Engineering, 03.03.2020 01:19 sydneydavis57
A 1 m thick wall is made of concrete with a thermal conductivity of 1 W/m/K. There are temperature sensors on the wall’s surface and buried within the wall 1 cm from each surface. One set of temperature sensors shows the surface at 30 oC and the subsurface at 32 oC, while the other shows the surface at 40 oC and the subsurface at 35 oC. a. Is the wall heating up or cooling down? b. What’s the rate of change of thermal energy contained per unit area of wall? c. Would your answer change if the wall were 0.5 m thick?
Answers: 2
Engineering, 04.07.2019 18:10
A-mn has a cubic structure with a0 0.8931 nm and a density of 7.47 g/cm3. b-mn has a different cubic structure, with a0 0.6326 nm and a density of 7.26 g/cm3. the atomic weight of manganese is 54.938 g/mol and the atomic radius is 0.112 nm. determine the percent volume change that would occur if a-mn transforms to b-mn.
Answers: 2
Engineering, 04.07.2019 18:10
True or false (explain) (110)[111] is a slip system in bcc metals . the {111} family in fcc contains 8 planes. resolved shear stress (rss) in single crystals is just related to the applied stress. critical resolved shear stress (crss) in single crystal metals is direct proportional to the number of defects in the structure
Answers: 2
Engineering, 04.07.2019 18:10
Awall of 0.5m thickness is to be constructed from a material which has average thermal conductivity of 1.4 w/mk. the wall is to be insulated with a material having an average thermal conductivity of 0.35 w/mk so that heat loss per square meter shall not exceed 1450 w. assume inner wall surface temperature of 1200°c and outer surface temperature of the insulation to be 15°c. calculate the thickness of insulation required.
Answers: 3
Engineering, 04.07.2019 18:20
Aheavily insulated piston-cylinder device contains 0.02 m3 of steam at 300 kpa and 200 °c. 1.2 mpa. d this process. team is now compressed in a reversible manner to a pressure of etermine the entropy change and the work done on the steam during this process
Answers: 1
A 1 m thick wall is made of concrete with a thermal conductivity of 1 W/m/K. There are temperature s...
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