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The minimum force required to start pushing a body up a rough (frictional coefficient ) inclined plane is F_(1) while the minimum force needed to prevent it from sliding down is F_(2) if the inclined plane makes an anglethetawith the horizontal such that theta = 2mu then the ratio F_(1)//F_(2) is : |
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Answer» 1 and `F_(2) = mg sin theta-mu mg cos theta` `:.(F_(1))/(F_(2))=(sin theta+mucos theta)/(sin theta-mu cos theta)=(tan theta+mu)/(tan theta- mu)`=`(2mu+mu)/(2mu-mu)=(3mu)/(mu)=3` Thus, (C) is the correct choice 
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