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

  • question_answer
    A force applied by an engine of a train of mass \[2.05\times {{10}^{6}}kg\] changes its velocity from \[5m/s\] to 25\[m/s\] in \[5\] minutes. The power of the engine is [EAMCET 2001]

    A)             \[1.025MW\]

    B)               \[2.05MW\]

    C)             \[5MW\]          

    D)             \[6MW\]

    Correct Answer: B

    Solution :

                Power\[=\frac{\text{Work done}}{\text{time}}=\frac{\frac{1}{2}m({{v}^{2}}-{{u}^{2}})}{t}\]             P\[=\frac{1}{2}\times \frac{2.05\times {{10}^{6}}\times [{{(25)}^{2}}-({{5}^{2}})]}{5\times 60}\]             \[P=2.05\times {{10}^{6}}\,W=2.05\,MW\]


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