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Pertanyaan

Diketahui P ( 3 , 5 , 0 ) , Q ( 1 , 3 , − 1 ) , dan R ( − 1 , 4 , 1 ) . Hitunglah panjang vektor proyeksi (proyeksi skalar) PQ ​ terhadap vektor PR .

Diketahui . Hitunglah panjang vektor proyeksi (proyeksi skalar)  terhadap vektor 

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N. Indah

Master Teacher

Mahasiswa/Alumni Universitas Diponegoro

Jawaban terverifikasi

Jawaban

panjang vektor proyeksi (proyeksi skalar) terhadap vektor adalah .

 panjang vektor proyeksi (proyeksi skalar) stack P Q with rightwards arrow on top terhadap vektor stack P R with rightwards arrow on top adalah 3 over 2 square root of 2

Pembahasan

Diketahui , maka: Dan Sehingga panjang vektor proyeksi: Dengan demikian,panjang vektor proyeksi (proyeksi skalar) terhadap vektor adalah .

Diketahui P left parenthesis 3 comma 5 comma 0 right parenthesis comma space Q left parenthesis 1 comma 3 comma negative 1 right parenthesis comma text  dan end text space R left parenthesis negative 1 comma 4 comma 1 right parenthesis, maka:

table attributes columnalign right center left columnspacing 0px end attributes row cell stack P Q with rightwards arrow on top end cell equals cell Q minus P end cell row blank equals cell left parenthesis 1 minus 3 comma space 3 minus 5 comma space minus 1 minus 0 right parenthesis end cell row blank equals cell left parenthesis negative 2 comma space minus 2. space minus 1 right parenthesis end cell end table

Dan

table attributes columnalign right center left columnspacing 0px end attributes row cell stack P R with rightwards arrow on top end cell equals cell R minus P end cell row blank equals cell left parenthesis negative 1 minus 3 comma space 4 minus 5 comma space 1 minus 0 right parenthesis end cell row blank equals cell left parenthesis negative 4 comma space minus 1. space 1 right parenthesis end cell end table

Sehingga panjang vektor proyeksi:

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 fraction numerator stack P Q with rightwards arrow on top times stack P R with rightwards arrow on top over denominator open vertical bar stack P R with rightwards arrow on top close vertical bar end fraction end cell row blank equals cell fraction numerator left parenthesis negative 2 right parenthesis left parenthesis negative 4 right parenthesis plus left parenthesis negative 2 right parenthesis left parenthesis negative 1 right parenthesis plus left parenthesis negative 1 right parenthesis left parenthesis 1 right parenthesis over denominator square root of left parenthesis negative 4 right parenthesis squared plus left parenthesis negative 1 right parenthesis squared plus 1 to the power of 2 end exponent end root end fraction end cell row blank equals cell fraction numerator 8 plus 2 minus 1 over denominator square root of 18 end fraction end cell row blank equals cell fraction numerator 9 over denominator 3 square root of 2 end fraction end cell row blank equals cell fraction numerator 3 over denominator square root of 2 end fraction cross times fraction numerator square root of 2 over denominator square root of 2 end fraction end cell row blank equals cell 3 over 2 square root of 2 end cell end table

Dengan demikian, panjang vektor proyeksi (proyeksi skalar) stack P Q with rightwards arrow on top terhadap vektor stack P R with rightwards arrow on top adalah 3 over 2 square root of 2

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