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September 08, 2006

Engineering quiz

Lou sends this test of what you remember from strength-of-materials class.

A backhoe weighing 8.1 tons is on top of a flatbed trailer heading east on Interstate 70 near Hays, Kansas. The extended shovel arm is made of hardened 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.

The truck is traveling at 75 MPH. The bridge is stationary. The ambient temperature is 95° F and there is an easterly wind at 12 knots. Assume no braking by the truck driver.

How far into the bridge will the backhoe travel?

Backhoe-Bridge-1.jpg

Backhoe-Bridge-2.jpg

Backhoe-Bridge-3.jpg

Posted by joke du jour at September 8, 2006 06:03 PM

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