Video: Qhov nruab nrab ceev thiab tshaj tawm yog dab tsi?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
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.
Pom zoo:
Yuav ua li cas koj pom qhov nruab nrab thiab nruab nrab ntawm daim duab peb sab?
Txhawm rau nrhiav qhov chaw nruab nrab ntawm daim duab peb sab, nws yog qhov yooj yim tshaj plaws los kos tag nrho peb qhov nruab nrab thiab nrhiav lawv qhov kev sib tshuam. Txhawm rau kos qhov nruab nrab ntawm daim duab peb sab, ua ntej nrhiav qhov nruab nrab ntawm ib sab ntawm daim duab peb sab. Kos ib kab ntu uas txuas qhov taw tes no mus rau qhov rov qab vertex
Qhov nruab nrab nruab nrab ntawm lub ntiaj teb yog dab tsi?
Lub teb chaws qhov ntsuas kub yog 2.91 ° C (5.24 ° F) saum toj no 1961-1990 qhov nruab nrab, tawg cov ntaub ntawv yav dhau los tau teev tseg hauv 2013 los ntawm 0.99 ° C (1.78 ° F)
Qhov nruab nrab tshaj tawm thiab nws cov qauv yog dab tsi?
Qhov nruab nrab Velocity Formula (tshem tawm lub sijhawm) Qhov nrawm ntawm ib qho khoom yog tus nqi uas nws txav ntawm ib txoj haujlwm mus rau lwm qhov. Qhov nruab nrab tshaj tawm yog qhov sib txawv ntawm qhov pib thiab xaus txoj haujlwm, muab faib los ntawm qhov sib txawv ntawm lub sijhawm pib thiab xaus
Dab tsi yog qhov txawv ntawm instantaneous thiab nruab nrab ceev dab tsi yog qhov piv txwv loj tshaj ntawm kev ceev ceev?
Qhov nruab nrab ceev yog qhov ceev nruab nrab ntawm lub sijhawm. Instantaneous ceev yuav yog qhov ceev txhua qhov muab tam sim ntawd hauv lub sijhawm ntawd, ntsuas nrog lub ntsuas ntsuas lub sijhawm
Yuav ua li cas koj pom qhov nruab nrab tshaj tawm ntawm qhov tshaj tawm vs lub sijhawm teeb?
Qhov chaw nyob hauv qab qhov nrawm / lub sijhawm nkhaus yog tag nrho cov kev hloov pauv. Yog tias koj faib qhov ntawd los ntawm kev hloov pauv hauv lub sijhawm, koj yuav tau txais qhov nruab nrab tshaj tawm. Velocity yog vector daim ntawv ntawm kev ceev. Yog tias qhov nrawm ib txwm tsis yog qhov tsis zoo, ces qhov nruab nrab tshaj tawm thiab qhov nruab nrab ceev yog tib yam