First Law of Thermodynamics: A fluid in an insulated, flexible bottle is heated by a high resistance wire and expands. If 9.0 kJ of heat is applied to the system and it does 5.0 kJ of work, how much does the internal (thermal) energy of the fluid change?
A. 4.0 kJ
B. 14 kJ
C. -4.0 kJ
D. 45 kJ
Answer: A
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