Chapter 10, Problem 36A

Interpretation Introduction

Interpretation:

The difference between quality of energy and quantity of energy must be explained. Whether quality or quantity is decreasing must be explained.

Concept Introduction:

Total energy of the universe is constant. Thus energy can’t be created or destroyed. It can be interconverted to other form of energy.

Answer to Problem 36A

Quantity of the energy is the total amount of energy present in a substance. Quality of energy is the nature of the energy whether it is in concentrated form or it is spread.

Quality of energy is decreasing.

Explanation of Solution

Energy is used to do work. Before the work is done the energy is in concentrated form. This energy is more useful. After the work is done the energy is distributed within different substances involved in the process. Total energy before the work done and after the work done remains the same. It means quantity of energy remains the same however the quality of the energy is decreased. The energy obtained after the work done is less convenient to use for further work. Thus quantity and quality of energy defines the amount and nature of the energy respectively.

Conclusion

Quality of the energy is decreasing gradually. Total energy of the universe is constant.