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77. Since
GA
exerts a leftward force
T
at the corner
A
, then (by equilibrium of horizontal
forces at that point) the force
F
diag
in
CA
must be pulling with magnitude
diag
2.
sin 45
T
FT
==
°
This analysis applies equally well to the force in
DB
. And these diagonal bars are pulling
on the bottom horizontal bar exactly as they do to the top bar, so the bottom bar
CD
is the
“mirror image” of the top one (it is also under tension
T
). Since the figure is symmetrical
(except for the presence of the turnbuckle) under 90° rotations, we conclude that the side
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 Spring '08
 Any
 Physics, Force

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