An 8-cm-diameter potato (p = 1100 kg/m2, C, = 3900 J/kg °C, k = 0.6 %3D W/m °C, and a = 1.4 x 10-7 m/s) that is initially at a uniform temperature of 25°C is baked in an oven at 170°C until a temperature sensor inserted to the center of the potato indicates a reading of 70°C. The potato is then taken out of the oven and wrapped in thick towels so that almost no heat is lost from the baked potato. Assuming the heat transfer coefficient in the oven to be 25 W/m? °C, determine (a) how long the potato is baked in the oven and (b) the final equilibrium temperature of the potato after it is wrapped. Answer: a) 2320 s b) 101°C

An 8-cm-diameter potato (p = 1100 kg/m2, C, = 3900 J/kg °C, k = 0.6 %3D W/m °C, and a = 1.4 x 10-7 m/s) that is initially at a uniform temperature of 25°C is baked in an oven at 170°C until a temperature sensor inserted to the center of the potato indicates a reading of 70°C. The potato is then taken out of the oven and wrapped in thick towels so that almost no heat is lost from the baked potato. Assuming the heat transfer coefficient in the oven to be 25 W/m? °C, determine (a) how long the potato is baked in the oven and (b) the final equilibrium temperature of the potato after it is wrapped. Answer: a) 2320 s b) 101°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

Q14/
An 8-cm-diameter potato (p 1100 kg/m', C, = 3900 J/kg · °C, k = 0.6
%3D
W/m °C, and a = 1.4 x 10-7 m/s) that is initially at a uniform
temperature of 25°C is baked in an oven at 170°C until a temperature sensor
inserted to the center of the potato indicates a reading of 70°C. The potato is
then taken out of the oven and wrapped in thick towels so that almost no
heat is lost from the baked potato. Assuming the heat transfer coefficient in
the oven to be 25 W/m? °C, determine (a) how long the potato is baked in
the oven and (b) the final equilibrium temperature of the potato after it is
wrapped. Answer: a) 2320 s b) 101°C

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