Quote:
Originally Posted by SleazyDream
An 18-wheeler is crossing a 4 kilometer bridge that can only support 10,000 kilograms and that's exactly how much the rig weighs. Halfway across the bridge a 30 gram sparrow lands on the cab, but the bridge doesn't collapse. Why not?
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This one IS for smart people, because you have to be pretty clever to understand that the effect of gravity in the middle of a bridge is slightly less than the effect on the ground due to the earth's proximity to the bridge's span at the center.