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Q. 69

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Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
Found in: Page 598

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Short Answer

.....

kJ

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Step by Step Solution

Step 1. Given Information

mL of water will have a mass of kg, since the density of water is kg/L.

Step 2. Find the energies

The heat that the refrigerator will take will be to cool the water to degree celsius, then to freeze it

The total heat needed is therefore

From the definition of the coefficient of performance we can find

Substitution this to the first law for refrigerators, we get

now,

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