In a closed system, if 100 J of heat is added and 40 J of work is done by the sy
Practice Questions
Q1
In a closed system, if 100 J of heat is added and 40 J of work is done by the system, what is the change in internal energy? (2022)
60 J
40 J
100 J
Zero
Questions & Step-by-Step Solutions
In a closed system, if 100 J of heat is added and 40 J of work is done by the system, what is the change in internal energy? (2022)
Step 1: Identify the amount of heat added to the system. In this case, it is 100 J.
Step 2: Identify the amount of work done by the system. Here, it is 40 J.
Step 3: Recall the First Law of Thermodynamics formula: ΔU = Q - W, where ΔU is the change in internal energy, Q is the heat added, and W is the work done by the system.
Step 4: Substitute the values into the formula: ΔU = 100 J - 40 J.
Step 5: Perform the calculation: 100 J - 40 J = 60 J.
Step 6: Conclude that the change in internal energy (ΔU) is 60 J.
