Refrigerant 134a enters an air conditioner compressor at 4 bar, 20°c, and is compressed at steady state to 12 bar, 80°c. the volumetric flow rate of the refrigerant entering is 4 m3/min. the work input to the compressor is 60 kj per kg of refrigerant flowing. neglecting kinetic and potential energy effects, determine the magnitude of the heat transfer rate from the compressor, in kw.

Avehicle has an oil leak that is causing the entire oil pan to be wet, but inspection reveals no exact source after cleaning off the oil residue. technician a says to install a fluorescent dye in the crankcase and operate the engine, then re-inspect for leaks with a special light (black light). technician b says the oil leak may be coming from a source at the top of the engine, such as a valve cover gasket. who is correct?

Based on the concept of the wave-like nature of light, huygens' theory of light postulates that the more light was "bent" by a substance the slower it would move while traversing across that substance. a) deflection b) interference c) refraction d) resonance

The coefficient of friction is a number that represents the resistance to sliding between two in contact with one another.