Video: Qhov piv txwv ceev nruab nrab yog dab tsi?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
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. Rau piv txwv , peb yuav hais tias lub tsheb muaj ib tug nruab nrab ceev ntawm 25 mais toj ib teev. Nws nruab nrab ceev tej zaum yuav yog 25 mais toj ib teev vim sab hnub tuaj.
Dhau li ntawm no, tus qauv rau nruab nrab ceev thiab tshaj tawm yog dab tsi?
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 |
Ib tug kuj yuav nug, dab tsi yog tus qauv rau kev ceev? daws rau ceev los yog siv tus nqi formula rau ceev , s = d/t uas txhais tau tias ceev sib npaug nrug muab faib los ntawm lub sij hawm. Yuav kom daws tau lub sijhawm siv lub qauv rau lub sij hawm, t = d / s uas txhais tau hais tias lub sij hawm sib npaug zos nrug muab faib los ntawm ceev.
Ib yam li ntawd, koj pom qhov nruab nrab ceev hauv physics li cas?
Nruab nrab ceev yog xam los ntawm kev faib nyob deb ntawm lub sij hawm (piv txwv li mais/teev). Ok peb yuav tham txog nruab nrab ceev , instantaneous ceev yog qhov kev ncua deb uas koj tab tom npog ntawm lub sijhawm tshwj xeeb. Yog li 100 km ib teev, nruab nrab ceev yog tag nrho qhov kev ncua deb koj yuav npog dhau ib lub sijhawm.
Qhov ceev yog dab tsi?
Ceev yog qhov kev ncua deb mus rau ib chav tsev ntawm lub sijhawm. Nws yog qhov ceev npaum li cas cov khoom txav mus. Ceev yog qhov scalar ntau uas yog qhov loj ntawm qhov nrawm vector. Nws tsis muaj kev taw qhia. Siab dua ceev txhais tau hais tias ib qho khoom txav nrawm dua.
Pom zoo:
Yuav ua li cas koj pom qhov nruab nrab thiab nruab nrab ntawm daim duab peb sab?
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