An ideal brayton refrigeration cycle has a compressor pressure ratio of 7. at the compressor inlet, the pressure and temperature of the entering air are 22 lbf/in2 and 450ºr, respectively. the temperature at the inlet of the turbine is 680ºr. for a refrigerating capacity of 13.5 tons, determine
(a) the mass flow rate of the refrigerant, in lb/min.
(b) the net power input, in btu/min
(c) the coefficient of performance.

What are the factors that affect the resistance of a wire?

Total solidification times of three casting geometries are to be compared: a sphere, a cylinder, in which the length-to-diameter ration - 1.0, and a cube. volume = 1000 cm^3 for all three shhapes, and the same casting alloy is used. a) determine the solidification times of each geometry b) based on the results of part (a), which geometric element would make the best riser? c) if the mold constant = 3.5 min/cm^2 in chvorinov's rule, compute the total solidification time for each casting.

In science and physics what is the standard unit of measure for speed?