Air flows through a wet pipe at 298 K and 1 atm, and the diffusion coefficient of water vapor in air is 2.5x10-5 m2/s. If the heat transfer coefficient is determined to be 80 W/m2?ºC, the mass transfer coefficient is
(a) 0.0022 m/s (b) 0.036 m/s (c) 0.074 m/s (d) 0.092 m/s (e) 0.13 m/s
(c) 0.074 m/s
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In an industrial environment where intense magnetic fields and large voltage spikes abound, it is easy to lose the ____________________ in the electrical noise.
Fill in the blank(s) with the appropriate word(s).
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Studies have found that humans now spend more than ____ percent of their time indoors.
A. 50 B. 60 C. 70 D. 80
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To calculate concrete volume, structures can usually be divided into two or more _____.
a. volume units b. physical levels c. forming types d. geometric shapes
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Vortex fluid flow provides for which of the following scenarios?
A. Torque multiplication B. Stall speed C. High turbine speed D. High impeller speed
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