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Railways NTPC (Technical Ability) Engineering Mechanics and Strength of Materials Question Bank Engineering Mechanics

  • question_answer
        A car of mass 2000 kg is traveling at a constant speed of 50 m/s. The car has to resist a wind drag \[{{F}_{D}}=10v(N),\] Where v is the velocity of the car in m/s. The power required by the engine is:      

    A) 5 kW                

    B) 10 kW          

    C) 25 kW              

    D) 30 kW          

    Correct Answer: C

    Solution :

    Wind drag, \[F=10v=10\times 50=500\,\,N\] Power required \[=\frac{Fv}{{{10}^{3}}}=\frac{500\times 50}{{{10}^{3}}}=25\,\,kW\]


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