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A bar of steel 10 cm x 10 cm x 100 cm has an initial carbon content of 7.6 x 10^-3 gm/cm^3. At t=0, the surface of the bar is exposed to a carburizing gas for which the equilibrium composition is 1.52 x 10^-2 gm/cm^3. Assume the surface composition is the equilibrium value and that the diffusion coefficient is 2.5 x 10^-7 cm^2/sec. Discuss the validity of the use of the "semi-infinite" case for considering the penetration of carbon in this situation. At what point does this simplified treatment break down?
the springs of an automobile trailer are compressed 10.6 cm under its weight. find the critical speed when the trailer
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a rigid container of volume 1 m3 contains 16.13 kg of h2o of an unknown phase. the pressure of the h2o is initially 7
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a in a short section of a channel carrying a steady discharge of 36 m3s the depth is seen to increase from 1.6 m to
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a stream of methanol vapor is used to chill a countercurrently flowing saturated steam in an adiabatic heat exchanger.
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