A specimen of 4340 Steel Tempered at 425C is being tested using a single edge notched tension configuration. The estimated Y parameter for the SENT is 2.5. If the specimen is loaded to 60% of the yield strength, what length of starter crack (inches) will cause the specimen to fail by fracture

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 difference(s) did you notice using a pneumatic circuit over hydraulic circuit.explain why the pneumatic piston stumbles when it hits an obstacle.

Coiled springs ought to be very strong and stiff. si3n4 is a strong, stiff material. would you select this material for a spring? explain.