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Q. 21

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Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
Found in: Page 544

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Short Answer

30 g of copper pellets are removed from a 300C oven and immediately

dropped into 100 mL of water at 20C in an insulated

cup. What will the new water temperature be?

The water temperature of

See the step by step solution

Step by Step Solution

Step 1:Given information

of copper pellets at and of water at

formula used:

The formula for calculating each element's energy is:

Step 2: Calculation

Solving for :

Now we need to figure out what kind of mass there is. The water is

The following information can be found in a table of specific heat capacity:

The initial temperature in Kelvin:

Substituting values:

The energy that the copper pellets lose is replaced by the energy gained by the water. There is no energy leakage into the environment because it is an isolated system.

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