Assume a steel ball has just been manufactured with a diameter of 10 cm and has a temperature of 877°C. The ball is cooling in air with an ambient temperature of 25°C and a convection coefficient of 20 W/m².°C. The thermal conductivity, density, and specific heat of steel are, respectively, 40 W/m.°C, 7800 kg/m³, and 450 J/kg.°c. Find the time it will take for the steel ball to reach a temperature of 35°C in the center? Neglect radiation. 13002 A C.

Assume a steel ball has just been manufactured with a diameter of 10 cm and has a temperature of 877°C. The ball is cooling in air with an ambient temperature of 25°C and a convection coefficient of 20 W/m².°C. The thermal conductivity, density, and specific heat of steel are, respectively, 40 W/m.°C, 7800 kg/m³, and 450 J/kg.°c. Find the time it will take for the steel ball to reach a temperature of 35°C in the center? Neglect radiation. 13002 A C.

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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Question

Assume a steel ball has just been manufactured with a diameter of 10 cm and has a temperature of 877°C.
The ball is cooling in air with an ambient temperature of 25°C and a convection coefficient of 20 W/m².°C.
The thermal conductivity, density, and specific heat of steel are, respectively, 40 W/m.°C, 7800 kg/m³, and
450 J/kg. °C. Find the time it will take for the steel ball to reach a temperature of 35°C in the center? Neglect
radiation. 13002 A

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