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

  • question_answer
    An electric motor creates a tension of 4500 newton in a hoisting cable and reels it in at the rate of 2 m/sec. What is the power of electric motor                           [MNR 1984]

    A)             15 kW

    B)               9 kW             P = Fv \[=4500\times 2=9000\,W=9\,kW\]

    C)             225 W

    D)               9000 HP

    Correct Answer: D

    Solution :

                P\[=\frac{\text{Workdone}}{\text{Time}}\]= \[\frac{mgh}{t}\]\[=\frac{300\times 9.8\times 2}{3}=1960\,W\]


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