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Reptile [31]
2 years ago
11

What current is used to power the United States power grid?

Physics
2 answers:
valkas [14]2 years ago
7 0
The USA uses 110V 60Hz AC current.
alexdok [17]2 years ago
3 0
The answer is Alternating Current
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Answer:

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Using T = 2π√(L/g) where T = period of pendulum = 18.7 s, L = length of pendulum = height of smokestack and g = acceleration due to gravity = 9.8 m/s².

So, making L subject of the formula, we have

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L = (T/2π)²g

L = (18.7 s/2π)²(9.8 m/s²)

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L = 86.796 m

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