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1. 3000J of heat is added to a system and 2500J of work is done by the system. What is the change in internal energy

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1. 3000J of heat is added to a system and 2500J of work is done by the system. What is the change in internal energy of the system? 2. 2000J of heat is added to a system and 2500J of work is done on the system. What is the change in internal energy of the system? 3. 2000J of heat leaves the system and 2500J of work is done on the system. What is the change in internal energy of the system

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