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At the equilibrium position we must have that
the tension S
is equal, but opposite, to
the weight W
of the mass.
Otherwise, there would be no equilibrium.
If nothing disturbs the pendulum when it is in equilibrium,
it would for ever remain in that position.
Note that the tension force
of the string is a reaction force,
not an intrinsic force of the string.
The string just reacts to the weight of the mass suspended from it.
For a different mass, the tension force would be different.
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