JEE Main & Advanced Physics Two Dimensional Motion Question Bank Uniform Circular Motion

  • question_answer
    What is the value of linear velocity, if \[\vec{\omega }=3\hat{i}-4\hat{j}+\hat{k}\] and \[\vec{r}=5\hat{i}-6\hat{j}+6\hat{k}\]                            [Pb. PMT 2000]

    A)              \[6\hat{i}+2\hat{j}-3\hat{k}\]

    B)                      \[-18\hat{i}-13\hat{j}+2\hat{k}\]

    C)             \[4\hat{i}-13\hat{j}+6\hat{k}\]

    D)                      \[6\hat{i}-2\hat{j}+8\hat{k}\]

    Correct Answer: B

    Solution :

                    \[\overrightarrow{v}=\overrightarrow{\omega }\times \overrightarrow{r}=\left| \begin{matrix}    {\hat{i}} & {\hat{j}} & {\hat{k}}  \\    3 & -4 & 1  \\    5 & -6 & 6  \\ \end{matrix} \right|=-18\hat{i}-13\hat{j}+2\hat{k}\]


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