November 14, 2010

Engineering Question


A backhoe 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, reinforced with 1 inch steel rebar spaced at 6 inch intervals in a criss-cross 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 pictures are great!

P.S. The driver was on his cell phone...............

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