Got this in an e-mail from a frend, Dwan A Backhoe weighing 8 tons is on top of a flatbed trailer and heading east on Interstate 70 near Hays, Kansas. Its 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 at 1 foot vertical (depth) spacings. Solve: If the shovel arm hits the overpass, how fast would it have to be going to slice the overpass completely in half? (Assume no effect for headwind and no breaking by the driver...) ...its pure physics: F=MA 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. (yeah, I know there isn't nearly enough data to solve this, but if we had details and this example was used as an imperial test, we might get close to an answer to the writer's supposition. ..Jim)
Looks like a 290, weighs just a little bit more than 8 ton.
Need the coefficient of friction between the tracks and the low loader deck, as well as the true sectional modulus of the concrete overpass...plus what MPA the concrete is, mass of the truck, details of any tie downs, speed of the rig ummm....Just at a rough guess...I'd say that it would cut a bit more than halfway through This pic sure does get around.
I think the real question is: 'I wonder who will hire me now?'
was the boom raised haha!! and i wander what the reasoning behind disconecting the gooseneck was haha!! the machin has some good compact radius arm height haaha!!! waunder why was that machine on backwards!?!?!?!?!