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Bridges and Tunnels
A bridge is a link between two places, such as over a river, a road or a depression, that caters to pedestrians and/or vehicles. A tunnel is an underground link between two places, often underneath a riverbed, for pedestrians and/or vehicles.
4,393 Questions
Is there a good example of a cantilever bridge in south Africa?
Quebec Bridge
Forth Bridge
Minato Bridge
How do you make a strong electromagnet?
Electromagnets are made by wrapping wire around a conductive rod, so that an electromagnetic field is created when current is passed through the wire.
CAUTION : Do not use 110-120 volt AC power in any science experiments. This represents a dangerous electrical shock hazard. Use low-voltage DC wherever possible.
To make a simple electromagnet ,you can wrap 50 or 100 turns of thin insulated copper wire along the length of an iron nail, forming a neat coil of wire tight along and around the nail. (Leave about 9 inches of wire free at each end of the coil to attach to the power source.)
1. Wrap the insulated wire around the nail, moving down the nail as you go.
2. Fix the coil of wire in place with some sticky tape.
3. Clean off the insulation at the ends of the extra wire, for about 1 inch, exposing the shiny metal inside.
4. Bend the ends into loops and connect to a LOW VOLTAGE direct-current power supply, such as a model train transformer or a D-cell battery pack.
When you hold each end of the coil to the terminals of the power supply, it will send an electric current into the coil around the nail. The current will make the nail magnetic. You should then be able to pick up other nails with your electromagnet. (Doing this for just a few minutes will use up all the electric charge stored inside a battery and it will go dead.)
Experiment by using more or less turns of wire to make the coil around the nail bigger or smaller. The more coils you wrap around the nail the stronger the magnet will get. The larger the voltage of the power source you use, the stronger your electromagnet will get. But don't use more than 15 volts -- it is dangerous because the wire could catch fire or you could receive an electric shock.
Another answer
Making an electromagnet is really quite simple. First you get some wire (22-18 gauge should do just fine). The wire must be insulated. Next, take an iron nail and coil all of the wire around the nail except a small bit on the ends. Strip off the insulation to connect to your power supply. Hook the ends up to some batteries, and presto -- you have a fancy little electromagnet.
Another answer
To make an electromagnet, take an iron rod (fairly small). You'll also need some wire, stripped at the ends. You should then wrap the wire into a coil around the iron rod. The more coils, the stronger the magnet. The two wires should be connected to your power source (a proper scientific powerpack- so you don't electrocute yourself). Turn on the power, then see if it will attract paperclips and other small iron and steel objects.
What two provinces does Confederation Bridge connect?
The Confederation bridge in Canada connects the provinces of New Brunswick and Prince Edward Island.
If something is neoclassical, it is referencing classical art. Classical art is best visualized by looking at ancient Rome: tall columns, weighty arches, nude statues. Neoclassical art is made after the fall of the Roman empire but was inspired by it.
What 2 countries does the eurotunnel connect?
Great Britain and France
Eurotunnel is the name of the company which owns and operates the Channel Tunnel, as well as other business interests.
The Channel Tunnel connects the United Kingdom and France. It runs between Folkestone in Kent and Sangatte near Calais in Pas-de-Calais.
Where is millau bridge in France?
Millau is a town and commune of southern France. It is located at where the Tarn and Dourbie rivers meet. map coordinates N44 05.07/ E03 01.18 unverifed
What is the name of the most famous arch bridge?
The Pont-Neuf (New Bridge) which is despite its name, the oldest bridge in Paris, and the Pont Alexandre III (opposite the Invalids) with its magnificent lamp posts are certainly among the most famous.
Who was the artist Lindberg who painted children on the bridge protected by the guardian angel?
The artist, H. Zabateri, originally painted children on a bridge with a guardian angel protecting them as a postcard. Lindberg is a printing company that offers reproductions of the print done by various artists that typically are not named.
Can you get the Eurotunnel from Folkestone to Disneyland Paris?
Eurotunnel is the name of the company which owns and operates the Channel Tunnel, as well as other business interests.
You have two options for travelling through the Channel Tunnel. You can take a high speed passenger train, or you can put your car one of the drive-on, drive-off vehicle transporting trains.
The Eurotunnel Shuttle is the brand name for the car carrying trains which run through the Channel Tunnel between Folkestone and Calais.
This is the option if you want to take your car. You then have to drive from Calais to Disneyland.
Eurostar is the brand name of the company running high speed trains London-Paris and London-Lille-Brussels through the Channel Tunnel.
Some of these trains stop at Ashford, not far from Folkestone. You can then take a train all the way to Disneyland, but you may need to change trains en route.
What is the worlds famous bridge in San Francisco called?
The San Francisco Golden Gate Bridge is a suspension bridge over the Golden Gate, which is a strait between San Francisco Bay and the Pacific Ocean. It connects the city with Marin County.
Access the related link below for a Virtual Tour:
The iron plow was invented in the Zhou Dynasty. The farmers back then, bought iron plows and hooked them on to the farmers horses. Then the farmers had the horses pull the plow and them. The iron plow was invented between 1000 and 1028 BC.
Why are arch bridges better than than beam bridges?
Arch bridges are better because they transfer the weight down the archs and into the grownd unlike the beam bridge where it transfers it's weight through the beams wich break more often than arch bridges. Arch bridges are better because they transfer the weight down the archs and into the grownd unlike the beam bridge where it transfers it's weight through the beams wich break more often than arch bridges.
How long does the eurotunnel take to get from dover to calais?
Eurostar trains do not go via Dover, the nearest stop is Ashford. But only a few trains stop at Ashford, most go non-stop from London to Paris.
Eurostar is the brand name of the company running high speed trains London-Paris and London-Lille-Brussels through the Channel Tunnel.
