Video: Yuav ua li cas koj nrhiav tau daim ntawv tivthaiv ntawm ib vector muab qhov magnitude thiab lub kaum sab xis?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
VIDEO
Khaws qhov no hauv kev xav, puas yog 0 ib chav vector?
A unit vector yog a vector uas muaj qhov loj ntawm 1. Cov ntawv sau sawv cev rau tus qauv, lossis qhov loj, ntawm vector v. Basic unit vectors yog i = (1, 0 ) thiab j = ( 0 , 1) uas yog ntev 1 thiab muaj cov lus qhia raws qhov zoo x-axis thiab y-axis feem.
Tsis tas li ntawd, cov khoom siv zoo li cas? Cov daim ntawv tivthaiv ntawm ib vector yog tus khub txiav txim uas piav qhia txog kev hloov pauv hauv x- thiab y-tus nqi. Hauv daim duab saum toj no x1= 0, y1= 0 thiab x2= 2, y2=5. Ob tug vectors yog sib npaug yog tias lawv muaj tib qhov loj thiab kev taw qhia. Lawv yog parallel yog hais tias lawv muaj tib yam los yog opposite direction.
Tsis tas li ntawd, koj txhais li cas los ntawm qhov loj?
Hauv physics, qhov loj txhais tau hais tias qhov loj ntawm qhov loj los yog qhov twg. Ib vector muaj a qhov loj thiab ib txoj kev, nws qhov loj yog tus lej tus nqi ntawm nws qhov ntev, qhov loj lossis ntau. Lub scalar hauv physics yog txhais los ntawm qhov loj los yog kom muaj nuj nqis thiab tsis yog los ntawm kev taw qhia.
Koj pom qhov loj thiab lub kaum sab xis ntawm vector li cas?
- Siv qhov sib npaug. mus nrhiav qhov magnitude, uas yog 1.4.
- Apply the equation = tan–1(y/x) nrhiav lub kaum sab xis: tan–1(1.0/–1.0) = –45°°. Txawm li cas los xij, nco ntsoov tias lub kaum sab xis yuav tsum yog nyob nruab nrab ntawm 90 degrees thiab 180 degrees vim tias thawj vector tivthaiv tsis zoo thiab qhov thib ob yog qhov zoo.
Pom zoo:
Yuav ua li cas koj pom lub kaum sab xis nruab nrab muab qhov chaw thiab lub vojvoog ntawm ib lub sector?
Kev txiav txim siab Central Angle Los ntawm Sector Area (πr2) × (central angle in degrees ÷ 360 degrees) = sector area. Yog hais tias lub hauv paus lub kaum sab xis ntsuas nyob rau hauv radians, lub mis hloov mus ua: sector cheeb tsam = r2 × (central kaum hauv radians ÷ 2). (θ ÷ 360 degree) × πr2. (52.3 ÷ 100π) × 360. (52.3 ÷ 314) × 360
Yuav ua li cas koj nrhiav tau tus kab pheeb ces kaum ntawm txoj cai kaum sab xis?
Txhawm rau nrhiav qhov ntev ntawm kab pheeb ces kaum (orhypotenuse) ntawm txoj cai daim duab peb sab, hloov qhov ntev ntawm ob sab perpendicular rau hauv cov mis a2 + b2 = c2, qhov twg a thiab b yog qhov ntev ntawm sab perpendicular thiab c yog qhov ntev ntawm lub hypotenuse
Koj tuaj yeem ua pov thawj li cas 2 daim duab peb sab zoo sib xws siv lub kaum sab xis sab SAS zoo sib xws postulate?
SAS Similarity Theorem hais tias yog ob sab hauv ib daim duab peb sab yog proportional rau ob sab hauv lwm daim duab peb sab thiab lub kaum sab xis nyob rau hauv ob qho tib si congruent, ces ob daim duab peb sab zoo ib yam. Ib qho kev hloov pauv zoo sib xws yog ib lossis ntau qhov kev hloov pauv tsis tu ncua ua raws li kev dilation
Yuav ua li cas koj nrhiav tau daim ntawv tivthaiv ntawm ob lub ntsiab lus?
Muab ob lub ntsiab lus vectors nrog ib qho sawv cev rau qhov pib taw tes thiab lwm qhov sawv cev rau lub davhlau ya nyob twg taw tes. Daim ntawv tivthaiv ntawm vector tsim los ntawm ob lub ntsiab lus vectors yog muab los ntawm cov khoom ntawm lub davhlau ya nyob twg taw tes rho tawm cov khoom sib txuas ntawm qhov pib taw tes
Dab tsi yog kev sib raug zoo ntawm sab nrauv thiab sab hauv lub kaum sab xis ntawm daim duab peb sab?
Cov kaum sab hauv yog hu ua Sab hauv cov ces kaum. Cov lej ntawm cov kaum sab hauv ntawm daim duab peb sab yog ib txwm 180 degrees. Lub kaum sab nrauv yog lub kaum sab xis ntawm ib sab ntawm ib qho duab, thiab ib txoj kab txuas ntxiv los ntawm sab tom ntej. Qhov sib npaug ntawm lub kaum sab nrauv thiab nws lub kaum sab hauv uas nyob ib sab kuj yog 180 degrees