Aspire Faculty ID #16319 · Topic: NIMCET 2010 · Just now
NIMCET 2010

The vectors $\vec{a},\vec{b},\vec{c}$ are equal in length and taken pairwise make equal angles. If $\vec{a}=\hat{i}+\hat{j}$, $\vec{b}=\hat{j}+\hat{k}$ and $\vec{c}$ makes an obtuse angle with $\hat{i}$, then $\vec{c}$ is equal to

Solution

Equal lengths and equal pairwise angles ⇒ vectors form a symmetric set. Dot-products must satisfy: $\vec{a}\cdot\vec{b}=\vec{b}\cdot\vec{c}=\vec{c}\cdot\vec{a}$ Also $\vec{c}$ must make obtuse angle with $\hat{i}$ ⇒ its $i$-component < 0. Solving gives: $\vec{c}=\frac{1}{3}\hat{i}+\frac{4}{3}\hat{j}-\frac{1}{3}\hat{k}$

Previous 10 Questions — NIMCET 2010

Nearest first

Next 10 Questions — NIMCET 2010

Ascending by ID
Ask Your Question or Put Your Review.

loading...