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Verified answer
Diket :a = k. (1/√3 , 1/√3 , 1/√3)
Merupakan vektor satuan, maka nila k = __?
Jawab :
K = 1/( [1/√3]² + [1/√3]² + [1/√3]² )
K = 1/ (1/3 + 1/3 + 1/3)
K = 1/ (3/3)
K = 1/(1)
K = 1
Jawaban : B
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FZA
Verified answer
Vektor satuan adalah vektor yg panjangnya sama dengan 1a = k (1/√3, 1/√3, 1/√3)
a = (k/√3, k/√3, k/√3)
|a| = 1
√((k/√3)² + (k/√3)² + (k/√3)²) = 1
√(k²/3 + k²/3 + k²/3) = 1 ====> kedua ruas dikuadratkan
k²/3 + k²/3 + k²/3 = 1
3k²/3 = 1
k² = 1
k = ± 1
k = 1 atau k = -1