Tied arch bridges

Tied arch bridges have an arch-shaped superstructure, but differ from conventional arch bridges. Instead of transferring the weight of the bridge and traffic loads into thrust forces into the abutments, the ends of the arches are restrained by tension in the bottom chord of the structure. They are also called bowstring arches

                                               

                                                                  Suspension bridges

Suspension bridges are suspended from cables. The earliest suspension bridges were made of ropes or vines covered with pieces of bamboo. In modern bridges, the cables hang from towers that are attached to caissons or cofferdams. The caissons or cofferdams are implanted deep into the floor of a lake or river.


                                            

                                            

.                                                               Truss bridges

A truss bridge is a bridge whose load-bearing superstructure is composed of a truss. This truss is a structure of connected elements forming triangular unit.

                                    

•   Arch bridge  These bridges uses arch as a main structural component (arch is always located below the bridge, never above it). They are made with one or more hinges, depending of what kind of load and stress forces they must endure. Examples of arch bridge are “Old Bridge” in Mostar, Bosnia and Herzegovina and The Hell Gate Bridge in New York.

                                         

modern day canoes are made up of wood like this one


                         

she  engired  different  noises . it aloud her to sing on stage and makes different piches . i think it should only be used for music only and no i think my favorite artists should no use these gloves.

the screech owls house has to be 9-12 feet from the ground and its preferred  habitat is woodlands

 types of saws,1 hacksaw its a saw that has a sharp tooth blade that cuts threw wood plastic metal , 2 crosscut saw this is a saw that cuts sideways and it cuts stuff like trees , 3 chopping saw this is a saw thats thin and it shapes wood , 3 plywood and veneer saw this saw is a smaller and more precise with cutting

http://www.cbsnews.com/news/grounded-costa-concordia-cruise-ship-is-ready-to-roll-literally/

                                               

1.the airplane travels 12.5 feet

2.the airplane traveled in a straight line

3.i noticed that the plane kept hitting the wall

3.

                             1.the bernoulli's principles are when fluid increases the pressure decreases or a     decrese in the fluid's potential energy.                                                                                                                            2.go to youtube and type in how to make a good airplane and their you go.