u=700 м/с v=20 Гц s=2000 м n=?
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n=v*t=v*s/u=20*2000/700≈57 оборотов
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u=700 м/с v=20 Гц s=2000 м n=?
===
n=v*t=v*s/u=20*2000/700≈57 оборотов
================================