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57
SSM
REASONING
There are four forces that act on the chandelier;
they are
the forces of tension
T
in each of the three wires,
and the downward force of gravity
m
g.
Under the influence of these forces, the chandelier is at rest and, therefore, in equilibrium.
Consequently, the sum of the
x
components as well as the sum of the
y
components
of
the forces must each be zero.
The figure below shows the freebody diagram for the
chandelier and the force components for a suitable system of
x
,
y
axes.
Note that the
freebody diagram only shows one of the forces of tension; the second and third tension
forces are not shown.
The triangle at the right shows the geometry of one of the cords,
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 Spring '08
 SOFFER

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