If 100 J of heat is added to a system and 40 J of work is done by the system, wh
Practice Questions
Q1
If 100 J of heat is added to a system and 40 J of work is done by the system, what is the change in internal energy?
60 J
40 J
100 J
140 J
Questions & Step-by-Step Solutions
If 100 J of heat is added to a system and 40 J of work is done by the system, what is the change in internal energy?
Step 1: Identify the amount of heat added to the system, which is 100 J. This is represented as Q.
Step 2: Identify the amount of work done by the system, which is 40 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 = 100 J - 40 J.
Step 5: Calculate the result: ΔU = 60 J.
First Law of Thermodynamics – The First Law states that the change in internal energy (ΔU) of a system is equal to the heat added to the system (Q) minus the work done by the system (W).
