In some countries liquid nitrogen is used on dairy trucks instead of mechanical refrigerators. a 3 hour delivery trip requires .200 m^3 of liquid nitrogen which has a density of 808 kg/m^3, assuming it is already at its boiling temperature of -195.8c, calculate the heat transfer necessary to evaporate this amount of liquid nitrogen and raise its temperature to 4.0c (nitrogen: lv=201 kj/ kg, cgas = 1040 j/kgc

One form of energy can be another type of energy. a. created to form b. transformed into c. destroyed and then created to form

In this thread, i would like you to comment on the nature of light and how operation of telescopes. light has a duality of a particle and a wave; which one affects your life? also how does light interact with optics inside telescopic systems? answer these questions in two paragraphs. then respond the another students response.

Ahair dryer is basically a duct in which a few layers of electric resistors are placed. a small fan pulls the air in and forces it through the resistors where it is heated. air enters a 1200 w hair dryer at 100 kpa and 22°c and leaves at 47°c. the cross-sectional area of the hair dryer at the exit is 60 cm2. neglecting the power consumed by the fan and the heat losses through the walls of the hair dryer, determine (a) the volume flow rate of air at the inlet and (b) the velocity of the air at the exit.