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

  • question_answer
    An engine develops 10 kW of power. How much time will it take to lift a mass of 200 kg to a height of 40 m. \[(g=10\,m/{{\sec }^{2}})\]                    [CPMT 1992]

    A)             4 sec   

    B)             5 sec

    C)             8 sec   

    D)             10 sec

    Correct Answer: C

    Solution :

                \[P=\frac{mgh}{t}=10\times {{10}^{3}}\]Þ \[t=\frac{200\times 40\times 10}{10\times {{10}^{3}}}\]\[=8\,\sec \]


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