Hauj lwm lawm
Kev tsis






















qhov siab tshaj plaws ntawm cov zis helical iav n hniav {{0}} v ceev / (3.14 × D)=0.80/( 3.14 × 111.4 × 0.001) =2.29r/s , qhov siab tshaj plaws angular tshaj tawm ntawm cov zis helical iav ω hniav =n·2π=2.29 × 2 × 3.14=14.38rad/s.
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