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

  • question_answer
    Electric lift is moving downwards with an acceleration of g/3 the vertical force between a passenger in the lift and its floor is equal to:

    A) 2/3rd of the passenger's weight

    B) 3/4th of the passenger's weight

    C) Passenger's weight

    D) 4/3 times the passenger's weight

    Correct Answer: A

    Solution :

    \[a=\frac{g}{3}\] \[T=W\left( 1-\frac{a}{g} \right)=W\left( 1-\frac{1}{3} \right)=\frac{2}{3}W\]


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