) bcc; (b) fcc metals and mark important points.

In general, how do thermosetting plastics compare to thermoplastics in mechanical and physical properties?