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9th Class Science Work and energy Question Bank Work Power and Energy IIT JEE Objective Problems

  • question_answer
    An electric motor exerts a force of 40 N on a cable and pulls its distance of 30 m in one minute. The power supplied by motor in watt is

    A)  20    

    B)  200

    C)  2                                            

    D)  10

    Correct Answer: A

    Solution :

      Given, \[F=40\,\,N\,\,S=30\,m\,\,t=1\,\,\min =60\,s\,P=?\] We know, \[P=\frac{F\times S}{t}\Rightarrow P=\frac{40\times 30}{60}=20W\]                                 


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