Engineering Quiz
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 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.
via Eric
follow the jump for the answers:
July 27th, 2006 at 3:27 pm
ha ha
July 28th, 2006 at 5:29 am
Speed: 86.73 mph
Distance and Time: Distance traveled will be equal to the FPS (feet per second) that the mass (truck) travels during the time it takes the driver to hang up his cell phone.
July 28th, 2006 at 2:28 pm
hahahaha!!!