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MGIMS WARDHA MGIMS WARDHA Solved Paper-2010

  • question_answer
    A disc, initially at rest, starts rotating about its own axis, with a constant angular acceleration of 0.2 rad/s2.The time taken by the disc to rotate by 10 rad is (in second)

    A)  7.07                                      

    B)  10

    C)  14.14                                   

    D)  100

    Correct Answer: B

    Solution :

                     From the equation, \[\theta ={{\omega }_{0}}t+\frac{1}{2}\alpha {{t}^{2}}\] Given,\[\alpha =0.2\text{ }rad/{{s}^{2}},\text{ }{{\omega }_{0}}=0,\text{ }\theta =10\text{ }rad\] \[\Rightarrow \]               \[10=\frac{1}{2}(0.2){{t}^{2}}\] \[\Rightarrow \]               \[{{t}^{2}}=100\] \[\Rightarrow \]               \[t=10\,s\]


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