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Diketahui vektor u = ⎝ ⎛ ​ 3 t 1 ​ ⎠ ⎞ ​ dan v = ⎝ ⎛ ​ 3 5 2 ​ ⎠ ⎞ ​ . Jika proyeksi skalar orthogonal vektor u pada vektor v = 15 4 5 ​ ​ , maka t = ...

Diketahui vektor  dan . Jika proyeksi skalar orthogonal vektor  pada vektor , maka  ...

  1. negative 5 

  2. negative 2 

  3. negative 1 half 

  4. 1 half 

  5. 2 

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tidak ada pilihan jawaban yang tepat.

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Pembahasan

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Diketahui: Pekalian vektor: Panjang vektor : Proyeksi orthogonal pada : Sehingga, nilai . Jadi, tidak ada pilihan jawaban yang tepat.

Diketahui:

u with rightwards arrow on top equals open parentheses table row 3 row t row 1 end table close parentheses
v with rightwards arrow on top equals open parentheses table row 3 row 5 row 2 end table close parentheses
v with rightwards arrow on top equals fraction numerator 4 square root of 5 over denominator 15 end fraction

Pekalian vektor:

table attributes columnalign right center left columnspacing 0px end attributes row cell u with rightwards arrow on top times v with rightwards arrow on top end cell equals cell open parentheses table row 3 row t row 1 end table close parentheses times open parentheses table row 3 row 5 row 2 end table close parentheses end cell row blank equals cell 3 times 3 plus t times 5 plus 1 times 2 end cell row blank equals cell 9 plus 5 t plus 2 end cell row blank equals cell 11 plus 5 t end cell end table 

Panjang vektor v with rightwards arrow on top:

table attributes columnalign right center left columnspacing 0px end attributes row cell open vertical bar v with rightwards arrow on top close vertical bar end cell equals cell square root of 3 squared plus 5 squared plus 2 squared end root end cell row blank equals cell square root of 9 plus 25 plus 4 end root end cell row blank equals cell square root of 38 end cell end table

Proyeksi orthogonal u with rightwards arrow on top pada v with rightwards arrow on top:

table attributes columnalign right center left columnspacing 0px end attributes row cell fraction numerator u with rightwards arrow on top times v with rightwards arrow on top over denominator open vertical bar v with rightwards arrow on top close vertical bar end fraction end cell equals cell fraction numerator 4 square root of 5 over denominator 15 end fraction end cell row cell fraction numerator 11 plus 5 t over denominator square root of 38 end fraction end cell equals cell fraction numerator 4 square root of 5 over denominator 15 end fraction end cell row cell 15 open parentheses 11 plus 5 t close parentheses end cell equals cell 4 square root of 5 cross times square root of 38 end cell row cell 165 plus 75 t end cell equals cell 4 square root of 190 end cell row cell 75 t end cell equals cell 4 square root of 190 minus 165 end cell row t equals cell fraction numerator 4 square root of 190 minus 165 over denominator 75 end fraction end cell end table 

Sehingga, nilai t equals fraction numerator 4 square root of 190 minus 165 over denominator 75 end fraction.

Jadi, tidak ada pilihan jawaban yang tepat.

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