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1-22 1.2 kg of liquid water initially at 15°C is to be heated to 95°C in a teapot equipped with a 1200-W electric heating element inside. The teapot is 0.5 kg and has an average specific heat of 0.7 kJ/kg-K. Taking the specific heat of water to be 4.18 kJ/kg-K and disregarding any heat loss from the teapot, determine how long it will take for the water to be heated.

1-22 1.2 kg of liquid water initially at 15°C is to be heated to 95°C in a teapot equipped with a 1200-W electric heating element inside. The teapot is 0.5 kg and has an average specific heat of 0.7 kJ/kg-K. Taking the specific heat of water to be 4.18 kJ/kg-K and disregarding any heat loss from the teapot, determine how long it will take for the water to be heated.

Elements Of Electromagnetics
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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1-22 1.2 kg of liquid water initially at 15°C is to be heated to 95°C in a teapot equipped with a 1200-W electric heating element inside. The teapot is 0.5 kg and has an average specific heat of 0.7 kJ/kg-K. Taking the specific heat of water to be 4.18 kJ/kg-K and disregarding any heat loss from the teapot, determine how long it will take for the water to be heated. Water 15°C Electric heating element 1200 W FIGURE P1-22
Transcribed Image Text:1-22 1.2 kg of liquid water initially at 15°C is to be heated to 95°C in a teapot equipped with a 1200-W electric heating element inside. The teapot is 0.5 kg and has an average specific heat of 0.7 kJ/kg-K. Taking the specific heat of water to be 4.18 kJ/kg-K and disregarding any heat loss from the teapot, determine how long it will take for the water to be heated. Water 15°C Electric heating element 1200 W FIGURE P1-22
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