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NEET Sample Paper NEET Sample Test Paper-44

  • question_answer
    A bread gives a boy of mass 40kg an energy of 21kJ. If the efficiency is 28%, then the height that can be climbed by him using this energy, is:

    A) 22.5m                          

    B) 15m   

    C) 10m                 

    D) 5m

    Correct Answer: B

    Solution :

    General expression for gravitational potential \[\operatorname{V}=\frac{-GM}{x}\] Where x = distance from centre of earth \[\operatorname{V}=\frac{-GM}{{{\left( \operatorname{R}+h \right)}^{2}}}=-5.4\times {{10}^{7}}\]     ?(1) negative sign for attractive force \[{{g}_{surface}}=\frac{GM}{{{\left( \operatorname{R}+h \right)}^{2}}}=6\]                 ?(2) By (1) and (2) 9000km = R + h 9000km = 6400km + h h= 2600km


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