From the list below, select four situations in which casting is the preferred fabrication technique.

(1) when mechanical strength is not an important consideration
(2) for economical producing of parts that require very close dimensional tolerances (e. g. bushing and gears)
(3) for large pieces and/or complicated shapes
(4) for alloys having low ductilities
(5) when it is the most economical fabrication technique
(6) for metals having high melting temperatures

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

Consider a large isothermal enclosure that is maintained at a uniform temperature of 2000 k. calculate the emissive power of the radiation that emerges from a small aperture on the enclosure surface. what is the wavelength ? , below which 10% of the emission is concentrated? what is the wavelength ? 2 above which 10% of the emission is concentrated? determine the wavelength at which maximum spectral emissive power occurs. what is the irradiation incident on a small object placed inside the enclosure?

Avolume of 2.65 m3 of air in a rigid, insulated container fitted with a paddle wheel is initially at 264 k, 5.6 bar. the air receives 432 kj by work from the paddle wheel. assuming the ideal gas model with cv = 0.71 kj/kg • k, determine for the air the amount of entropy produced, in kj/k