Engineering Problem: (2nd year 2nd semester)
Conditions:
A backhoe weighing 22 tons is on top of a lowboy 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 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 the time and distance Required for the entire rig to come to a complete stop
after hitting the overpass at the speed calculated above. Yes, you can neglect friction
I couldn’t solve it either…but who cares; the pictures are great!
P.S. The driver was on his cell phone…
yorkyjoy:
Engineering Problem: (2nd year 2nd semester)
Conditions:
A backhoe weighing 22 tons is on top of a lowboy 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 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 the time and distance Required for the entire rig to come to a complete stop
after hitting the overpass at the speed calculated above. Yes, you can neglect friction
I couldn’t solve it either…but who cares; the pictures are great!
P.S. The driver was on his cell phone…
Surprisingly slowly.Think of those zb great big thick RSJ/I beams that made up the load bearing outer structures of the World Trade Centre towers and how the much weaker fuselage and wings of a relatively light small airliner went through them like a knife through butter.
