Q) An apple has been put into a freezer at (-18°C) to be cooled. Initially,the apple is at a uniform temperature of 17°C. The convection heat transfercoefficient on its surface is 6 W/m2°C. Assuming the apple as a spherehaving a diameter of 10-cm and taking its properties as p = 750 kg/m³, p= 2850 J/kg°c, and k = 0.450 W/m°C, determine; (a) the centertemperature of the apple in 45 minutes, (b) the actual amount of heattransfer from the apple, and (c) the final equilibrium temperature of theapple.Hint: consider the temperature is a function of location and time.

As temperature is a function of time and location, a) By transient condition,…

the apple is at a uniform temperature of 17°C. The convection heat transfer coefficient on its surface is 6 W/m2.°C. Assuming the apple as a sphere having a diameter of 10-cm and taking its properties as p 750 kg/m³, cp = 2850 J/kg°C, and k = 0.450 W/m°C, determine; (a) the center temperature of the apple in 45 minutes, (b) the actual amount of heat transfer from the apple, and (c) the final equilibrium temperature of the apple. Hint: consider the temperature is a function of location and time.

the apple is at a uniform temperature of 17°C. The convection heat transfer coefficient on its surface is 6 W/m2.°C. Assuming the apple as a sphere having a diameter of 10-cm and taking its properties as p 750 kg/m³, cp = 2850 J/kg°C, and k = 0.450 W/m°C, determine; (a) the center temperature of the apple in 45 minutes, (b) the actual amount of heat transfer from the apple, and (c) the final equilibrium temperature of the apple. Hint: consider the temperature is a function of location and time.

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

Q) An apple has been put into a freezer at (-18°C) to be cooled. Initially,
the apple is at a uniform temperature of 17°C. The convection heat transfer
coefficient on its surface is 6 W/m2°C. Assuming the apple as a sphere
having a diameter of 10-cm and taking its properties as p = 750 kg/m³, p
= 2850 J/kg°c, and k = 0.450 W/m°C, determine; (a) the center
temperature of the apple in 45 minutes, (b) the actual amount of heat
transfer from the apple, and (c) the final equilibrium temperature of the
apple.
Hint: consider the temperature is a function of location and time.

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