Physics
1st Edition
ISBN: 9780133256925
Table of contents
Textbook solutions
All Solutions
Page 345: Practice Problems
Exercise 1
Solution 1
Solution 2
Step 1
1 of 3
No, the cup of hot coffee is not in thermal equilibrium.
Step 2
2 of 3
Temperature of the coffee and environment determines the equilibrium.
Result
3 of 3
See answers.
Step 1
1 of 2
No, the cup of coffee placed on a table is not in thermal equilibrium because the temperature of the cup of coffee keeps on changing and there is a net transfer of energy between the cup of coffee and the surroundings due to its higher temperature as compared to the surroundings.
Therefore the cup of coffee placed on a table is not in thermal equilibrium.
Result
2 of 2
Therefore the cup of coffee placed on a table is not in thermal equilibrium.
Exercise 2
Step 1
1 of 2
Since heat is defined as the transfer of thermal energy, it isn’t valid to say a certain body possesses heat, hence it is invalid to say that hot object has more heat than the cold object.
As for the second question, a certain object can possess thermal energy, which exists because of chaotic movement of very molecules that make up that body. In this question, where only the temperature of the bodies is taken into account, it is valid to say that the hot object has more thermal energy than the cold object. In reality, the amount of thermal energy a body possesses also depends on the mass and material the body is made out of.
Result
2 of 2
it is invalid to say that hot object has more heat than the cold object.
it is valid to say that the hot object has more thermal energy than the cold object.
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