Video: Thaum lub dot khoom ntawm ob vectors tsis zoo ces kaum ntawm lawv yog?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Yog tias dot khoom yog tsis zoo , ces tus ob vectors taw tes rau cov lus qhia rov qab, orabove 90 thiab tsawg dua lossis sib npaug li 180 degrees.
Hauv qhov no, dot khoom ntawm ob vectors txhais li cas?
Hauv lej, the dot khoom los yog scalar khoom yog ib qho kev ua algebraic uas siv ob sib npaug-ntev sib npaug ntawm cov lej (feem ntau ua haujlwm cov duab ) thiab rov qab ib tus lej. Geometrically, nws yog khoom ntawm lub Euclidean magnitude ntawm lub ob vectors thiab lub cosine ntawm lub kaum sab xis ntawm lawv.
Ib sab saum toj no, cov khoom lag luam ntawm ob lub vectors puas tuaj yeem tsis zoo? Yog lub kaum sab xis ntawm ob vectors yog mob, ces lawv khoom scalar (tseem hu ua dot khoom thiab sab hauv khoom ) yog qhov zoo. Yog lub kaum sab xis ntawm ob vectors yog obtuse, ces lawv khoom scalar yog tsis zoo.
Ib yam li ntawd, dab tsi yog qhov khoom ntawm ob lub tsev vectors zoo sib xws?
Cov dot khoom ntawm ob chav vectors yog cosine ofangle ntawm lub cov duab . tam sim no qhov loj ntawm ob leeg yog 1 ntawm lawv unit vector.
Yuav ua li cas koj thiaj paub yog tias ob lub vectors yog tib yam uas siv cov khoom dot?
Perpendicular, vim lawv dot khoom yog zero. Plaub: Ob tug vectors yog perpendicular yog lawv dot khoom yog zero, thiab parallel yog lawv dot khoom yog 1.
Pom zoo:
Cov kab lus hloov sab hauv cov ces kaum piav qhia txoj haujlwm ntawm ob lub kaum sab xis li cas?
Hloov sab hauv cov ces kaum yog tsim los ntawm ib tug transversal intersecting ob parallel kab. Lawv nyob nruab nrab ntawm ob qho tib si kab tab sis nyob rau sab nraud ntawm lub transversal, tsim ob khub (plaub tag nrho cov ces kaum) ntawm cov ces kaum sab hauv. Hloov cov ces kaum sab hauv yog congruent, txhais tau tias lawv muaj qhov sib npaug
Vim li cas lub cube cag ntawm tus lej tsis zoo yog tus lej tsis zoo?
Tus lej tsis zoo lub voos xwmfab hauv paus yuav tsis zoo Txij li qhov ntsuas tus lej txhais tau tias tsa nws mus rau lub zog thib 3 - uas yog khib - lub voos xwmfab ntawm cov lej tsis zoo yuav tsum yog qhov tsis zoo. Thaum lub qhov hluav taws xob tawm (xiav), qhov tshwm sim tsis zoo. Thaum lub qhov hluav taws xob qhib (daj), qhov tshwm sim yog qhov zoo
Yuav ua li cas cov khoom siv caj ces hauv txhua lub xov tooj tshiab tsim los ntawm kev faib tawm ntawm tes sib piv nrog cov khoom siv caj ces hauv lub xov tooj qub?
Mitosis tshwm sim nyob rau hauv ob lub nuclei uas zoo tib yam rau thawj nucleus. Yog li, ob lub hlwb tshiab tsim tom qab kev faib tawm ntawm tes muaj tib yam khoom siv caj ces. Thaum lub sij hawm mitosis, chromosomes condense los ntawm chromatin. Thaum saib nrog lub microscope, chromosomes pom nyob rau hauv lub nucleus
Vim li cas tsis zoo thiab tsis zoo yog qhov zoo?
Thaum koj muab qhov tsis zoo los ntawm qhov tsis zoo koj tau txais qhov zoo, vim tias ob lub cim tsis zoo raug muab tso tseg
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