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Math challenge with pics

Published:

Came in email .... utterly amazing.


Challenge yourself here:

A Backhoe weighing 8 tons is on top of a flat-bed 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 crisscross 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 breaking 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.

Answer - Who cares, the trucking company just bought themselves a
bridge. Check out these incredible pictures.
Entry #403

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