The state of stress at a point is given by σxx = 65 MPa, σyy = -49 MPa, σzz = 38 MPa, σxy = 28 MPa, σyz = 0 MPa, and σzx = 0 MPa. Calculate the sum of the three principal stresses. Provide your answer in MPa (you do not need to type the units).

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.

Condition monitoring is a major component of. (clo4) a)- predictive maintenance. b)-preventive maintenance c)-proactive maintenance d)-reactive maintenance.

Prove the equivalence between the two statements of the 2nd law of thermodynamics (i.e., a violation of one statement leads to the violatio the other statement)