Dot khoom txhais li cas?
Dot khoom txhais li cas?

Video: Dot khoom txhais li cas?

Video: Dot khoom txhais li cas?
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Hauv lej, the dot khoom los yog khoom scalar yog ib qho kev ua algebraic uas siv ob qhov sib npaug ntawm qhov sib npaug ntawm cov lej (feem ntau ua haujlwm vectors) thiab xa rov qab ib tus lej. Geometrically, nws yog khoom ntawm Euclidean qhov loj ntawm ob lub vectors thiab cosine ntawm lub kaum sab xis ntawm lawv.

Tsis tas li ntawd, qhov khoom dot qhia peb li cas?

Ua ntej peb hais tias tus dot khoom sawv cev rau kev sib raug zoo ntawm ob lub vectors, thiab sab laug nws ntawm qhov ntawd. Hais tias yog, lub dot khoom ntawm ob vectors yuav muab sib npaug rau cov cosine ntawm lub kaum sab xis ntawm cov vectors, lub sij hawm qhov ntev ntawm txhua qhov vectors.

vim li cas dot khoom cos? Hauv dot khoom peb siv cos theta vim nyob rau hauv hom no khoom 1.) Ib tug vector yog qhov projection tshaj lwm tus. 2.) Qhov kev ncua deb yog them raws ib axis los yog nyob rau hauv cov kev taw qhia ntawm quab yuam thiab tsis xav tau perpendicular axis los yog sin theta.

Tom qab ntawd, dot khoom piv txwv yog dab tsi?

Piv txwv : laim Dot Khoom for: a·b = |a| × |b| x cos(θ) a·b = |a| × |b| x cos(90°) a· b = |a| × |b| x 0. a· b = 0.

Nws txhais li cas yog tias qhov khoom dot ntawm ob vectors sib npaug rau xoom?

Thaum dot khoom yog xoom implies lub ob vectors yog perpendicular. Thaum twg ntoo khaub lig khoom yog xoom implies lub ob vectors yog thaum uas tig mus. Ob tug vectors , A thiab B, yog xws li lawv tus ntoo khaub lig khoom , A x B = 0.

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