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Pertanyaan

Diketahui k = 15 i + 8 j ​ , carilah a. ∣ ∣ ​ k ∣ ∣ ​ b. k (vektor satuan)

Diketahui , carilah

a. 

b.  (vektor satuan)

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E. Lestari

Master Teacher

Mahasiswa/Alumni Universitas Sebelas Maret

Jawaban terverifikasi

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Pembahasan

Gunakan konsep panjang vektor dan vektor satuan, misalkan vektor . Diketahui: a. menentukan panjang vektor atau Diperoleh panjang vektor tersebut adalah . b. menentukan vektor satuan atau . Diperoleh vektor satuannya adalah .

Gunakan konsep panjang vektor dan vektor satuan, misalkan vektor begin mathsize 14px style a with rightwards arrow on top equals a subscript 1 i with hat on top plus a subscript 2 j with hat on top end style.

begin mathsize 14px style table attributes columnalign right center left columnspacing 2px end attributes row cell panjang space vektor space a with rightwards arrow on top equals open vertical bar a with rightwards arrow on top close vertical bar end cell equals cell square root of open parentheses a subscript 1 close parentheses squared plus open parentheses a subscript 2 close parentheses squared end root end cell row cell vektor space satuan space a with rightwards arrow on top equals a with hat on top end cell equals cell fraction numerator a with rightwards arrow on top over denominator open vertical bar a with rightwards arrow on top close vertical bar end fraction end cell end table end style 

Diketahui:

begin mathsize 14px style k with rightwards arrow on top equals 15 i with hat on top plus 8 j with hat on top end style

a. menentukan panjang vektor atau begin mathsize 14px style open vertical bar k with rightwards arrow on top close vertical bar end style

begin mathsize 14px style table attributes columnalign right center left columnspacing 2px end attributes row cell open vertical bar k with rightwards arrow on top close vertical bar end cell equals cell square root of 15 squared plus 8 squared end root end cell row blank equals cell square root of 225 plus 64 end root end cell row blank equals cell square root of 289 end cell row cell open vertical bar k with rightwards arrow on top close vertical bar end cell equals 17 end table end style 

Diperoleh panjang vektor tersebut adalah begin mathsize 14px style open vertical bar k with rightwards arrow on top close vertical bar equals 17 end style.

b. menentukan vektor satuan atau begin mathsize 14px style k with hat on top end style.

begin mathsize 14px style table attributes columnalign right center left columnspacing 2px end attributes row cell k with hat on top end cell equals cell fraction numerator k with rightwards arrow on top over denominator open vertical bar k with rightwards arrow on top close vertical bar end fraction end cell row blank equals cell fraction numerator open parentheses 15 i with hat on top plus 8 j with hat on top close parentheses over denominator 17 end fraction end cell row cell k with hat on top end cell equals cell 15 over 17 i with hat on top plus 8 over 17 j with hat on top end cell end table end style 

Diperoleh vektor satuannya adalah begin mathsize 14px style k with hat on top equals 15 over 17 i with hat on top plus 8 over 17 j with hat on top end style.

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Misalkan P = 8 i + 15 j ​ . a. Carilah ∣ ∣ ​ P ∣ ∣ ​ b. Tunjukkan bahwa ∣ ∣ ​ P ∣ ∣ ​ P ​ adalah vektor satuan.

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