20 Years of 9/11 Attacks: What Happened in the United States on September 11, 2001?

    

20 Years of 9/11 Attacks: What Happened in the United States on September 11, 2001?

 20 Years of 9/11 Attacks: What Happened in the United States on September 11, 2001?

Twenty years ago today, a terrorist attack took place in New York City, USA, which changed the world scene.

 

It was Tuesday, September 11, 2001, when suicide bombers hijacked four American passenger planes and planned to hit them at key locations in New York and Washington.

 

Three of the planes managed to reach their targets, while one crashed before reaching its target.

 

These attacks are known as the 9/11 attacks, which killed nearly 3,000 people and are considered one of the most tragic events of the 21st century, not only for Americans but for the entire world.

Where did the planes come from and what was their target?

The total number of hijackers who hijacked four American planes was 19, including at least four pilots.

The hijackers hijacked two Boeing 767s and two Boeing 757s belonging to American Airlines and United Airlines.

 

The planes were flying long distances from the east to the west of the United States and had more than the same amount of fuel.

 

The first target of the terrorist attacks was the World Trade Center in New York's Financial District, whose two towers were hit by two Boeing 767s from American Airlines and United Airlines.

 

Flight 11 of the American Airlines flight from Logan Airport in Boston, Massachusetts to Los Angeles crashed into the north tower of the World Trade Center at 08:46 local time after being hijacked. The plane hit the 93rd to 99th floor of the tower.

 

The world had not yet recovered from the shock that 18 minutes later, millions of people around the world watched on their TV screens United Airlines Flight 175, flying from Logan Airport, crashing into the South Tower at 09:03.

 

The third hijacked plane flew from Washington Dallas Airport in Virginia to the capital, Washington DC, and hit the western part of the Pentagon at 09:37 local time.

 

The fourth plane, which took off from Newark Airport, was said to have targeted the US Capitol in Washington, D.C. The plane crashed at 03 minutes when the passengers of the plane resisted after hearing the news of other attacks.

 

How many people were killed?

 

The attacks killed 19 hijackers and 2,977, most of them from New York.

 

The youngest to die in the attacks was two-year-old Christine Lee Hansen, who was on a plane with her parents, Peter and Xu.

 

9/11 attacks in the United States: Why did the twin towers of the World Trade Center collapse, what does science says?

 

The morning of September 11, 2001. Two Boeing 767s slam into the twin pinnacles of the World Trade Center. With 110 stories, it was the tallest structure in New York.

 

The principal plane collided with the North Tower at 8:45 p.m. The structure burst into flames for 102 minutes and afterward at 10:28 a.m.

 

The principal plane collided with the North Tower at 8:45 p.m. The structure burst into flames for 102 minutes and afterward at 10:28 a.m.it collapsed in just 11 seconds.

 

Eighteen minutes after the first plane crashed, another crashed into the South Tower. It burst into flames for 56 minutes and afterward at 9:59 a.m. it fell to nine seconds.

 

Bruno Delinger worked on the 47th floor of the North Tower and survived the crash. He recalls that "after the terrible sound of the building collapsing, it became dark at night." There was no sound, no breathing. "

 

"I was persuaded that I was dead on the grounds that the cerebrum couldn't endure something like this," he said in an assertion dated September 11 at the New York Museum.

 

For what reason did the twin pinnacles of the World Trade Center breakdown?

 

"The appropriate response, acknowledged by every genuine individual, is that the pinnacle fell because of a psychological oppressor assault," said Eduardo Cossell, a structural specialist with MIT's Civil and Environmental Engineering Department.

 

In the repercussions of the 9/11 assaults, Kosel drove a few examinations, with MIT specialists inspecting the reasons for avalanches as far as designing and engineering.

 

Kosel's reaction revealed the physical and synthetic points of the fiasco that were incredible at that point.

 

The MIT study, distributed in 2002, is like the US government study charged by the National Institute of Standards and Technology (NIST).

 

It attempted to discover how the twin pinnacles at long last imploded. The last examination in such manner was distributed in 2008.

 

As per MIT and NIST contemplates, the twin pinnacles fell for two reasons:

 

The plane collided with the two structures, causing primary harm.

 

The fire had spread to several floors

"In the event that it hadn't been for the fire, the structures couldn't have ever fallen, and if there had been a fire without underlying harm, the two pinnacles would not have imploded," says Kosel.

 

"There was a ton of solidarity in these pinnacles," he said.

 

The NIST report said that as per official records, the plan of these pinnacles empowered them to withstand the impact of a Boeing 707 airplanes.It was the largest commercial aircraft at the time of its design.

 

Be that as it may, NIST analysts say there is no data on how they arrived at this resolution.

 

It is clear that the damage caused by the plane crash and the resulting fire had devastating effects, causing both towers to collapse.

    

How was the twin pinnacles of the World Trade Center constructed?

 

The plan of the twin pinnacles was up to standard during the 1960s. That was when the construction began.

 

Both buildings used steel pillars and had concrete in the middle. They also had elevators and stairs.

 

Each floor had level steel structures that framed the establishment and were joined to steel columns. They structure the external dividers of the structure.

 

With the assistance of this design, the heaviness of each floor was lifted by the columns while each floor forestalled the twisting of the columns.In structural designing it is additionally called 'clasping'.

 

This steel structure was covered with substantial which secures it if there should arise an occurrence of fire. The steel had a flame resistant layer to ensure it if there should be an occurrence of fire.

 

 

Plane crash, fire and wind

Various models of Boeing 767 airplanes crashed into the two pinnacles. They are bigger than the Boeing 707.

 

According to the NIST report, the pillars caused "severe damage" to the plane and its fireproof layer was removed.

 

Kosel says the quake made the flame resistant layer separate from the steel structure, which was then harmed by the fire.

 

Flying bombs

 

As indicated by true figures, the two planes had around 10,000 gallons of fuel, or in excess of 37,000 liters.

 

Kosel says it was like "flying bombs."

 

A large portion of the fuel was scorched during the fire, however a significant part of the fuel started to spread to the lower floors of the pinnacle.

 

The fire spread to the base and inundated numerous combustible articles, expanding its size.

 

The fire spread to the base and immersed numerous combustible items, expanding its size.

 

MIT designs further clarify that the fire caused two significant harms:

 

The first was that extreme heat forced the steel structure to spread on every floor. The floor started to isolate from the columns. As the columns spread, the segments of the structure started to move outwards.

 

Second, the fire softened the steel pillars, weakening it.

 

The strong building looked like a rope and as it started to fall, it turned inwards.

 

"It was annihilating for the pinnacles," says Kosel.

 

When the tower collapsed

 

Before the towers collapsed, all the components of its collapse had been completed.

 

The mainstays of the structure were at this point not upstanding.They were turning in and out, and the building began to tremble.

 

As per the NIST report, the columns started to fall in a bended shape as the design attempted to pull them inwards.

 

Kosel's audit uncovered that at one point the design pulled the column so hard that the bolts appended to the section broke. This made the floors stack up like playing a game of cards, and the weight was deplorable for the lower floors.

This tension added to the already weakened column. The result was a horrible scene.

Kosel says that as the structure advanced toward Freefall, pneumatic stress between the floors constrained the air out quicker.

As it fell, smoke started to ascend as mists.

The two structures vanished in practically no time, yet the destruction consumed for 100 days.

Be that as it may, presently, after 20 years, the dread of such assaults isn't finished.