Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN: 9780190698614
Author: Sadiku, Matthew N. O.
Publisher: Oxford University Press
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5.6 Steel balls 12 mm in diameter are annealed by heating to
1150 K and then slowly cooling to 400 K in an air envi-
ronment for which T325 K and h = 20 W/m².K.
Assuming the properties of the steel to be k = 40 W/mK,
p= 7800 kg/m³, and c = 600 J/kg K, estimate the time
required for the cooling process.
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Transcribed Image Text:5.6 Steel balls 12 mm in diameter are annealed by heating to 1150 K and then slowly cooling to 400 K in an air envi- ronment for which T325 K and h = 20 W/m².K. Assuming the properties of the steel to be k = 40 W/mK, p= 7800 kg/m³, and c = 600 J/kg K, estimate the time required for the cooling process.
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