Practical Engineering problem - help needed

[Rotty]

Practical Engineering problem:

Given: 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 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.

Extra Extra Credit: Calculate the impact in ft. lbs. of the truck driver without a seat Belt as his head hits the windshield going from 70 mph to 0 mph in 60 ft.

Even More Extra Credit: Calculate, in decibels, the volume of the screams From the Insurance Claim Representative when he realizes that this is HIS customer.

 

[spike's]

fork

 

[JRS]

Good Lord....

Did a number on that didn't it?

 

[Borris]

!eoh ,eoh ,eoH

 

[SideWinder]

Do you actually have the answers to the questions or are you just making the post better than a few pictures?

 

[Rotty]

Do you actually have the answers to the questions or are you just making the post better than a few pictures?

sorry , no answers

 

[Tru]

Haha, oh ****!

 

[Werewolf]

A bit of polyfiller and a lick of paint and it'll look as good as new.

 

[Rotty]

A bit of polyfiller and a lick of paint and it'll look as good as new.

you know my decorator ?

 

[danza]

Bridges-they don't make 'em like they used to.

 

[Werewolf]

you know my decorator ?

I trained him

I hope you didn't touch that load bearing poster

 

[ichabod crane]

pretty skilled i say, he didnt even break the guard rail on the bridge

 

[AJUK]

Nice!

I probably could work it out (I am a chartered structural engineer) but without the details of the bridge and some more info on the excavator there would be too many unknown variables. I can confidently predict that it is possible for a backhoe to seriously pwn a bridge though.

 

[nutcase]

A bit of polyfiller and a lick of paint and it'll look as good as new.

Yeah, but what about the bridge

Impressive Must have been strong tiedowns to the trailer.

 

[Jonny69]

That'll teach me to not scroll down. I was about to try and work you out an answer

 

[Bill101]

pretty skilled i say, he didnt even break the guard rail on the bridge

I noticed that as well, it also looks like it has gone all the *** through the road surface and then reversed back on it's self

 

[WillyNelson]

Can only imagine the WTF moment the driver had when that hit!

 

[Tru]

I noticed that as well, it also looks like it has gone all the *** through the road surface and then reversed back on it's self

Took me a while to work it out but it looks like the arm was pointing the other way, just caught the underside of the bridge and the force has caused it to rear up and through the fly over, with the bucket connecting with the other side (pic 2).