Engineering, 24.10.2019 23:43, Manuel2019
After a 27-hour heat treatment at 1000°c (and subsequent cooling to room temperature), the concentration of a is 3.8 wt% at the 14.4-mm position within metal b. if another heat treatment is conducted on an identical diffusion couple, this time at 880°c for 27 hours, at what position will the composition be 3.8 wt% a? the preexponential and activation energy values for the diffusion of a in b are 3.7 × 10-6 m2/s and 152 kj/mol, respectively. x = enter your answer in accordance to the question statement mm
Answers: 2
Engineering, 03.07.2019 15:10, EmilySerna
Heat is added to a piston-cylinder device filled with 2 kg of air to raise its temperature 400 c from an initial temperature of t1 27 cand pressure of pi 1 mpa. the process is isobaric process. find a)-the final pressure p2 b)-the heat transfer to the air.
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Engineering, 04.07.2019 18:10, leomessifanboy678
The filament of an incandescent lamp has a temperature of 2000k. calculate the fraction of radiation emitted in the visible light band if the filament is approximated as blackbody
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Engineering, 04.07.2019 18:10, mamasbug4285
An air compression refrigeration system is to have an air pressure of 100 psia in the brine tank and an allowable air temperature increase of 60°f for standard vapor compression cycle temperatures of 77 f entering the expansion cylinder and 14 f entering the compression cylinder, calculate the coefficient of performance a. 2.5 b 3.3 c. 4.0 d. 5.0
Answers: 3
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