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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
What bridge connects Queens to The Bronx?
Queens and The Bronx are connected by three bridges: The Bronx-Whitestone Bridge, the Throgs Neck Bridge, and the Triborough or Triboro Bridge, which is also called the Robert F. Kennedy or RFK Bridge.
The current (as of December 30, 2010) toll for cars on all three of these bridges is $6.50 cash (without E-ZPass) and $4.80 with E-ZPass.
What is the longest bridge in the UK?
The longest bridge in the UK as at 2006, is the Humber Estuary bridge, completed in 1981 at a length of 1,410 metres. At the time of construction, it was the longest bridge in the world, but is now the 4th longest in the world. The Humber Bridge is the longest bridge in the United Kingdom AS TAKEN BY THE LENGTH OF THE MAIN SPAN, and therefore the 4th longest in the world when using that criteria. The longest bridge in it's entirety is the Second Severn Crossing, which has a length of roughly 3.2 miles, over twice as long as the Humber Bridge.
Cracks in the rock got filled with water causing the expansion of the cracks. then rocks get broken off as it expands. The arch is formed only when all the rock is removed and stronger, harder rock is left over making the arch. Then (this will happen to the Green Bridge of Wales someday) as the arch gets bigger and biggger and bigger until the top of the arch collapses leaving something called a stack and then as the stack erodes leaving only a stump
How long does it take mail to arrive in Manhattan from Brooklyn?
First Class Mail is delivered in three to five days.
What side of the road do they drive on in the Chunnel?
The Channel tunnel has two separate tunnels for each way for trains onto which cars and trucks are loaded!
How do they drive in the service tunnel? See image under "Related links".
The building of the Mackinac Bridge began in May 1954 and opened to traffic November 1, 1957. A dedication was held in June 1958, with Governor G. Mennen Williams attending.
Who is the Holland Tunnel named after?
The Lincoln tunnel was one of many things named after Abraham Lincoln in New York
How many bridges are there over the river Seine in Paris?
In total, there are thirty-seven. The oldest is about 430 years old while the newest was constructed in the mid 1990s. For between $12-$15 American, visitors to Paris can take a cruise along the river that will take them past between twenty and twenty-three of the bridges. By the way, for those Sex and the City fans looking the bridge used in filming the final episode, it's the Pont Des Arts, which connects The Louvre to the Institut De France.
Why are there gaps is a road deck of a bridge?
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On older sections of bolted track the gaps were put in to allow for thermal expansion of the rails. On continuous welded rail the gaps are not intentional but the most likely result of removing a defect in the rail.
Gaps in the rails are most likely not intentional but a result of the steel warping or twisting from the weight and inertia of the constant train traffic. In older sections of track the wood ties that support the tracks my be decomposing causing gaps. Many railroads are upgrading to a continuous rail where they use thermite to weld the rails together at the seems, this improves the stability of the tracks and to improve the rail infrastructure.
How long in miles is the holland tunnel?
Depending on the tunnel (there are three), they are 1.4 - 1.5 miles long.
Where was the first bridge made?
The history of the first bridge built cannot be known. It was possibly by some nameless person in ancient times, perhaps using a fallen tree or limb to cross a stream.
It undoubtedly pre-dates any written or verbal record.
What state is the Verrazano-Narrows Bridge located in?
the American Bridge Co., a subsidiary of US Steel was responsible for at least part of the project. My late father was a superintendent on the bridge construction and got my brother a summer job stringing cables for the bridge sometime in the early 60's. Everyone in construction had a nickname then and they called him Ringo because he had longish hair!
What is the name of the bridge over the Thames?
There are 214 bridges which cross the river Thames so it would be difficult to name them all here. However, some of the best known bridges in London are Tower, London, Southwark, Lambeth, Vauxhall, Albert, Chelsea, Putney, Richmond, Kingston
How many cars go on the Millau Viaduct bridge daily?
Depends on the time of year really, in peak holiday months like August a peak was recorded of 53.795 in one day! but i should imagine quiter days are had.
How far from Marquette to mackinaw bridge?
The driving distance between Madison, WI and Mackinac Island, MI is approximately 410 miles. The driving time would be approximately 8 hours 15 minutes if you were to travel non-stop in good driving conditions. (The driving time does not take into consideration conditions which may extend trip time such as weather, road work and rush hour traffic in urban areas.)
What is the distance of the holland tunnel?
The channel tunnel is, on average, 45m below the seabed. (1)
The ocean depth between Dover and Calais is, on average, 50m. (2)
Hence it can be guestimated that the tunnel is, on average, roughly 100m below sealevel for the undersea section of the tunnel.
(1) http://www.channeltunnel.co.uk/Faqs.asp
(2) http://www.worldatlas.com/aatlas/infopage/englishchannel.htm
How do you build a real bridge?
The basic principle of a cantilever bridge is that the bridge is supported entirely at one end, the rest being held in place by steel pillars or beams.
Name three disadvantages of the use of stone in bridge construction?
well really go online and look it up on ask.com its not that hard to do
What two countries are connected by the Friendship Bridge?
There are at least 30 countries linked by at least 15 'Friendship Bridges'.
Afghanistan - Uzbekistan, Romania - Bulgaria, China - Nepal and many others.
Where did ruby bridges live as an adult?
Today Ruby Bridges is almost 50 years old and still lives in New Orleans, LA.
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.
