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JEE Main & Advanced Physics Work, Energy, Power & Collision / कार्य, ऊर्जा और शक्ति Question Bank Self Evaluation Test - Work, Energy and Power

  • question_answer
    A 10 m long iron chain of linear mass density \[0.8 kg {{m}^{-1}}\] is hanging freely from a rigid support. If\[\operatorname{g}~=10 m{{s}^{-2}}\], then the power required to left the chain up to the point of support in 10 second

    A) 10 W

    B) 20 W

    C) 30 W

    D) 40 W

    Correct Answer: D

    Solution :

    [d] \[\operatorname{m}=10\times  0.8kg = 8kg\] Height of iron chain \[=5m\] \[\operatorname{P}=\frac{mgh}{t}=\frac{8\times 10\times 5}{10}W=40w\]


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