Iklan

Pertanyaan

Diketahui vektor p ⇀ ​ = i ⇀ − j ⇀ ​ + 2 k ⇀ dan q ⇀ ​ = 2 i ⇀ − 2 j ⇀ ​ + n k ⇀ . Jika panjang proyeksi vektor p ⇀ ​ pada q ⇀ ​ adalah 2, nilai n = ...

Diketahui vektor  dan . Jika panjang proyeksi vektor  pada  adalah 2, nilai n = ...

  1. 1

  2. 3

  3. 4

  4. 6

  5. 8

Belajar bareng Champions

Brain Academy Champions

Hanya di Brain Academy

Habis dalam

01

:

20

:

20

:

57

Klaim

Iklan

Y. Laksmi

Master Teacher

Mahasiswa/Alumni Universitas Negeri Semarang

Jawaban terverifikasi

Jawaban

nilai n = 1

nilai n = 1

Pembahasan

Proyeksi vektor pada adalah Maka berlaku Diketahui: Maka, nilai n dapat ditentukan sebagai berikut. Jadi, nilai n = 1

Proyeksi vektor begin mathsize 12px style p with rightwards harpoon with barb upwards on top end style pada begin mathsize 12px style q with rightwards harpoon with barb upwards on top end style adalah begin mathsize 12px style r with rightwards harpoon with barb upwards on top end style

Maka berlaku begin mathsize 12px style open vertical bar r with rightwards harpoon with barb upwards on top close vertical bar equals fraction numerator p with rightwards harpoon with barb upwards on top times q with rightwards harpoon with barb upwards on top over denominator open vertical bar q with rightwards harpoon with barb upwards on top close vertical bar end fraction end style

Diketahui:

  • begin mathsize 12px style p with rightwards harpoon with barb upwards on top equals i with rightwards harpoon with barb upwards on top minus j with rightwards harpoon with barb upwards on top plus 2 k with rightwards harpoon with barb upwards on top end style
  • begin mathsize 12px style q with rightwards harpoon with barb upwards on top equals 2 i with rightwards harpoon with barb upwards on top minus 2 j with rightwards harpoon with barb upwards on top plus n k with rightwards harpoon with barb upwards on top end style
  • begin mathsize 12px style open vertical bar r with rightwards harpoon with barb upwards on top close vertical bar equals 2 end style

Maka, nilai n dapat ditentukan sebagai berikut.

begin mathsize 12px style fraction numerator p with rightwards harpoon with barb upwards on top times q with rightwards harpoon with barb upwards on top over denominator open vertical bar q with rightwards harpoon with barb upwards on top close vertical bar end fraction equals open vertical bar r with rightwards harpoon with barb upwards on top close vertical bar  left right double arrow fraction numerator 2 plus 2 plus 2 n over denominator square root of 4 plus 4 plus n squared end root end fraction equals 2  left right double arrow fraction numerator 4 plus 2 n over denominator square root of 8 plus n squared end root end fraction equals 2  left right double arrow 4 plus 2 n equals 2 square root of 8 plus n squared end root  left right double arrow open parentheses 4 plus 2 n close parentheses squared equals 4 open parentheses 8 plus n squared close parentheses  left right double arrow 16 plus 16 n plus 4 n squared equals 32 plus 4 n squared  left right double arrow 16 n equals 16  left right double arrow n equals 1 end style

Jadi, nilai n = 1

Perdalam pemahamanmu bersama Master Teacher
di sesi Live Teaching, GRATIS!

5

Luthfiah Zahra

Bantu banget Makasih ❤️

Jessa

Makasih ❤️

Anna Ardianti

Makasih ❤️

Fauzan sakinata

Mudah dimengerti Bantu banget Ini yang aku cari! Makasih ❤️

ghinata

Pembahasan lengkap banget, ini yang aku cari! Bantu banget. Makasih ❤️

Iklan

Pertanyaan serupa

Diketahui vektor p ⇀ ​ = ( 2 5 ​ ) dan q ⇀ ​ = ( 2 4 ​ ) Tentukan nilai dari 3 ( p ⇀ ​ + q ⇀ ​ ) = ...

1

3.8

Jawaban terverifikasi

RUANGGURU HQ

Jl. Dr. Saharjo No.161, Manggarai Selatan, Tebet, Kota Jakarta Selatan, Daerah Khusus Ibukota Jakarta 12860

Coba GRATIS Aplikasi Roboguru

Coba GRATIS Aplikasi Ruangguru

Download di Google PlayDownload di AppstoreDownload di App Gallery

Produk Ruangguru

Hubungi Kami

Ruangguru WhatsApp

+62 815-7441-0000

Email info@ruangguru.com

[email protected]

Contact 02140008000

02140008000

Ikuti Kami

©2024 Ruangguru. All Rights Reserved PT. Ruang Raya Indonesia