Science

In math, "pi" is equal to?

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What tool uses a magnetic needle that points north?
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Which of these was one of the original universal elements?
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What are the male reproductive parts of a flower?
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Which kind of tree is most often struck by lightning?
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What is the scientific word for push or pull?
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If you're talking about electricity, what does "DC" stand for?
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What scientist first showed that a changing electric field produces a magnetic field?
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What force slows down a rolling ball?
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