AMU Medical AMU Solved Paper-1999

  • question_answer
    A body is moved along a straight line by a machine which delivers constant power. The distance moved by the body in time\[t\]is proportional to

    A)  \[t\]

    B)  \[{{t}^{1/2}}\]

    C)  \[{{t}^{5/2}}\]

    D)  \[{{t}^{3/2}}\]

    Correct Answer: D

    Solution :

    : Power P = (force F)\[\times \](velocity v) \[P=m\times \] acceleration\[\times v\] or \[P=ma\times (at)\Rightarrow {{a}^{2}}=\frac{p}{m\times t}\] Now\[S=\frac{1}{2}a{{t}^{2}}\] \[=\frac{1}{2}\times \sqrt{\frac{P}{mt}}.{{t}^{2}}=\frac{1}{2}\times \sqrt{\frac{P}{m}}.{{t}^{3/2}}\] S = (constant) \[\times {{t}^{3/2}}\] or Distance\[(S)\propto {{t}^{3/2}}\]


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