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11.52:
a) Finding torques about the hinge, and using
L
as the length of the bridge and
and
B
T
w
w
for the weights of the truck and the raised section of the bridge,
(
29
(
29
°
+
°
=
°
30
cos
L
30
cos
70
sin
2
1
B
4
3
T
w
L
w
TL
,
so
(
29
N.
10
57
.
2

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**Unformatted text preview: **70 sin 30 cos ) s m 80 . 9 ( 5 2 B 2 1 T 4 3 × = ° ° + = m m T b) Horizontal: ( 29 N. 10 97 1 30 70 cos 5 × = °-° . T Vertical: °-+ 40 sin B T T w w N. 10 2.46 5 × =...

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