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1000 Ib
200 Ib/f
25'
50
Force?
Force?
Figure 1
Suppose one truck is parked on a bridge as shown in Figure below. The truck weighs
1000 lb which is acting through its center of gravity (CG). The bridge weighs 200 Ibs per feet,
which is uniformly distributed. We can assume the bridge is rigid. We want to know what will be
the reaction forces at the supports of bridge at the two ends.

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