d=4 t=2*60=120 c n=30 v=?
T=t/n v=π*d/T=π*d*n/t=3.14*4*30/120=3.14 м/с
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d=4 t=2*60=120 c n=30 v=?
T=t/n v=π*d/T=π*d*n/t=3.14*4*30/120=3.14 м/с
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