question_answer

A weight w is suspended from the mid-point of a rope, whose ends are at the same level. In order to make the rope perfectly horizontal, the force applied to each of its ends must be

A)  less than w      

B)  equal to w

C)  equal to 2w      

D)  infinitely large

Correct Answer: D

Solution :

                For equilibrium of body \[10m/s\]                 \[7m/s\]              \[12m/s\] For the string to be horizontal,                                 \[\frac{2v(n-1)}{n}\] \[\frac{v(n-1)}{n}\]         \[\frac{v(n+1)}{n}\] \[\frac{2v(n+1)}{n}\]      \[F=q(v\times B)\]