The distance covered by a road roller of radius 2.1m in 10 revolutions is ____
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That depends by what you mean by "being in a place". Atoms must be described quantum mechanically where we talk about probability of being rather than being. An atom may have a probability of Ð… of being in one volume and a probability of Ð… of being in a different volume. In a practical sense, this means if you had a whole bunch of identical such atoms, half the time you observed one of them it would "be" in one place and half the time it would "be" in the other. Once you observe where it "is", it is no longer in two places.
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