A hot isothermal metal substrate at 300°C is coated with a 5 mm acrylic (density 1990 kg/m^3 , specific heat 1470 J/kg*K, and conductivity 0.21 W/m*K) sheet, initially at 20°C. As the sheet is getting heated by contact with the metal substrate determine how long will it take for the insulated back side of the sheet to reach its softening 90°C.

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

Aseries piping system conveys methyl alcohol. the system consists of 70 m of 1- nominal pipe follow by 50 m of 2-nominal pipe, both schedule 40 commercial steel. the 1-nominal pipe contains 3 90° elbows (regular) anda fully open gate valve, all threaded. the pressure drop through the system is 150 kpa. determine the volume flow rate through the system that is horizontally laid.

What is the direction and how to operate the lathe?