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AMU Medical AMU Solved Paper-1997

  • question_answer
    A man mass 60 kg records his weight on a weighing machine placed inside a lift. The ratio of the weights of the man recorded when the lift is ascending up with a uniform speed of \[2\text{ }m{{s}^{-1}}\]to when it is descending down with a uniform speed of\[\text{4 }m{{s}^{-1}}\]will be

    A)  0.5               

    B)  \[-1\]

    C)  2                 

    D)  none of the above

    Correct Answer: B

    Solution :

    : While ascending, apparent weight \[=m(g+a)\] \[\therefore \]\[{{W}_{1}}=m(g+a)=m(g+0)\] \[\therefore \]\[{{W}_{1}}=mg\] While descending, \[=m(g-a)\] \[=m(g-0)=mg\] since acceleration is zero. \[\therefore \]\[{{W}_{1}}={{W}_{2}}=mg=\]Lift rises or descends with zero acceleration. Ratio\[\frac{{{W}_{1}}}{{{W}_{2}}}=1\]


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