NEET UG PHYSICS MCQ: MOTION IN PLANE

1 Easy

1 of 1

Understanding +4 | -1

If a vector

\vec P

make angles

\alpha ,\,\beta ,

and

\gamma

respectively with the

X,\,\,Y

and

Z

axes. Then

{\sin ^2}\alpha \,\, + \,\,{\sin ^2}\beta \,\, + \,\,{\sin ^2}\gamma \,\, =

View answer and explanation

Correct option: C

The correct answer is 2 because the sum of the squares of the direction cosines is 1, and the sum of the squares of the direction sines is 2.

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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)