Exam-style question
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In a thermodynamic process, if 500 J of heat is supplied to a system and 200 J of work is done by the system, what is the change in internal energy?.
- A.300 J
- B.500 J
- C.700 J
- D.200 J
Model answer
What a good answer should say
- 300 J
Explanation
Why this works
According to the first law of thermodynamics, the change in internal energy (ΔU) is given by ΔU = Q - W, where Q is the heat supplied and W is the work done. Here, ΔU = 500 J - 200 J = 300 J.
Thus, the change in internal energy is 300 J.
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