Qhov nruab nrab ceev thiab tshaj tawm yog dab tsi?
Qhov nruab nrab ceev thiab tshaj tawm yog dab tsi?

Video: Qhov nruab nrab ceev thiab tshaj tawm yog dab tsi?

Video: Qhov nruab nrab ceev thiab tshaj tawm yog dab tsi?
Video: Tshuaj theem vim li cas thiaj tau nqi ?/ Siv kho mob dab tsi?/paris polyphylla use for? 2024, Kaum ib hlis
Anonim

Nruab nrab ceev thiab nruab nrab ceev yog ob qhov sib txawv. Hauv cov lus yooj yooj yim, lub nruab nrab ceev yog tus nqi uas ib yam khoom mus thiab yog qhia raws li tag nrho cov nrug muab faib los ntawm tag nrho cov sij hawm. Nruab nrab ceev tuaj yeem txhais tau tias tag nrho cov kev hloov pauv tau muab faib los ntawm tag nrho lub sijhawm.

Tib neeg kuj nug, dab tsi yog lub mis rau nruab nrab ceev thiab tshaj tawm?

ceev

nruab nrab ceev v = Δs Δt
instantaneous ceev v = lim Δt→0 Δs = ds Δt dt
nruab nrab ceev v = Δs Δt
instantaneous ceev v = lim Δt→0 Δs = ds Δt dt

Tsis tas li ntawd, qhov nruab nrab ceev yog txhais li cas? Cov nruab nrab ceev ntawm ib yam khoom yog tag nrho cov kev ncua deb ntawm cov khoom faib los ntawm lub sij hawm elapsed los npog qhov kev ncua deb. Nws yog scalar kom muaj nuj nqis uas txhais tau tias nws tsuas yog txhais los ntawm qhov loj. Ib txoj kev xav txog, nruab nrab ceev , yog vector kom muaj nuj nqis. Ib vector kom muaj nuj nqis yog txhais los ntawm qhov loj thiab kev taw qhia.

Hais txog qhov no, qhov sib txawv ntawm qhov nruab nrab ceev thiab tshaj tawm yog dab tsi?

Nruab nrab ceev yog vector kom muaj nuj nqis, txhais tau tias nws suav nrog qhov loj thiab qhov kev taw qhia ntawm cov khoom. Thaum nruab nrab ceev yog ib qho scalar ntau uas tsuas muaj qhov loj ntawm cov khoom. Ceev hais txog qhov kev ncua deb ntawm ib qho khoom ib chav tsev ntawm lub sijhawm. Nws nruab nrab ceev yog 100 kmph.

Ib qho piv txwv ntawm qhov nruab nrab tshaj tawm yog dab tsi?

Nruab nrab ceev , txawm li cas los xij, suav nrog tag nrho cov kev hloov pauv, tsis yog nyob deb. Nws raug xam los ntawm kev faib tag nrho cov kev hloov pauv los ntawm lub sijhawm luv. Hauv no piv txwv , tus tsav tsheb hloov chaw yog xoom, uas ua rau lub nruab nrab ceev tsis mph.

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