A backhoe weighing 8 tons is on top of a flatbed trailer 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 with 1-foot vertical spacing.
Solve:
When the shovel arm hits the overpass, how fast does the trailer
with the backhoe have to be going to slice the overpass in half? (Assume
no headwind and no braking by the driver, who is oblivious of the
situation...)
Answer:It doesnt really matter.
The point is the trucking company just bought themselves an overpass
Jaimz