1.

Two identical blocks `A` and `B` each of weight `20N` are placed on a frictionless horizontal plane. The portion of the string connected to `B` is vertical and that connected to `A` makes an angle of `53^(@)` with the plane . The minimum horizontal force `F` required to lift the blocks `B` is A. `12N`B. `16N`C. `32N`D. `36N`

Answer» Correct Answer - A
Ans. (1)
`Tcos53^(@)=F` & `T=20`
`rArr20xx(3)/(5)=FrArrF=12N`


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