What is the temperature inside the freezer?

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The discussion revolves around calculating the temperature inside a freezer based on a physics problem involving a piece of copper and water. A 170g copper piece cools in the freezer and, when placed in 0-degree water, causes 4g of water to freeze. The conservation of energy principle is applied, stating that the energy lost by the copper equals the energy gained by the water. There is confusion regarding the formula used for this calculation, prompting a request for clarification. Understanding the energy transfer between the copper and water is crucial for determining the freezer's temperature.
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Homework Statement


A piece of copper of mass 170g is cooled in a freezer. it's then dropped into water at 0degree,causing 4 g of water to freeze.determine the temperature inside the freezer.


Homework Equations





The Attempt at a Solution

 
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Is all the water frozen?
 
No.Only 4g
 
try conservation of energy principle:
ignoring heat losses to the surroundings, then
energy guven out by copper = energy gained by water
 
Okay.But I don't understand that formula.Can you explain to me?
 

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