Two persons are holding a rope of negligible weight tightly at its ends so that it is horizontal. A 15 kg weight is attached to the rope at the midpoint which now no longer remains horizontal. The minimum tension required to completely straighten the rope is:
A
15 kg
B
kg
C
5 kg
D
infinitely large
Text Solution
Verified by ExpertsThe correct answer is:
D
T cos θ + T cos θ – 150 = 0 [Equilibrium of point A]
2 T cos θ = 150 T = 
When string become straight θ becomes 90º
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