Engineering, 13.12.2019 06:31 sherlock19
12–75 the emissivity of a tungsten filament can be approximated to be 0.5 for radiation at wavelengths less than 1 mm and 0.15 for radiation at greater than 1 mm. determine the average emissivity of the filament at (a) 2000 k and (b) 3000 k. also, determine the absorptivity and reflectivity of the filament at both temperatures.
Answers: 1
Engineering, 03.07.2019 14:10
When at a point two solid phase changes to one solid phase on cooling then it is known as a) eutectoid point b) eutectic point c) peritectic point d) peritectoid point
Answers: 3
Engineering, 03.07.2019 15:10
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.
Answers: 1
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 18:20
Find the kinematic pressure of 160kpa. for air, r-287 j/ kg k. and hair al viscosity of air at a temperature of 50°c and an absolute (10 points) (b) find the dynamic viscosity of air at 110 °c. sutherland constant for air is 111k
Answers: 3
12–75 the emissivity of a tungsten filament can be approximated to be 0.5 for radiation at wavelengt...
History, 24.09.2019 00:00
Computers and Technology, 24.09.2019 00:00
Social Studies, 24.09.2019 00:00
Computers and Technology, 24.09.2019 00:00
Mathematics, 24.09.2019 00:00
Biology, 24.09.2019 00:00
Mathematics, 24.09.2019 00:00
Mathematics, 24.09.2019 00:00
Health, 24.09.2019 00:00
History, 24.09.2019 00:00
Business, 24.09.2019 00:00
English, 24.09.2019 00:00
Mathematics, 24.09.2019 00:00