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A block slides from an inclined plane of inclination 45^(@)If it takes twice the time with friction than that without friction, the coefficient of friction between block and surface is : |
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Answer» 1 Acc. with friction `a_(2) = g sin theta- mug COS theta` Now `(t_(1))/(t_(2))=sqrt(a_(2)/(a_(1))) or(t_(2))/(t_(1))=sqrt(a_(1)/(a_(2)))` `2=sqrt((gsintheta)/(gsin theta- mug cos theta))` `4=(sin theta)/(sin theta-mu cos theta)=(1)/(1-mu tan theta)` `4=(1)/(1-mu)=1 or(As theta=45^(@)` `4-4mu=1 or 4mu=3mu=3//4=0.75` (b) is the choice. |
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