Engineering, 24.02.2020 20:54 anazia10
A steel ball of 20 mm diameter (k = 60 W/m·ºC, α = 177×10-6 m2/s, rho = 7854 kg/m3) is dropped in a large tank of water. The sphere ball is initially isothermal at 360 K and drops until the center temperature is 320 K, and the temperature of the water is 280 K. The sphere ball may be assumed to quickly reach the terminal velocity of 1.3 m/s in the water. Determine the height of the water tank required to cool the sphere ball to 320 K. Use analytical one-term approximation method for the conduction heat transfer.
Answers: 2
Engineering, 04.07.2019 18:10
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Engineering, 04.07.2019 18:10
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
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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
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A steel ball of 20 mm diameter (k = 60 W/m·ºC, α = 177×10-6 m2/s, rho = 7854 kg/m3) is dropped in a...
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