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Site News Could You Have Stopped This? Vegas Shooting Analysis with Attorneys on Retainer
1/20/2011 5:27:25 PM EDT
Math Question:

A Backhoe weighing 8 tons is on top of a flatbed trailer and heading east on Interstate 70 near Hays, Kansas..

The
extended shovel arm is made of hardened refined steel and the
approaching overpass is made of commercial-grade concrete, reinforced
with 1 1/2 inch steel rebar spaced at 6 inch intervals in a criss-cross
pattern layered at 1 foot vertical spacing.

Solve: When the shovel
arm hits the overpass, how fast do you have to be going to slice the
bridge in half? (Assume no effect for headwind and no braking by the
driver...)

Extra Credit: Solve for t he time and distance

required for the entire rig to come to a complete stop after hitting the overpass at the speed calculated above?

Yes, you can neglect friction.
1/20/2011 5:28:49 PM EDT
[#1]
87mph.
1/20/2011 5:30:27 PM EDT
[#2]
I'm sure that will buff right out.

1/20/2011 5:31:52 PM EDT
[#3]
Dammit, I thought there was going to be video of it.

1/20/2011 5:32:19 PM EDT
[#4]
The counterweight weighs almost 8 tons.  Try more like 45 tons for the "excavator".
1/20/2011 5:33:51 PM EDT
[#5]
8 tons my arse, that baby weighed a whole lot more then that.
1/20/2011 5:37:01 PM EDT
[#6]
I saw the same thing happen here.

Dude forgot to fold up the boom, and drug the utility lines down for about 2.5 miles. He had, no shit, 4 tons of wire dragging from the excavator when he finally stopped.
1/20/2011 5:39:08 PM EDT
[#7]
Assuming an ambient temp of approximately 70* and a moisture content of less than 5% in the structure the speed necessary would be around 67.5 mph
The time to a complete stop would be somewhere in the middle OH and ShIIIITTTTTT
1/20/2011 5:50:44 PM EDT
[#8]
Insurance?  See, that was no ordinary load.  Permit required for oversize and overweight.



Single span box beam overpass.  BIG bucks.  Well over a million dollars in damage.
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