To cool a summer house without using a vapor compression refrigeration cycle, hot air is directed through a pipe and is submerged in the closest lake. The pipe is made of plastic with k = 0.15 W/mK with volumetric flow rate of 0.02 m3/s and inlet air temperature of 32˚C. If the water temperature is kept at 15˚C with a convection coefficient of 1000 W/m2K at the outer surface of the pipe, calculate the length that is needed to provide a discharge temperature of 22˚C (in meters)?

For a process taking place in a closed system containing gas, the volume and pressure relationship is pvi-constant. -1.5 bar, the process starts with initial conditions, pi = =0.03 m3 and ends with final volume, v2-0.05 m3 determine the work done by the gas.

Asimple speed reducer is composed of 2 spur gears. the pinion gear has a pitch diameter of 0.75" and 36 teeth while the driven gear has a pitch diameter of 4.0" and 192 teeth. a)-what is the diametral pitch of each gear? b)-if an electric motor rotating ccw at 3000 rpm is coupled to the pinion, what is the rotational speed of the driven gear? c)-if the torque delivered to the pinion is 1 n-m, what is the torque on the driven gear? d)-what is the power transmitted by the gear train?

Different between right hand turning tool and left hand turning tool ?