NEET UG PHYSICS MCQ: MOTION IN PLANE

1 Easy

1 of 1

Application +4 | -1

If two directional cosine of a vectors are

\frac{1}{{\sqrt 2 }}

and

\frac{1}{{\sqrt 3 }}

then the value of third directional cosine is

View answer and explanation

Correct option: A

\frac{1}{{\sqrt 6 }}

Option A (

\frac{1}{{\sqrt 6 }}

) is correct because the sum of the squares of the directional cosines must equal 1.

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\mathrm{\vec a}\,and\,\mathrm{\vec b}

\mathrm{\vec a}\,and\,\mathrm{\vec b}

\overrightarrow P \,\,.\,\,\overrightarrow Q = 0\,and\,\overrightarrow P \,\, \times \,\,\overrightarrow Q = 0

\overrightarrow Q \,and\,\overrightarrow R

\vec{A}=3 \hat{i}+4 \hat{j}

\vec{B}=6 \hat{i}+8 \hat{j}

A

B

\overrightarrow{\mathrm{A}}

\overrightarrow{\mathrm{B}}

{\cot ^{ - 1}}\left( 2 \right)