In an arc welding operation, a groove weld has a cross sectional area = 0.045 in^2 and is 10 in long. (a) what quantity of heat (in btu) is required to accomplish the weld, if the metal to be welded is medium carbon steel? (b) how much heat must be generated at the welding source, if the heat transfer factor = 0.9 and the melting factor = 0.7? [tm for medium carbon steel = 3060 r]

Two flowing streams of argon gas are adiabatically mixed to form a single flow/stream. one stream is 1.5 kg/s at 400 kpa and 200 c while the second stream is 2kg/s at 500 kpa and 100 ? . it is stated that the exit state of the mixed single flow of argon gas is 150 c and 300 kpa. assuming there is no work output or input during the mixing process, does this process violate either the first or the second law or both? explain and state all your assumptions.

The force on a cutting tool are 2600n vertically downward and 2100 horizontal. determine the resultant force acting on the tool and the angle at which it acts.

Burgers vector is generally parallel to the dislocation line. a)-true b)-false