Question: If 1000 J of heat is added to a system and it does 400 J of work, what is the change in internal energy? (2021)
Options:
600 J
400 J
1000 J
1400 J
Correct Answer: 600 J
Solution:
Using the first law of thermodynamics, ΔU = Q - W = 1000 J - 400 J = 600 J.
If 1000 J of heat is added to a system and it does 400 J of work, what is the ch
Practice Questions
Q1
If 1000 J of heat is added to a system and it does 400 J of work, what is the change in internal energy? (2021)
600 J
400 J
1000 J
1400 J
Questions & Step-by-Step Solutions
If 1000 J of heat is added to a system and it does 400 J of work, what is the change in internal energy? (2021)
Step 1: Identify the amount of heat added to the system, which is 1000 J. This is represented as Q.
Step 2: Identify the amount of work done by the system, which is 400 J. This is represented as W.
Step 3: Use the first law of thermodynamics formula, which is ΔU = Q - W.
Step 4: Substitute the values into the formula: ΔU = 1000 J - 400 J.
Step 5: Calculate the result: ΔU = 600 J.
First Law of Thermodynamics – The principle that the change in internal energy of a system is equal to the heat added to the system minus the work done by the system.
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