First slide

Constraints

Question

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 :

Easy

A

12 N
B

16 N
C

32 N
D

36 N

Solution

$\begin{array}{l} Tcos 53^{\circ} = F and T = 20 \\ \Rightarrow 20 \times \frac{3}{5} = F \Rightarrow F = 12 N \end{array}$

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