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A 200 g ceramic cup contains 300 g of water, both at 20 °C. An immersion...

A 200 g ceramic cup contains 300 g of water, both at 20 °C. An immersion heater is used to raise the temperature of both the cup and the water to the boiling point of the water. The specific heat capacity of ceramic is 840 J/(kg °C). (a) What is the final temperature of the cup and the water? (b) How much heat is required for both cup and water to reach this temperature?

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Answer #1

a)

Boiling point of water is 100oC ,Therefore final temperature of the cup and the water

T=100oC

b)

Heat required to raise the temperature of water and cup to boiling point is

Q=mWCW(T-To)+mCCC(T-To)

Q=0.3*4186*(100-20)+0.2*840*(100-20)

Q=113904 J or 113.9 KJ

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