If $0.5\hat i + 0.8\hat j + {\rm{c\hat k}}$ is a unit vector, then the value of c is

NEET UG PHYSICS MCQ: MOTION IN PLANE

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0.5\hat i + 0.8\hat j + \mathrm{c\hat k}

is a unit vector, then the value of c is

View answer and explanation

Correct option: A

\sqrt {0.11}

Option A (

\sqrt {0.11}

) is correct because the magnitude of a unit vector must be 1, and this value of c satisfies that condition.

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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)