Dawg Posted January 22, 2009 Report Share Posted January 22, 2009 (edited) A backhoe weighing 8 tons is on top of a flatbed 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 criss-cross 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 braking by the driver... Extra Credit: Solve for time and distance required for the entire rig to come to a complete stop after hitting the overpass at the speed calculated above? * * * * * * * * * I couldn't solve it either, but who cares.....the pics are GREAT!!!!! Edited January 22, 2009 by Dawg Quote Link to comment Share on other sites More sharing options...
Guest shorty785 Posted January 22, 2009 Report Share Posted January 22, 2009 dang it mine man my head hurts now lol those are nice pics though Quote Link to comment Share on other sites More sharing options...
OJR Posted January 22, 2009 Report Share Posted January 22, 2009 The only thing I can think of is that was a very sudden deceleration! Dang! Quote Link to comment Share on other sites More sharing options...
Bowtech_archer07 Posted January 22, 2009 Report Share Posted January 22, 2009 WOW that is crazy.... good pics though!! Quote Link to comment Share on other sites More sharing options...
Shaun_300 Posted January 22, 2009 Report Share Posted January 22, 2009 Wow! Imagine if there was a car going over the overpass when that sucker hit?! :eek: Quote Link to comment Share on other sites More sharing options...
wtnhunt Posted January 22, 2009 Report Share Posted January 22, 2009 That trackhoe pic has been floating around for a couple years. Pretty costly mistake in judgement for someone for sure. Quote Link to comment Share on other sites More sharing options...
Heavy Metal Posted January 22, 2009 Report Share Posted January 22, 2009 I went to art school. Quote Link to comment Share on other sites More sharing options...
cinch314 Posted January 22, 2009 Report Share Posted January 22, 2009 37.8 seconds give or take a few seconds. Quote Link to comment Share on other sites More sharing options...
Texan_Til_I_Die Posted January 22, 2009 Report Share Posted January 22, 2009 That's why you're supposed to haul those things disassembled! Quote Link to comment Share on other sites More sharing options...
PotashRLS Posted January 22, 2009 Report Share Posted January 22, 2009 I come up with 261 mph and .885071 seconds to stop. Distance obviously is the width of the bridge.......duh:rolleyes: So from my calculations, the driver of the truck will get a speeding ticket:D, the engineers working for the manufacturer of the excavator will get some big raises $$$, and the guys who built the overpass will get their _sses jacked. Quote Link to comment Share on other sites More sharing options...
clrj3514 Posted January 22, 2009 Report Share Posted January 22, 2009 Wow! Imagine if there was a car going over the overpass when that sucker hit?! :eek: thats what i was thinkin too :eek: Quote Link to comment Share on other sites More sharing options...
Ladybird Posted January 22, 2009 Report Share Posted January 22, 2009 wow that is crazy:eek: Quote Link to comment Share on other sites More sharing options...
layin on the smackdown Posted January 22, 2009 Report Share Posted January 22, 2009 you guys got way to technical with this one....its cave man mathematics......square peg round hole...it just doesnt fit...lol:D unbelievable Quote Link to comment Share on other sites More sharing options...
stevebeilgard Posted January 23, 2009 Report Share Posted January 23, 2009 wow. he almost made it. it's about 3/4 through. nice job, overall. that couldn't have cost over a couple million.... Quote Link to comment Share on other sites More sharing options...
buckee Posted January 23, 2009 Report Share Posted January 23, 2009 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 braking by the driver... Based on the distance it has sliced through the bridge thus far, according to my calculations, the Flatbed would have to be going exactly 2.37 times faster than it's previous speed to slice all the way through the bridge. :D:D:confused: I would have hated to be the driver going past up top, at the time. Quote Link to comment Share on other sites More sharing options...
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