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A differential nitrogen pressure exists across a 3 mm thick steel furnace wall. After some time, steady-state diffusion of the nitrogen is established across the wall. Given that the nitrogen concentration on the high-pressure surface of the wall is 2 kg/m^3 and on the low pressure surface is 0.2 kg/m^3, calculate the flow of the nitrogen through the wall (in kg/m^3) if the diffusion coefficient for nitrogen in steel is 5.0 x 10^-11 m^2/s at the furnace operating temperature. Note: "h" is hour.
water contained in a closed, rigid tank, initially saturated vapor at 200C, is cooled to 100C. determine the initial and final pressure, each in bar. locate the initial and final states on a sketches of the p-v and T-v digrams.
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a steel cable is used to support an elevator cage at the bottom of a 2000 ft deep mineshaft. a uniform normal strain of
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