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A sphere of naphthalene having a radius of 2mm is suspended in a large volume of shell air at 318 K and 1 atm. The surface pressure of the naphthalene can be assumed to be at 318 K is 0.555 mm Hg. The D AB of naphthalene in air at 318 K is 6.92 * 10 -6 m 2/sec. Calculate the rate of evaporation of naphthalene from the surface.
a refrigerator uses refrigerant-134a as the working fluid and operates on an ideal vapor-compression cycle between 0.12
a piston-cylinder assembly contains 1kg of water initially occupying a volume of 0.5m3 at 1bar. energy transfer by heat
What is the difference between corrosion and stress corrosion cracking of pipelines? Which of them is more dangerous and why?
would a flagpole made of steel or aluminum freeze ones tongue to it faster? why? thermal conductivity 2. the outer
1 kg of air is allowed to expand reversibly in a cylinder behind a piston in such a way that the temperature remains
a certain kind of brick has a density of 2000kgm3 and a compressive strenght of 40mpa. what is the highest vertical
determine the temperatures of surface 1 through 4 of the furnace cavity of example 13.3 if the entire furnace
a wellinsulated counterflow heat exehanger operates at steady state. in one stream liquid water enters at 10 degree
a light globe dissipates 200w as heat. it is exposed to a light breeze of air at 20c which results in a convective heat
Lawn mower engines normally have finned surfaces directly attached to the engine block, with no radiator, in order to achieve the required cooling. Why might the cooling strategies be different in these two applications?
a cycle using helium in a piston-cylinder device starts at t1 300 k and p1 0.2 mpa. the helium is then compressed
A 0.7-lb block rests on top of a 0.5-lb block supported by but not attached to a spring of constant 9 lb/ft. The upper block is suddenly removed. Determine (a) the Maximum velocity reached by the 0.5-lb block, (b) the maximum height reached by the..
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