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Bogdan [553]
4 years ago
14

Which best explains why a wood- burning fireplace represents an open system?

Physics
2 answers:
Anna11 [10]4 years ago
6 0

D. Fire requires oxygen

11111nata11111 [884]4 years ago
4 0
D-Because a fire requires oxygen from the atmosphere to burn
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Answer:

F = ⅔ F₀

Explanation:

For this exercise we use Coulomb's law

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let's use the subscript "o" for the initial conditions

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now the charge changes q₁ = q₂ = 2q and the new distance is r = 3 r

       

we substitute

          F = k 4q² / 9 r²

          F = k q² r² 4/9

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