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JEE Main & Advanced Physics Work, Energy, Power & Collision / कार्य, ऊर्जा और शक्ति Question Bank Conservation of Energy and Momentum

  • question_answer
    If the water falls from a dam into a turbine wheel 19.6 m below, then the velocity of water at the turbine is \[(g=9.8\,m/{{s}^{2}})\]                                                [AIIMS 1998]

    A)                 9.8 m/s

    B)                    19.6 m/s

    C)                 39.2 m/s

    D)                    98.0 m/s

    Correct Answer: B

    Solution :

                        Potential energy of water = kinetic energy at turbine                 \[mgh=\frac{1}{2}m{{v}^{2}}\]Þ\[v=\sqrt{2gh}=\sqrt{2\times 9.8\times 19.6}=19.6\,m/s\]


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