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Perhatikan dua vektor berikut! Uraikan vektor u dan v , lalu tuliskan vektor satuannya!

Perhatikan dua vektor berikut!

 

Uraikan vektor  dan , lalu tuliskan vektor satuannya!

  1. ...space 

  2. ...undefined 

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S. Syifa

Master Teacher

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uraian vektor : karena arah vektor ke kiri, maka bernilai negatif. sehingga vektor : sedangkan uraian vektor : maka vektor satuannya adalah:

uraian vektor begin mathsize 14px style u with rightwards arrow on top end style:

begin mathsize 14px style u with rightwards arrow on top subscript x equals u space cos space 30 to the power of straight omicron u with rightwards arrow on top subscript x equals 12 left parenthesis 1 half square root of 3 right parenthesis u with rightwards arrow on top subscript x equals 6 square root of 3 space straight N end style 

begin mathsize 14px style u with rightwards arrow on top subscript y equals u space sin space 30 to the power of straight omicron u with rightwards arrow on top subscript y equals 12 left parenthesis 1 half right parenthesis u with rightwards arrow on top subscript y equals 6 space straight N end style  

karena arah vektor begin mathsize 14px style u with rightwards arrow on top subscript x end style ke kiri, maka begin mathsize 14px style u with rightwards arrow on top subscript x end style bernilai negatif. sehingga vektor undefined:

begin mathsize 14px style u with rightwards arrow on top equals open parentheses negative 6 square root of 3 close parentheses i with hat on top plus 6 j with hat on top end style  

 

sedangkan uraian vektor begin mathsize 14px style v with rightwards arrow on top end style:

begin mathsize 14px style v with rightwards arrow on top subscript x equals v space cos space 45 to the power of straight omicron v with rightwards arrow on top subscript x equals 16 left parenthesis 1 half square root of 2 right parenthesis v with rightwards arrow on top subscript x equals 8 square root of 2 space straight N end style 

begin mathsize 14px style v with rightwards arrow on top subscript y equals v space sin space 45 to the power of straight omicron v with rightwards arrow on top subscript y equals 16 left parenthesis 1 half square root of 2 right parenthesis v with rightwards arrow on top subscript y equals 8 square root of 2 space straight N end style  

maka vektor satuannya adalah:

begin mathsize 14px style v with rightwards arrow on top equals left parenthesis 8 square root of 2 right parenthesis i with hat on top plus left parenthesis 8 square root of 2 right parenthesis j with hat on top end style  

 

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Tiga vektor gaya F 1 ​ , F 2 ​ , dan F 3 ​ sebidang bertitik tangkap sama. Nilai ketiga gaya berturut-turut 3 N, 2 N, dan 4 N. Berapa sudut apit antara dan agar ketiga gaya seimbang?

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