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In the adjacent figure blocks A and B of weight W each are lying at rest on a rough horizontal surface. They are pulled by applying forces `F_(1)` and `F_(2)` as shown in figure. When blocks are in limiting equilibrium `F_(2)=5F_(1)` Choose the correct statement (s) (Assume same coefficient of friction for both the blocks)A. The value of frictional force on the block `B` is equal to five time value of frictional force on `A`B. The coefficient of friction is equal to `8//9`C. The ratio of `F_(1)` to the weight of the block `W` (i.e. `F_(1)//W`) is equal to `2//3`D. The value of friction forces on the block are equal. |
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Answer» Correct Answer - A::B::C::D For block `A` `F_(1)cos37^(@)=muN_(1)`………1 `N_(1)=W-F_(1)sin37^(@)`………2 For block `B` `5F_(1)cos37^(@)=muN_(2)`……..3 `N_(2)=W+5F_(1)sin37^(@)`………..4 From 1 & 2 `(4F_(1))/5+muxx(3F_(1))/5=muW` From 3 & 4 `4F_(1)-mu3F_(1)=muW` On solving `mu=8/9` and `(F_(1))/W=2/3` |
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