Laws of MotionHard
Question
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 mid point which now no longer remains horizontal. The minimum tension required to completely straighten the rope is :
Options
A.15 kg
B.15/2 kg
C.2 kg
D.Infinitely large (or not possible)
Solution
T cosθ + T cosθ − 150 = 0 [Equilibrium of point A]
2 T cosθ = 150 T =
When string become straight θ becomes 90o
⇒ T = ∞
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