What is the most significand advantage of expendable pattern casting process over conventional sand mold casting? what is the most significant disadvantage?

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.

What precautions should you take to prevent injuries when dealing with heavy loads?

The higher the astm grain size number, the finer the gran is. a)-true b)-false