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In a classical model of the hydrogen atom, the electron moves around the proton in a circular orbit of radius 0.053 nm. what is the electron's orbital frequency? what is the effective current of the electron?
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If you held a stone over the mouth of a well and then let it go , what would happen to the stone? explain your answer.
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lúc 7 giờ một ô tô chuyển động thẳng nhanh dần đều đi qua địa điểm A với vận tốc 18km/h , sau khi đi...
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