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Pertanyaan

Jika vektor p ​ = 5 j ​ + 2 i dan q ​ = 4 i − 3 j ​ . Panjang proyeksi vektor p ​ + q ​ pada vektor q ​ adalah ...

Jika vektor  dan . Panjang proyeksi vektor  pada vektor  adalah ...space

  1. 6 comma 0 

  2. 4 comma 8 

  3. 3 comma 6 

  4. 3 comma 0 

  5. 2 comma 4 

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A. Armanda

Master Teacher

Mahasiswa/Alumni Universitas Indraprasta PGRI

Jawaban terverifikasi

Jawaban

jawaban yang tepat adalah C.

jawaban yang tepat adalah C.

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Pembahasan

Perhatikan gambar berikut. Proyeksi vektor ortogonal pada dapat dirumuskan: dengan: Panjang vektor dapat dirumuskan: dengan: Diketahuivektor dan , maka tentukan hasil dari . Panjang proyeksi vektor pada vektor : Maka, proyeksi vektor pada vektor adalah . Tentukan panjangproyeksi vektor pada vektor . Sehingga, panjangproyeksi vektor pada vektor adalah . Jadi, jawaban yang tepat adalah C.

Perhatikan gambar berikut.



 

Proyeksi vektor ortogonal a with rightwards arrow on top pada b with rightwards arrow on top dapat dirumuskan:

c with rightwards arrow on top equals fraction numerator a with rightwards arrow on top times b with rightwards arrow on top over denominator open vertical bar b with rightwards arrow on top close vertical bar squared end fraction times b with rightwards arrow on top  

dengan:

table attributes columnalign right center left columnspacing 0px end attributes row cell c with rightwards arrow on top end cell equals cell proyeksi space vektor space ortogonal space a with rightwards arrow on top space pada space b with rightwards arrow on top end cell row cell open vertical bar b with rightwards arrow on top close vertical bar end cell equals cell panjang space vektor space b with rightwards arrow on top end cell end table  

Panjang vektor b with rightwards arrow on top dapat dirumuskan:

open vertical bar b with rightwards arrow on top close vertical bar equals square root of b subscript 1 squared plus b subscript 2 squared end root 

dengan:

table attributes columnalign right center left columnspacing 0px end attributes row cell b subscript 1 end cell equals cell elemen space vektor space b with rightwards arrow on top space pada space sumbu space x end cell row cell b subscript 2 end cell equals cell elemen space vektor space stack b space with rightwards arrow on top pada space sumbu space y end cell end table 

Diketahui vektor p with rightwards arrow on top equals 5 j with rightwards arrow on top plus 2 i with rightwards arrow on top dan q with rightwards arrow on top equals 4 i with rightwards arrow on top minus 3 j with rightwards arrow on top, maka tentukan hasil dari p with rightwards arrow on top plus q with rightwards arrow on top.

Panjang proyeksi vektor p with rightwards arrow on top plus q with rightwards arrow on top pada vektor q with rightwards arrow on top:

table attributes columnalign right center left columnspacing 0px end attributes row cell c with rightwards arrow on top end cell equals cell fraction numerator open parentheses p with rightwards arrow on top plus q with rightwards arrow on top close parentheses times q with rightwards arrow on top over denominator open vertical bar q with rightwards arrow on top close vertical bar squared end fraction times q with rightwards arrow on top end cell row blank equals cell fraction numerator open parentheses table row 6 row 2 end table close parentheses times open parentheses table row 4 row cell negative 3 end cell end table close parentheses over denominator open parentheses square root of 4 squared plus open parentheses negative 3 close parentheses squared end root close parentheses squared end fraction times open parentheses table row 4 row cell negative 3 end cell end table close parentheses end cell row blank equals cell fraction numerator 6 times 4 plus 2 times open parentheses negative 3 close parentheses over denominator 5 squared end fraction times open parentheses table row 4 row cell negative 3 end cell end table close parentheses end cell row blank equals cell 18 over 25 times open parentheses table row 4 row cell negative 3 end cell end table close parentheses end cell row blank equals cell open parentheses table row cell 18 over 25 times 4 end cell row cell 18 over 25 times open parentheses negative 3 close parentheses end cell end table close parentheses end cell row blank equals cell open parentheses table row cell 2 comma 88 end cell row cell negative 2 comma 16 end cell end table close parentheses end cell end table 

Maka, proyeksi vektor p with rightwards arrow on top plus q with rightwards arrow on top pada vektor q with rightwards arrow on top adalah c with rightwards arrow on top equals 2 comma 88 i with rightwards arrow on top minus 2 comma 16 j with rightwards arrow on top.

Tentukan panjang proyeksi vektor p with rightwards arrow on top plus q with rightwards arrow on top pada vektor q with rightwards arrow on top.

table attributes columnalign right center left columnspacing 0px end attributes row cell open vertical bar c with rightwards arrow on top close vertical bar end cell equals cell square root of x squared plus y squared end root end cell row blank equals cell square root of 2 comma 88 squared plus open parentheses negative 2 comma 16 close parentheses squared end root end cell row blank equals cell square root of 12 comma 96 end root end cell row blank equals cell 3 comma 6 end cell end table 

Sehingga, panjang proyeksi vektor p with rightwards arrow on top plus q with rightwards arrow on top pada vektor q with rightwards arrow on top adalah 3 comma 6.

Jadi, jawaban yang tepat adalah C.

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