Eurostar uses the stations: St. Pancras (London), Gare du Nord (Paris), Bruxelles Midi (Brussels) and Lille Europe.
Currently these are the only passenger trains operating through the tunnel.
The Eurostar takes 2 hours 15 minutes between London and Paris.
What are the different functions of bridges?
Some bridges are for walking or riding a bicycle on (known as footbridges)
Larger bridges usually will accommodate automobiles (including trucks)
Some of these bridges may join highways to major streets or to other highways (called overpasses)
Long bridges that span over waterways may lift to allow a boat to pass underneath them.
Some bridges are simply meant to be admired and serve no function otherwise.
Another type of bridge is used for networking. It is usually referred to as a wireless bridge.
Wireless bridges are used to boost the range of an existing network.
Can you bridge an 8 ohm speaker to 4 ohms?
Ohms is a measure of resistance. When the electricity passes into the speaker, some of it is 'resisted.' The ohms rating of the speaker is how much is resisted, and an indication of how much energy it takes to drive it - the higher the ohms rating, the more difficult it is to drive.
What year did the Auckland harbor Bridge open?
It opened on May 30, 1959. Which was in the 20th Century, it was originally used to transport trucks.
Who designed the brooklin bridge?
John Augustus Roebling designed the Brooklyn Bridge, but his son Washington A. Roebling completed the building portion
What materials were used to construct the Roman Bridge At Alcantara?
sand and bamboo with some dirt and flowers to make it look pretty and chicken bones (sometimes mistaken as rooster bones) were used, Little pepit was the creator of the bridge. Years later, asian people destroyed it, and threw the bridge at Little pepit house. Little pepit spirit now haunts the asian people, so to be safe, you must wear a cat over your head.
How much did Sydney Harbour Bridge cost to build?
Construction of the Sydney Harbour Bridge cost £4.2 million.
With regard to the cost to human life, sixteen lives were lost during its construction, while up to 800 families living in the path of the proposed Bridge path were relocated and their homes demolished when construction started.
What were drawbridges used for?
Originally drawbridges were the heavy wooden gates on castles that were surrounded by moats. The bridge was the only way to cross the moat, and they could be raised in the event of an attack, to prevent enemies from entering the castle.
The next great use was in the age of river trading, when large vessels had to travel upriver to ports. The drawbridge (technically called a bascule bridge) could be raised, either in whole or in two parts, only when necessary to allow tall ships to transit. Bascule bridges continue to be used for both traffic and railroads.
What are facts about the Sydney Harbour Bridge?
Length of arch span 503 metres
Height of top of arch 134 metres above mean sea level
Height to top of aircraft beacon 141 metres above mean sea level
Width of deck 49 metres
Clearance for shipping 49 metres
Height of pylons 89 metres above mean sea level
Base of each abutment tower 68 metres across and 48 metres long
(two pylons rest on each abutment tower)
Total length of bridge 1149 metres including approach spans
Bearing pins Each of the four pins measures 4.2 metres long
and 368 millimetres in diameter
Thrust on bearings Under maximum load approximately 20,000 tonnes
on each bearing
Number of rivets Approximately 6,000,000
Largest rivet Weighed 3.5 kilograms and was 395 millimetres long
Longest hanger 58.8 metres
Shortest hanger 7.3 metres
Total weight of steelwork 52,800 tonnes including arch and mild steel approach spans
Weight of arch 39,000 tonnes
Rock excavated for foundations 122,000 cubic metres
Concrete used for bridge 95,000 cubic metres
Granite facing used on pylons and piers 17,000 cubic metres
Allowance for deck expansion 420 millimetres
Allowance for arch expansion The arch may rise or fall 18 centimetres due to heating or cooling
Number of panels in arch 28, each 18.28 metres wide
Record tonnage erected 589 tonnes of steelwork was erected on the arch in one day on 26 November 1929
Paint required 272,000 litres of paint were required to give the Bridge its initial three coats
The Romans were first to fully appreciate the advantages of the arch and the vault. The arch has a strong load-bearing capacity and provides stability. The the simple barrel arch was occasionally used in the ancient Middle East and Pergamon invented the vault (adjacent arches which are assembled side by side) which has an even greater load bearing capacity and whose structure is also suited to support large roofs. With the Romans arches and the vaults came to be used extensively for the first time. They became essential for the construction of large scale buildings, to support large roofs and to build basements. The Romans also used the arch to build gates, aqueducts,
With arches much longer bridges could be built. These bridges could cross much wider rivers and wider and deeper valleys. The Romans even managed to build a bridge across the lower Danube, which is a very wide river. If a deep valley had to be crossed, two or three piers of arches were built on top of each other to reach the desired height.
The Pont du Gard, a bridge for an aqueduct which supplied Nimes, in southern France is the greatest example of a multi- pier bridge. It has three tiers of recessed arches with the main piers in line one above the other. The first two tiers have very high and wide arches and a third tier has low and narrow arches. It was built to carry an aqueduct to Nimes in southern France. It reaches a height of 48.8 metres (160 feet). The lower tier is 142 metres (466 feet) long and has six aches with a height of 22metres (72 ft.). The second tier is 242 metres (794 ft.) long and has eleven arches 20 metres (66 ft.) high. The upper tier is 275 metre (902 ft.) long. It originally had 47 arches (only 35 have survived) 7 metres (23 ft.) high. The width of the first pier is 6 metres (20th.), that of the second pier is 4 metres (13 ft.) and that of the third pier is 3 metres (23 ft).
Why did Harald Hadrada lose the battle of stamford bridge?
Harold Godwinson defeated Harald hardrada mainly because many of hardrada's men didn't have their armour as they were not expecting godwinsons arrival. also the vikings guarding the bridge were killed so hardradas men had no warning thus they didn't see them coming.
