A weight w is suspended from the midpoint 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

Options

A. less than w
B. equal to w
C. equal to 2w
D. infinitely large

Answer

D

Explanation

(d) for equilibrium of body,
`mg = 2T cos theta implies T=(mg)/(2 cos theta)`

For the string to be horizontal, ` theta =90^(@)`
`therefore T=(mg)/(2 cos 90^(@)) implies T=oo`