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Thursday, February 26, 2009

Engineering Math Question


A trackhoe weighing 22 tons is on top of a lowboy 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, re inforced with 1½ inch steel rebar spaced at 6 inch intervals in a crisscross pattern layered at 1 foot vertical spacing.


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 the 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.

I couldn't solve it either......but who cares;

The driver was on his cell phone.. ;p


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