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Q.

Two identical blocks A and B each of weight 20 N 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 block B is :

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a

12 N

b

16 N

c

32 N

d

36 N

answer is A.

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Detailed Solution

Tcos⁡53∘=F and  T=20⇒20×35=F⇒F=12N
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