📅 NSB 2015🎓 HS🔄 Round 11#️⃣ Q19❓ TOSS-UP✍️ Short Answer
What is the change in internal energy, delta U, in joules, of a system that absorbs 4000 joules of heat and that does 2000 joules of work on the surroundings?
✔️Answer:2000
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