JEE Main & Advanced Physics NLM, Friction, Circular Motion Question Bank Third Law of Motion

  • question_answer
    A body floats in a liquid contained in a beaker. If the whole system as shown in figure falls freely under gravity, then the upthrust on the body due to liquid is  [Manipal MEE 1995]               

    A) Zero            

    B) Equal to the weight of liquid displaced            

    C) Equal to the weight of the body in air            

    D) None of these

    Correct Answer: A

    Solution :

        Up thrust on the body \[=v\sigma \ g\]. For freely falling body effective g becomes zero. So up thrust becomes zero          


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