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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

How many cars cross the Forth bridge in a week?

On average, around 70,000 cars cross the Forth Bridge in a week.

What city in the US has the most bridges?

Pittsburgh, Pennsylvania holds the record for most bridges in the United States. Pittsburgh has 446 bridges while there are a total of 1900 in Allegheny County. The only city with more bridges is Venice, Italy.

What is the oldest known arch?

It's the Mycenaen Arkadiko in Greece, built in 1300 B.C. It has a tiny arch in its middle. A more impressive but more recently built bridge is the Ponte Fabricio in Rome. It was built in 62 B.C.

Why were early people able to use the land bridge?

Early people where able to use the Bering Land Bridge because during the Ice Age, a glacier came in between Alaska and Northeastern Asia and dropped the ocean level more than 300 feet.

What is reinforcement?

A stimulus reinforcement is feedback that enhances or intensifies a reaction to a stimulus. It creates a conditioned reflex. An association even can start out neutral, for example, ringing a bell and salivating. In a famous series of experiments by Dr. Ivan Pavlov around the turn of the 18th Century, dogs drooled when food was given them and a bell rung at the same time. After awhile the dogs would drool just at the sound of the bell. The sound of the bell started out neutral in relation to stimulating saliva but became a stimulus to salivation by creating a physiological association in the dogs with the bell sound and food, and then repeatedly reinforcing this association.

Did neandertals migrate across the bering bridge?

Neanderthals did not migrate across the Bering land bridge as they primarily inhabited Europe and parts of western Asia. The land bridge was used by early human populations to migrate from Asia to the Americas.

The diagnostic reading for your 99 ford exp said 2 things missed fire 2 and 5 and lean on bank 1 and 2 what does this mean?

this means that 2 and 5 pistons are not getting spark when needed. most likely that 2 and 5 both need a new coil installed

modern engines have a separate coil for each cylander. they cost approx 100 bucks each

What are the five forces that act upon bridges?

1.compression

2.tension

3.torsion

4.shear

5.gravity

What is modular ratio in rcc?

In reinforced concrete construction, the modular ratio refers to the modulus of elasticity of concrete to that of steel. It is used in structural design calculations to determine distribution of stresses between concrete and steel in beams and columns.

Is there a worksheet on 'through the tunnel'?

I'm assuming you are looking for a worksheet related to the short story "Through the Tunnel" by Doris Lessing. There are many educational resources available online that offer worksheets, study guides, and lesson plans specific to this story. You can try searching for "Through the Tunnel worksheet" to find suitable materials.

What is the history of the nursery rhyme London Bridge is Falling Down?

There have been a number of different London Bridges over the past 2000 years. The one to which the nursery rhyme refers is the one started by engineer John Rennie in 1825 and finished in 1831. The design was superior, containing only five high arches, and constructed from strong Dartmoor granite. It was opened by King William the fourth in 1831. When it became necessary to widen the bridge some 70 years later, this process weakened the bridge's foundations to the point where it began sinking an inch every eight years. In 1968, it was auctioned and sold for $2,460,000 to Robert McCulloch who moved it to Havasu City, Arizona, where it was rebuilt brick by brick, and finally opened and dedicated on 10 October 1971.

Can a marching army collapse a bridge?

A column of soldiers will never march across a bridge for this reason. The steady oscillation that occurs can, over time cause structural issues with even a well built bridge. It may not actually collapse (although not out of the question) but it can cause serious damage if the marching approaches the resonant frequency.

The classic example of resonant frequency that every engineer has had to watch the video of is the Tacoma narrows bridge. There are also many examples that Tesla explained on this subject.

What is a bridge deck?

is a cost effective, lightweight, modular deck system that lends itself to rapid construction

When is a truss called a rigid truss?

a truss is said to be rigid when there is no relative motion of any point on any member of the truss with respect to any other point on any other member of the truss. in other words, a truss is said to be rigid when the distances between any two points on the truss remain constant at all times.

What are examples of natural structures?

human skeleton

oven

egg shell

glasses case

coconut shell

pencil case

house

nut shell

car shell

tent for camping

piggy bank

easter egg

wardrobe

water bottle

Function of north bridge and south bridge?

North Bridge: CPU, Memory, GPU

South Bridge: I/O devices, keyboard, mice, NIC card

What is polyacryl?

Potassium polyacrylate

Identification Name Potassium polyacrylate

Molecular Formula (C3H6O2)n.(C3H5KO2)m

CAS Registry Number 25608-12-2

What is a steel mill?

A Mini Mill, i.e. Electric Arch Furnace (EAF) melting shredded steel scrap &/or a combination of Hot Briquetted Iron (HBI) or Direct Reduce Iron (DRI).

What phobia is the fear of whirlpools or dizziness?

Aquaphobia i think

Other Person: I have this phobia and Aquaphobia can also be called Hydrophobia which is also known as the fear of being in large bodies of water. Although some people (like me) can still drink and take regular showers in water.

What can cause pain in the tip of the nose?

How about a pimple that is under the skin . Actually a build up of bacteria . Often it's an ingrown hair. If your Ph level is off you can get a very sore little bump inside the nostril, in your mouth on your tongue, sore gums or even a sore on your lip. In a day or so the bump will go away. Most people get them.

What do the bridges have in common?

Bridges and tunnels help carry transport, goods and people. This also shortens the amount of time to travel from a place to another. They also both have different types of bridges and tunnels e.g. bridges- suspension bridge, cable-stayed bridge, beam bridge, rope bridge, swing bridge, arch bridge e.t.c. tunnels- road tunnels, high tunnels, wind tunnels, network tunnels e.t.c.

Every time you want to cross a bridge or tunnel you have to pay a toll to get through.