Video: Yuav ua li cas koj pom qhov nruab nrab tshaj tawm ntawm qhov tshaj tawm vs lub sijhawm teeb?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Thaj chaw hauv qab ceev / sij hawm nkhaus yog tag nrho kev hloov chaw. Yog tias koj faib qhov ntawd los ntawm kev hloov hauv sij hawm , koj yuav tau txais nruab nrab ceev . Ceev ceev yog daim ntawv vector ntawm ceev . Yog ceev yog ib txwm tsis-negative, ces nruab nrab ceev thiab nruab nrab ceev yog tib yam.
Yog li ntawd, dab tsi yog tus qauv rau nruab nrab tshaj tawm?
Nruab nrab ceev (v) ntawm ib yam khoom yog sib npaug rau nws qhov kawg ceev (v) plus pib ceev (u), muab faib ua ob. Qhov twg: ¯v = nruab nrab ceev . v = final ceev.
Kuj Paub, qhov nruab nrab acceleration yog dab tsi? Nruab nrab acceleration yog qhov hloov ntawm qhov nrawm muab faib los ntawm lub sijhawm dhau mus. Piv txwv li, yog tias qhov ceev ntawm marble nce ntawm 0 mus rau 60 cm / s hauv 3 vib nas this, nws nruab nrab acceleration yuav yog 20 cm/s/s. Qhov no txhais tau hais tias marble qhov nrawm yuav nce 20 cm / s txhua ob.
Ua raws li qhov kev pom no, dab tsi yog tus qauv ntawm kev txav chaw?
Taw qhia rau lub Kev khiav tawm thiab Acceleration Equation Nws nyeem: Kev khiav tawm sib npaug qhov qub tshaj tawm los ntawm lub sij hawm ntxiv rau ib nrab ntawm qhov acceleration multiplied los ntawm lub square ntawm lub sij hawm. Ntawm no yog ib qho piv txwv teeb meem thiab nws txoj kev daws teeb meem uas qhia txog kev siv qhov sib npaug: Ib qho khoom txav nrog qhov nrawm ntawm 5.0 m / s.
Dab tsi yog qhov sib npaug rau acceleration?
Txhawm rau xam acceleration, siv qhov sib npaug a = Δv / Δt, qhov twg Δv yog qhov hloov pauv hauv ceev , thiab Δt yog ntev npaum li cas nws siv rau qhov kev hloov ntawd tshwm sim. Txhawm rau xam Δv, siv qhov sib npaug Δv = vf - vi, qhov twg vf yog qhov kawg ceev thiab vi yog pib ceev.
Pom zoo:
Yuav ua li cas koj pom qhov nruab nrab tshaj tawm nrog ob lub nrawm?
Cov lej ntawm qhov pib thiab qhov kawg tshaj tawm yog muab faib los ntawm 2 txhawm rau nrhiav qhov nruab nrab. Lub tshuab xam zauv nruab nrab nrawm siv cov qauv qhia qhov nruab nrab tshaj tawm (v) sib npaug ntawm qhov kawg tshaj tawm (v) thiab qhov pib tshaj tawm (u), muab faib los ntawm 2
Yuav ua li cas koj pom lub kaum sab xis nruab nrab muab qhov chaw thiab lub vojvoog ntawm ib lub sector?
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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)
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