Video: Qhov kwv yees ceev ntawm lub teeb yog dab tsi?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
299,792 km ib ob
Ib yam li ntawd, koj tuaj yeem nug, qhov ceev ntawm lub teeb 3x10 8 yog dab tsi?
Cov ceev ntawm lub teeb yog ntsuas kom muaj tus nqi tib yam ntawm c = 3 x108 m/s tsis hais leej twg ntsuas nws.
Ib yam li ntawd, dab tsi txwv qhov ceev ntawm lub teeb? Tsis muaj dab tsi tuaj yeem mus nrawm dua 300, 000 mais ib ob (186, 000 mais ib ob). Dab tsi ntxiv, tsuas yog teeb tuaj yeem taug kev ntawm no ceev . Nws yog tsis yooj yim sua kom ceev tej yam khoom siv mus txog rau ceev ntawm lub teeb vim nws yuav siv lub zog tsis kawg los ua li ntawd.
Kuj paub yog, qhov ceev ntawm lub teeb xam tau li cas?
Ib qho kev sim thaum ntxov los ntsuas qhov ceev ntawm lub teeb tau ua los ntawm Ole Rømer, ib tug Danish physicist, nyob rau hauv 1676. Siv lub telescope, Ole tau soj ntsuam cov lus tsa suab ntawm Jupiter thiab ib lub hli, Io. Yog hais tias Ole tau paub lub cheeb ntawm lub ntiaj teb lub orbit, nws yuav muaj xam a ceev 227,000,000 m/s.
Dab tsi yog qhov ceev ntawm qhov tsaus ntuj?
Hauv kev tshawb fawb xyoo 2013, cov kws tshawb fawb tau txiav txim siab qhov ntawd tsaus ntuj teeb meem yuav tsum muaj ib ceev ntawm 54 meters ib ob, los yog 177 ko taw - qeeb piv rau cov ceev ntawm lub teeb [qhov chaw: Armendariz-Picon thiab Neelakanta].
Pom zoo:
Qhov kwv yees pKa ntawm thiol yog dab tsi?
6.4 Kuj nug tias, pKa ntawm thiol yog dab tsi? Thiols yog acidic ntau dua li cawv los ntawm qhov nruab nrab ntawm li 5 pKa units los yog li ntawd ( pKa txog 11 rau lub thiol duab hauv qab no). Nco ntsoov tias pKa yog logarithmic, yog li ntawd txhais tau tias lawv nyob li ntawm 10 5 lub sij hawm ntau acidic.
Dab tsi yog qhov sib txawv ntawm daim ntawv qhia kev kwv yees?
Peb ntawm cov hom phiaj ntawm daim ntawv qhia no yog cylindrical, conic, thiab azimuthal
Dab tsi yog qhov flux los ntawm lub voos xwmfab ntawm sab yog tias tus nqi ntawm Q yog ntawm ib qho ntawm nws lub ces kaum?
Raws li peb paub tias, tag nrho cov flux los ntawm tus nqi q yog q / ε 0 (Gauss txoj cai). Yog hais tias tus nqi yog nyob rau ntawm lub ces kaum ntawm lub voos xwmfab, ib co ntawm cov flux nkag mus rau hauv lub voos xwmfab thiab tawm los ntawm ib co ntawm nws lub ntsej muag. Tab sis qee qhov flux tsis nkag mus rau hauv lub voos xwmfab. Qhov 1/8th no yuav muab faib ua 3 ntu dua
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
Dab tsi yog txhais los ntawm kev kwv yees lub sijhawm?
Hauv kev txheeb cais, kev kwv yees ncua sij hawm yog kev siv cov ntaub ntawv piv txwv los xam ib ntu ntawm qhov ua tau (los yog qhov yuav tshwm sim) qhov tseem ceeb ntawm cov pej xeem tsis paub, piv rau qhov kwv yees kwv yees, uas yog ib tus lej