A flexible chain of mass 
hangs between two fixed points at the same level. The inclination of the chain with the horizontal at the two points of support is 
. Considering the equilibrium of each half of the chain, the tension of the chain at the lowest point is 
。
Text Solution
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A chain of mass 
hangs between two fixed points at the same level with inclination 
at support points.
Consider equilibrium of one half of the chain (mass 
):
Horizontal equilibrium: 
Vertical equilibrium: 
From vertical equation: 
, giving 
Substituting into horizontal equation: 
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