Q.512mm diameter Steel balls are annealed byheating to 1150 K and then slowly coolingto 400K in an air environment for which T= 325 K and h=20 W/m K. If the propertiesof the steel are k = 40 W/m K, p= 7800 kg/6.3m°and c = 600 J/kg-K, what will be thetime required for the cooling process?A 17 min19 minC16 minD 15 min

Data given - D = 12 mm Ti = 1150 K T∞ = 325 K h = 20 W/m2 K ρ = 7800 kg/m3 Cp = 600 J/kg K

12mm diameter Steel balls are annealed by heating to 1150 K and then slowly cooling to 400K in an air environment for which T 00 = 325 K and h=20 W/m² K. If the properties of the steel are k = 40 W/m K, p= 7800 kg/ m° and c, = 600 J/kg-K, what will be the d. time required for the cooling process? A 17 min B 19 min C 16 min D 15 min

12mm diameter Steel balls are annealed by heating to 1150 K and then slowly cooling to 400K in an air environment for which T 00 = 325 K and h=20 W/m² K. If the properties of the steel are k = 40 W/m K, p= 7800 kg/ m° and c, = 600 J/kg-K, what will be the d. time required for the cooling process? A 17 min B 19 min C 16 min D 15 min

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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