Apply the concepts of thermal expansion/contraction of metal and explain of a schematic diagram in a fusion welding process. with the aid of a diagram thermally induced stresses due to welding.

Tech a says never use a water hose to clean up dust after a repair. tech b says never use a floor scrubber to clean up dust after repairs. who is correct?

When x = 10 ft, the crate has a speed of 20 ft/s which is increasing at 6 ft/s^2. determine the direction of the crate's velocity and the magnitude of the crate's acceleration at this instant.

Two kg of refrigerant 134a contained in a piston-cylinder assembly is initially at 4 bar and 70°c. the refrigerant undergoes a constant pressure process to a final state of a saturated vapor. kinetic and potential energy effects can be neglected. a) show the process on a pv diagram b) determine the work for the process, in kj c) determine the heat transfer during the process, in kj