NEET UG PHYSICS MCQ: MOTION IN PLANE

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Application +4 | -1

\mathrm{\vec A} = 3\hat i - \hat j + 7\hat k\,and\,\mathrm{\vec B} = 5\hat i - \hat j + 9\hat k

the direction cosine m of the vector

\mathrm{\vec A} + \mathrm{\vec B}

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Correct option: A

Zero

Option A (Zero) is correct because the y-component of the sum of the vectors is zero, making the direction cosine along the y-axis zero.

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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)