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Which best explains why a wood-burning fireplace represents an open system?
a. because they are not all made of brick
b. because a fire requires oxygen from the atmosphere to burn
c. because they can be used for cooking
d. because the ashes have to be swept away
Answers: 3
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Aplane flying horizontally at an altitude of 1 mile and a speed of of 500mih passes directly over a radar station. find the rate at which the distance from the plane to the station is increasing when it is 2mi away from the station.
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Which best explains why a wood-burning fireplace represents an open system?
a. because...
a. because...
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