Mibvunzo yemuenzaniso wekuyera

Mienzaniso gumi nemiviri yemibvunzo yekuyera

1. Mhedzisiro yekuyera dhayamita yedombo remabhuru uchishandisa sikuruu maikoromita, inoratidzwa mumufananidzo uri pazasi, sarudza saizi yedhayamita yedombo remabhuru!
A. 4,78 mmMuenzaniso wekuyera mubvunzo 1
B. 5,28 mm
C. 5,70 mm
D. 8,50 mm
E. 9,28 mm
Kukurukurirana
Chinoyera sikuruu chinoshandisa mayuniti emamirimita uye chikero chayo chidiki i0,01 millimita.
Chikero chikuru = 4,5 mamirimita
Chikero cherotary = 27,5 x 0,01 mamirimita = 0,275 mamirimita
Mhedzisiro yekuyera = 4,5 millimeters + 0,275 millimeters = 4,775 millimeters = 4,78 millimeters
Mhinduro chaiyo ndiA.

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Chigadzirwa cheDot chinoshandisa zvikamu zveyuniti vector

Zvinhu zveKuwanza Dot Uchishandisa Zvikamu zveVector Unit

Tinogona kuverenga chigadzirwa chescalar zvakananga kana tichiziva zvikamu zve x, y uye z zvemavector A na B (mavector anozivikanwa).

Kuti tiite chigadzirwa chedot nenzira iyi , tinotanga taita chigadzirwa chedot chemayuniti vectors, tobva taratidza mavectors A naB muzvikamu zvavo, tobva tabvisa chigadzirwa toshandisa chigadzirwa cheyuniti vectors.

Mavector eyuniti i , j na k akaenzana, zvichiita kuti kuverenga kuve nyore. Tichishandisa scalar multiplication equation yakawanikwa pamusoro apa ( AB = AB cos theta ) tinowana:

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Chigadzirwa chakasiyana uchishandisa zvikamu zveyuniti vector

Zvinhu Zvinoshandiswa Pakuwanzana Pamwe Chete Uchishandisa Zvikamu zveVector Unit

Tinogona kuverenga chigadzirwa chakapatsanurwa zvakananga kana tichiziva zvikamu zvemavector. Maitiro acho akafanana neechigadzirwa chedot . Kutanga, tinowanza mavector eyuniti i , j , na k . Chigadzirwa chevector pakati pemavector eyuniti imwe chete i zero.

i x i = j x j = k x k = 0

Nekutarisa kune equation yekuwedzera kwevector yakawanikwa kare (A x B = AB chivi θ) uye hunhu hunopesana nekuchinjana kwe kuwanda kwevector (A x B = - B x A), tobva tawana:

i x j = -j x i = k

j x k = -k x j = i

k x i = – i x k = j

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Vekitari yeyuniti

Kunzwisisa Zvishandiso zveMayuniti 

Vector yeyuniti ivhekitari ine hukuru hwe1. Vector yeyuniti haina mayuniti uye inoshanda kuratidza gwara riri muchadenga. Kuti isiyaniswe nevekitari yenguva dzose, inodhindwa nemabhii matema (emashoko akadhindwa) kana kuti chiratidzo che ^ chinoiswa pamusoro payo (chekunyora).

MuCartesian coordinate system (xyz) tinoshandisa unit vector i kuratidza positive x-axis direction, j kuratidza positive y-axis direction, k kuratidza positive y-axis direction.

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kuwanda kwemuchinjikwa

Chigadzirwa chemarudzi maviri, semuenzaniso mavector A naB , chakanyorwa seA x B ( A cross B ) . Chigadzirwa chemarudzi ose chinonzi chigadzirwa chemarudzi ose nekuti mhedzisiro yekuwanda uku inoburitsa huwandu hwemavector.

Semuenzaniso, vector A nevector B zvinotaridzika semufananidzo uri pazasi.

Kuwanda kwemuchinjikwa 1Kutsanangura chigadzirwa chakasiyana pakati pemavector A dhani B (A x B), tinodhirowa vhekitori A dhani B sezvakaratidzwa mumufananidzo uri pamusoro, uye zvakare zvakaratidzwa zvikamu zvevector B yakatarisana naA, iyo yakaenzana naB sin theta.

Saka, tinogona kutsanangura hukuru hwechigadzirwa chemuchinjikwa chemavectors. A dhani B (A x B) sechibereko chehukuru hwevector A nezvikamu zvevector B yakatarisana nevector A.

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Chigadzirwa cheDot

Mavector haasi manhamba akajairwa, saka kuwanda kwakajairika hakugone kushandiswa zvakananga kwavari. Tinofanira kushandisa kuwanda kwevector. Kune mhando mbiri dzekuwanda kwevector: kuwanda kwedoti uye kuwanda kwemuchinjikwa. Kuwanda kwedoti kunonziwo scalar multiplication nekuti kunogadzira scalar quantity. Kuwanda kwemuchinjikwa kunonziwo vector multiplication nekuti kunogadzira vector quantity. Semuenzaniso, kune mavector maviri, anoti A dhani Bkuwanda kwemavectors eScalar A dhani B zvakataurwa na AB KSezvo nhandare ichishandisa madot notation, kuwanda uku kunonzi chigadzirwa chine madotsikuwanda kwevekita A dhani B zvakataurwa na A x BNekuti inoshandisa notation x, saka kuwanda uku kunonzi kuwanda kwemuchinjikwa.

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Mibvunzo yekufambisa kupisa

Mibvunzo mitatu yekufambisa kupisa

1. Tarisa mufananidzo unotevera!

Kana mapaipi matatu akaiswa mubhokisi regirazi rakavharwa sezvakaratidzwa mumufananidzo. Utsi hunobva mupepa rakaputirwa hunoiswa pamucheto wepaipi B uye huchipinda nepaipi, utsi huchabuda zvakare nepaipi A neC sezvakaratidzwa mumufananidzo. Chiitiko ichi chinoitika nekuda kwekutamiswa kwekupisa ne….

A. convectionMubvunzo 1 wekutamisa kupisa

B. kutungamirwa kwemhepo

C. kutanga

D. mwaranzi

Kukurukurirana

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