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JEE Main & Advanced Physics NLM, Friction, Circular Motion Question Bank Critical Thinking Questions

  • question_answer
    A stick of 1 m is moving with velocity of \[2.7\times {{10}^{8}}m{{s}^{-1}}\]. What is the apparent length of the stick \[(c=3\times {{10}^{8}}m{{s}^{-1}})\]                                     [BHU 1995]

    A) 10 m   

    B) 0.22 m

    C) 0.44 m

    D) 2.4 m

    Correct Answer: C

    Solution :

        \[l={{l}_{0}}\sqrt{1-\frac{{{v}^{2}}}{{{c}^{2}}}}\]\[=1\sqrt{1-{{\left( \frac{2.7\times {{10}^{8}}}{3\times {{10}^{8}}} \right)}^{2}}}\Rightarrow l=0.44\ m\]


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