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Diketahui A(4, 0, 0), B(0, - 4, 0), dan C(0, 0, 4). Panjang vektor proyeksi A C ke vektor A B → adalah...

Diketahui A(4, 0, 0), B(0, - 4, 0), dan C(0, 0, 4). Panjang vektor proyeksi  ke vektor  adalah...

  1. begin mathsize 12px style fraction numerator square root of 2 over denominator 2 end fraction end style  

  2. begin mathsize 12px style square root of 2 end style  

  3. begin mathsize 12px style fraction numerator 3 square root of 2 over denominator 2 end fraction end style  

  4. begin mathsize 12px style 2 square root of 2 end style   

  5. begin mathsize 12px style 3 square root of 2 end style  

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F. Kurnia

Master Teacher

Mahasiswa/Alumni Universitas Jember

Jawaban terverifikasi

Pembahasan

Ingat! Jika titik dan , maka: Misal dan maka: Misal adalah proyeksi skalar vektor pada vektor , maka Diketahui titik A(4, 0, 0), B(0, - 4, 0) dan C(0, 0, 4), maka panjang vektor proyeksi ke vektor yaitu: Misal adalahproyeksi ke vektor , maka: Jadi, panjang vektorproyeksi ke vektor adalah

Ingat!

Jika titik begin mathsize 12px style P open parentheses a subscript 1 comma space a subscript 2 comma space a subscript 3 close parentheses end style dan begin mathsize 12px style Q open parentheses b subscript 1 comma space b subscript 2 comma space c subscript 3 close parentheses end style , maka:

begin mathsize 12px style stack P Q with rightwards arrow on top equals Q minus P equals open parentheses table row cell b subscript 1 end cell row cell b subscript 2 end cell row cell b subscript 3 end cell end table close parentheses minus open parentheses table row cell a subscript 1 end cell row cell a subscript 2 end cell row cell a subscript 3 end cell end table close parentheses end style  

Misal begin mathsize 12px style P with rightwards arrow on top equals open parentheses a subscript 1 comma space a subscript 2 comma space a subscript 3 close parentheses end style dan begin mathsize 12px style Q with rightwards arrow on top equals open parentheses b subscript 1 comma space b subscript 2 comma space c subscript 3 close parentheses end style maka:

begin mathsize 12px style P with rightwards arrow on top. Q with rightwards arrow on top equals open parentheses a subscript 1 b subscript 1 plus a subscript 2 b subscript 2 plus a subscript 3 b subscript 3 close parentheses open vertical bar P with rightwards arrow on top close vertical bar equals square root of open parentheses a subscript 1 close parentheses squared plus open parentheses a subscript 2 close parentheses squared plus open parentheses a subscript 3 close parentheses squared end root end style  

Misal begin mathsize 12px style Z with rightwards arrow on top end style adalah proyeksi skalar vektor begin mathsize 12px style P with rightwards arrow on top end style pada vektor begin mathsize 12px style Q with rightwards arrow on top end style , maka

begin mathsize 12px style Z with rightwards arrow on top equals fraction numerator P with rightwards arrow on top. Q with rightwards arrow on top over denominator open vertical bar Q with rightwards arrow on top close vertical bar end fraction end style  

Diketahui titik A(4, 0, 0), B(0, - 4, 0) dan C(0, 0, 4), maka panjang vektor proyeksi begin mathsize 12px style stack A C with rightwards arrow on top end style ke vektor stack size 12px A size 12px B with size 12px rightwards arrow on top yaitu:

begin mathsize 12px style stack A C with rightwards arrow on top equals C minus A equals open parentheses table row 0 row 0 row 4 end table close parentheses minus open parentheses table row 4 row 0 row 0 end table close parentheses equals open parentheses table row cell negative 4 end cell row 0 row 4 end table close parentheses stack A B with rightwards arrow on top equals B minus A equals open parentheses table row 0 row cell negative 4 end cell row 4 end table close parentheses minus open parentheses table row 4 row 0 row 0 end table close parentheses equals open parentheses table row cell negative 4 end cell row cell negative 4 end cell row 4 end table close parentheses end style   

Misal begin mathsize 12px style Z with rightwards arrow on top end style adalah proyeksi begin mathsize 12px style stack A C with rightwards arrow on top end style ke vektor stack size 12px A size 12px B with size 12px rightwards arrow on top , maka:

begin mathsize 12px style Z with rightwards arrow on top equals fraction numerator stack A C with rightwards arrow on top. stack A B with rightwards arrow on top over denominator open vertical bar stack A B with rightwards arrow on top close vertical bar end fraction Z with rightwards arrow on top equals fraction numerator open parentheses table row cell negative 4 end cell row 0 row 4 end table close parentheses. open parentheses table row cell negative 4 end cell row cell negative 4 end cell row 4 end table close parentheses over denominator square root of open parentheses negative 4 close parentheses squared plus open parentheses negative 4 close parentheses squared plus 0 squared end root end fraction Z with rightwards arrow on top equals fraction numerator 16 plus 0 plus 0 over denominator square root of 32 end fraction Z with rightwards arrow on top equals fraction numerator 16 over denominator 4 square root of 2 end fraction Z with rightwards arrow on top equals fraction numerator 4 over denominator square root of 2 end fraction Z with rightwards arrow on top equals 2 square root of 2 end style   

 

Jadi, panjang vektor proyeksi begin mathsize 12px style stack A C with rightwards arrow on top end style ke vektor stack size 12px A size 12px B with size 12px rightwards arrow on top adalah begin mathsize 12px style 2 square root of 2 end style 

 

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jawaban nya tidak sesuai soal, perhatikan soal vektor B dengan hasil pencarian vektor AB

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