Quiz Vektor Matematika

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| By Erli
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Erli
Community Contributor
Quizzes Created: 1 | Total Attempts: 5,649
Questions: 5 | Attempts: 5,649

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Quiz Vektor Matematika - Quiz

QUIZ VEKTOR MATEMATIKA & PEMBAHASAN


Questions and Answers
  • 1. 

    Diketahui vektor a = 2i – 6j – 3k dan b = 4i + 2j – 4k . Panjang proyeksi vektor a pada b adalah…..

    • A.

      4/3

    • B.

      8/9

    • C.

      ¾

    • D.

      3/8

    • E.

      8/36

    Correct Answer
    A. 4/3
    Explanation
    Panjang masing-masing vektor, jika nanti diperlukan datanya:
    |a|=√(2^2+(〖-6)〗^2+(-3)^2 )=√49=7
    |b|=√(4^2+〖(2)〗^2+〖(-4)〗^2 )=√36=6
    Proyeksi vektor a pada vektor b, namakan c:
    |c|=(a.b)/|b|
    |c|=((2i-6j-3k)(4i+2j-2k))/6
    |c|=(8-12+12)/6=4/3

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  • 2. 

    Diberikan tiga buah vektor masing-masing:a = 6p i + 2p j − 8 kb = −4 i + 8j + 10 kc = − 2 i + 3 j − 5 kJika vektor a tegak lurus b, maka vektor a − c adalah....

    • A.

      − 58 i − 20 j − 3k

    • B.

      − 58 i − 23 j − 3k

    • C.

      − 62 i − 17 j − 3k

    • D.

      − 62 i − 20 j − 3k

    • E.

      − 62 i − 23 j − 3k

    Correct Answer
    B. − 58 i − 23 j − 3k
    Explanation
    Jadi hasilnya adalah − 58 i − 23 j − 3k.

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  • 3. 

    Ditentukan A(4 , 7 , 0) , B(6 , 10 , –6) dan C(1 , 9 , 0). AB dan AC wakil-wakil dari vektor u dan v. Besar sudut antara u dan v adalah....

    • A.

      0

    • B.

      1/4 π

    • C.

      π

    • D.

      3/4 π

    • E.

      1/2 π

    Correct Answer
    E. 1/2 π
    Explanation
    Tentukan vektor u dan v terlebih dulu:
    u = AB = B − A = (6 , 10 , –6) − (4 , 7 , 0) = (2, 3, −6) → u = 2i + 3j − 6k
    v = AC = C − A = (1 , 9 , 0) − (4 , 7 , 0) = (− 3, 2, 0) → v = − 3i + 2j
    cos∝=(u.v)/|u||v| =(-6+6+0)/(√49 √12)=0
    Sudut dengan nilai cosinus nol adalah 90° atau 1/2 π

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  • 4. 

    Diketahui segitiga ABC dengan A(2, 1, 2), B(6, 1, 2), dan C(6, 5, 2). Jika vektor u mewakili vektor AB dan vektor v mewakili vektor AC, maka sudut yang dibentuk oleh vektor u dan v adalah… 

    • A.

      30°

    • B.

      45°

    • C.

      60°

    • D.

      90°

    • E.

      120°

    Correct Answer
    B. 45°
    Explanation
    Jadi sudut yang dibentuk oleh vektor u dan v adalah 45°.

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  • 5. 

    Nilai p agar vektor pi + 2j -6k dan 4i - 3j + k saling tegak lurus adalah....

    • A.

      -3

    • B.

      -2

    • C.

      -1

    • D.

      2

    • E.

      3

    Correct Answer
    E. 3
    Explanation
    nilai p adalah 3.

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  • Current Version
  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Dec 13, 2015
    Quiz Created by
    Erli
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