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Homework exercises on Thermodynamics for a Physical Science course. Also refer to heat, temperature, thermometer, entropy, conversion, energy, WBT, distance learning, Ron Kurtus, School for Champions Kurtus Technologies, Copyright © Restrictions
Thermodynamics - Homework Answers
After you have completed the Thermodynamics Homework, you can refer to these answers. Although it is better to have known the answer from your reading, the process of writing the correct answer on your homework sheet will help you remember the concepts.
1. What is the study of thermodynamics?
Thermodynamics is the study of the connection between heat and work and the conversion of one into the other.
2. How do you compare heat with the ability to do work?
Heat is proportional to the work done.
3. If you double the weight of a moving vehicle how much more heat is created in stopping it as compared to before? What if you double its velocity? Why?
Doubled weight would result in twice the heat. Doubled velocity would result in 4 times the heat, because heat created is proportional to the square of the velocity..
4. What is the First Law of Thermodynamics?
The First Law of Thermodynamics is the law of conservation of energy. It states that energy cannot be created or destroyed. Instead it is converted from one form to another, such as from work to heat, from heat to light, from chemical to heat, or such.
5. What happens to electrical energy when it goes through a light bulb?
It is changed to heat and light energy.
6. If an engine is 75% efficient in converting heat energy to mechanical energy, what happens to the other 25% of heat?
It is wasted and it radiated from the engine.
7. If you put ice on one end of a metal rod, why does the other end get cold too?
Heat (or absence of heat) travels through a conducting material. In reality, the temperature of the rod reaches an average temperature..
8. Give an example of a heat sink.
A waterbed..
9. If you mix two colors of paint together, why can't you unmix them?
The Law of Entropy. Since the molecules are in constant motion, the paint seeks an average mixture.
10. When you allow a gas to expand, what happens to its temperature? Why?
The Law of Charles states that the volume of a gas varies directly with its absolute temperature, if pressure is held constant: V is proportional to T..
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