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JEE Main & Advanced Sample Paper JEE Main Sample Paper-8

  • question_answer
    DIRECTION (Qs. 54) Read the following passage and answer the questions that follows: The instantaneous power transfer through \[x=2m\]and \[t=1.25\text{ }\sec ,\]is

    A)  \[10\,J/s\]                         

    B) \[4\pi /3\,\,J/s\]

    C)  \[2\pi /3\,\,J/s\]                             

    D)  0

    Correct Answer: D

    Solution :

     Time period of oscillation \[T=\frac{2\pi }{\omega }=\frac{2\pi }{2\pi }=1\sec .\] Hence, t = 1.25 sec, that is, at T/4 seconds after t = 1 second, the particle is at rest at extreme position. Hence instantaneous power at x = 2 at t = 1.25 sec is zero.


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