Answer:
c. dioptre that's the answer.
Answer:
The aeroplane flew 4200 miles for 7 hours.
600 times 7 is 4200.
The first law of thermodynamics states the conservation of energy and heat where the total energy in an isolated system may be transformed into another, but never created or destroyed. If 286 J of energy was released to the room, then also 286 J of energy was also removed from food in that refrigerator assuming it is an isolated system. :)
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It stays constant, because it's using that energy to change state
