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

  • question_answer
    If in a stationary lift, a man is standing with a bucket full of water, having a hole at its bottom. The rate of flow of water through this hole is \[{{R}_{0}}.\] If the lift starts to move up and down with same acceleration and then that rates of flow of water are \[{{R}_{u}}\] and \[{{R}_{d}},\] then                                   [UPSEAT 2003]

    A)             \[{{R}_{0}}>{{R}_{u}}>{{R}_{d}}\]     

    B)           \[{{R}_{u}}>{{R}_{0}}>{{R}_{d}}\]

    C)             \[{{R}_{d}}>{{R}_{0}}>{{R}_{u}}\]

    D)               \[{{R}_{u}}>{{R}_{d}}>{{R}_{0}}\]

    Correct Answer: B

    Solution :

                    Rate of flow will be more when lift will move in upward direction with some acceleration because the net downward pull will be more and vice-versa.             \[{{F}_{\text{upward}}}=m\,(g+a)\] and \[{{F}_{\text{downward}}}=m\,(g-a)\]


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