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SMK Teknologi dan Rekayasa

Soal 48 Operasi Vektor


Jika\ vektor\ \bar{a}=2\bar{i}-3\tilde{j}+4\tilde{k}\ dan\ \bar{b}=5\tilde{j}+\tilde{k},\ maka\ \bar{a}.\bar{b}=....\\a.\ -9\ \ \ \ \ \ \ \ \ \ b.\ -11\ \ \ \ \ \ \ \ \ \ c.\ \ 7\ \ \ \ \ \ \ \ \ \ d.\ \ 8\ \ \ \ \ \ \ \ \ \ e.\ \ 11
Jawaban: b

\bar{a}=2\bar{i}-3\tilde{j}+4\tilde{k}\\\bar{b}=0\bar{i}+5\tilde{j}+\tilde{k}
\begin{array}{rcl}\bar{a}.\bar{b}&=&2.0+(-3).5+4.1\\&=&0+(-15)+4\\&=& -11\end{array}

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