45. What is the matemathical relationship between potential energy (PE) and kinetic energy (KE)? a. They are directly proportional b. They are inversely proportional c. Their sum is equal to the total internal energy of the system (E) d. Both B and C are correct e. None of the above 46. What is a consequence of the 1 Law of Thermodynamics? a. The energy of a system can never change b. The energy of the surroundings can never change c. The energy of the universe can never change d. None of the above
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