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9th Class Science Work and energy Question Bank Work, Energy and Power

  • question_answer
    Water is falling at the rate of \[1000\,\,kg\] per second. The height of the fall is about\[100\,\,m\]. The potential energy of water when it falls on the blades will be conveyed to them and \[P.E.\] is converted into \[K.E.\] of blades. Estimate the power that could be generated, if energy is not lost otherwise (Take the value of gas\[10\,\,m{{s}^{-2}}\]).

    A) \[10\,\,W\]         

    B)        \[100\,\,W\]

    C) \[{{10}^{6}}W\]           

    D)        \[{{10}^{5}}W\]

    Correct Answer: C

    Solution :

    \[P.E.=mgh=100\times 10\times 100\] Power\[={{10}^{6}}W\]


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