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HW8: Thermodynamics

Due 11/23/2021

1) Describe what happens to the air molecules in a room when the temperature of a room

increases.

2) Use your knowledge of heat transfer to answer each of the following. For each of the problems

consider that the heat lost by one system will be the heat gained by the other system by

conservation of energy. You are asked to solve for a new final temperature, which will be the

equilibrium temperature. Look up the specific heat capacity of each quantity in question online,,

which you will use to relate the heat gained/lost by a system to the temperature change.

a) 20 g of water is heated to 76 ˚C. This water is poured into a beaker that has 20 g of water at

a temperature of 23 ˚C. Find the final temperature.

b) 75 g of water is heated to 76 ˚C. This water is poured into a beaker that has 120 g of water

at a temperature of 23 ˚C. Find the final temperature.

c) A 45 g block of copper at 25 ˚C is placed in an insulated cup of with 115 g of water at 97

˚C. Find the final temperature.

d) A 32 g block of iron ( initially has a temperature of 42 ˚C. After being put in contact with a

44 g block of copper, it is cooled to 35 ˚C. Find the initial temperature of the copper block.

3) Describe three different ways heat is transferred (Look this up online—I suggest going to

physics classroom, as they have clear and thorough explanations).

4) Read the following article:

a) Provide a brief summary of the article, describing the experiment.

b) What does this experiment show about heat?

c) How did the author minimize error when conducting the experiment?

d) Think of a question you still have after reading the article. Describe an experiment you can

conduct to answer this question.

5) Consider an ideal gas at a temperature T and a pressure P. The gas undergoes process where the

pressure is doubled and the temperature cut into a quarter. What is the volume change of the

gas after the process?

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