An air conditioner operating at steady state is set maintain an inside temperature of a house at 74°f. if the rate of heat transfer through the walls is 1,420 btu/(hr a°r), b 2.7 (assume constant with changes in outside temperature) and an ideal compressor on the air conditioner operators at 4.2 hp. what is the maximum outside temperature where the house can still maintain its temperature?

In general, how do thermosetting plastics compare to thermoplastics in mechanical and physical properties?

At steady state, air at 200 kpa, 325 k, and mass flow rate of 0.5 kg/s enters an insulated duct having differing inlet and exit cross-sectional areas. the inlet cross-sectional area is 6 cm2. at the duct exit, the pressure of the air is 100 kpa and the velocity is 250 m/s. neglecting potential energy effects and modeling air as an 1.008 kj/kg k, determine ideal gas with constant cp = (a) the velocity of the air at the inlet, in m/s. (b) the temperature of the air at the exit, in k. (c) the exit cross-sectional area, in cm2

Plot schematically the tensile stress versus strain curves for a typical thermoplastic material at a temperature below its glass transition temperature (tg and at a temperature above its tg, respectively. do the same for a typical thermosetting material. list in a table any differences or similarities between the two materials at t> tg and t < tg, respectively, and relate them to the structures of the two types of polymers