Which of the two balls in the Leaning Tower of Pisa reached the ground first?

Both objects are in free fall, and the landing time of the object obtained from h=1 2gt is only related to the gravitational acceleration g, but not to the mass of the object, so the two iron balls hit the ground at the same time. From a scientific point of view, the landing time has nothing to do with whether the ground is flat or not, physical research is based on an ideal state, if you have to investigate whether the ground is flat, it is meaningless to drill the tip of the horns. Hope it helps.

Aristotle (384-322 B.C.), an authoritative thinker in ancient Greece, once asserted that the speed at which an object falls from a high altitude is directly proportional to its weight. For example, a ten-pound object falls ten times faster than a one-pound object.

For more than 1,800 years, this false assertion has been held to true by the faith. It was not until the 16th century that Galileo (1564-1642 AD) discovered the logical contradiction of this theory. Galileo said that if a large stone falls at a certain rate, then, according to Aristotle, a smaller stone will fall at a correspondingly slower rate.

If we tie these two stones together, how quickly will the new stone, which weighs equal to the sum of the weights of the two stones, fall? If we continue to follow Aristotle's assertion, we will inevitably come to two diametrically opposed conclusions. On the one hand, the new stone should fall less than the first big stone, because the addition of a stone that falls at a slower rate will slow down the first big stone; On the other hand, the new stone should fall faster than the first big stone, because when two stones are tied together, it weighs more than the first big stone.

These two contradictory conclusions cannot be held at the same time, which shows that Aristotle's argument is illogical. Galileo went on to assume that the speed at which an object descends is independent of its weight. If two objects experience the same air resistance, or if the air resistance is omitted, then two objects of different weights will fall at the same speed and reach the ground at the same time.

The principle of two iron balls landing at the same time is the law of free fall. Two objects of different masses and volumes fall at the same speed because they have the same material, the same density, and according to the principle of free fall and gravity.

The two iron balls hitting the ground at the same time are about Galileo's Leaning Tower of Pisa test. In 1590, Galileo Galilei made the famous experiment of two iron balls of different weights in free fall on the Leaning Tower of Pisa, a 10-pound iron ball and a 1-pound iron ball fell from the Leaning Tower of Pisa at the same time, and both iron balls landed at the same time. Galileo's experiment overturned the ancient Greek philosopher Aristotle's doctrine that "the speed of falling of an object is proportional to its weight", and corrected this erroneous conclusion that had lasted for 1,900 years.

Galileo's full name was Galileo Galilei and he was born on February 15, 1564 in Pisa, Italy. Galileo was a great physicist, astronomer, and philosopher, and a pioneer of modern experimental science. Galileo was also an inventor, he invented the thermometer and the astronomical telescope, made great contributions to modern physics, and is known as the father of modern science.

The Leaning Tower of Pisa has a total of 8 floors.

The Leaning Tower of Pisa (Italian: Torre Pendente di Pisa or Torre di Pisa, English: Leaning Tower of Pisa) was built in August 1173 as a free-standing bell tower of the Cathedral of the city of Pisa, Italy, located in Piazza del Miracoli, north of the city of Pisa, in the province of Tuscany, Italy.

The large lawns of the Piazza de la Miracoli are dotted with a group of religious buildings: the Cathedral (built in 1063-13th century), the Baptistery (built in 1153-14th century), the bell tower (the Leaning Tower of Pisa) and the Necropolis (built in 1174), all of which are clad in cream marble.

The Leaning Tower of Pisa is located behind the Cathedral of Pisa. The Leaning Tower of Pisa is 55 meters high from the ground to the top of the tower, the width of the bell tower wall on the ground is meters, the width at the top of the tower is meters, the total weight is about 14,453 tons, and the center of gravity is meters above the foundation.

The circular foundation has an area of 285 square meters and an average pressure on the ground of 497 kPa. The angle of inclination deviates from the outer edge of the foundation by meters, and the top layer protrudes by meters. The tilt was first discovered in 1178.

Leaning Tower of Pisa: "Leaning" and "righting" in a race

In October 2013, Italy** reported that the world-famous Leaning Tower of Pisa had finally stopped tilting, as the latest survey found that the tilt of the tower had decreased by centimeters between 2001 and 2013.

The 800 years of the Leaning Tower of Pisa have been a history of "tilting and righting".

In 1944, during World War II, an American soldier named Wickstein was ordered to scout at the Leaning Tower of Pisa. He received an order to destroy the tower as soon as it was discovered that there were German troops in it.

Wickstein prostrated in front of the sloping bell tower for hours, without any movement, the sun shining on the graceful white tower, "What a beautiful building, and I was moved with compassion." Fifty years later, Wickstein recalls the scene, still mesmerized by the scenery.

Just as Wekestein decided to leave, a bullet from the tower suddenly flew over his head, and Wekestein hesitated, he didn't want this beautiful shadow to be ruined in his own hands. At the last moment, the U.S. military called for a retreat, and the American GI turned and left. During World War II, Pisa was subjected to heavy artillery fire, but the Leaning Tower of Pisa only slightly damaged a small column.

If the Leaning Tower had a soul, it would have no time to worry about its fate in war, because from the moment it was born, it was constantly fighting to the death against the laws of nature and physics. Whether the Leaning Tower of Pisa will fall down in the future is a concern for all Pisan people.

The 8-storey Leaning Tower of Pisa (Campanile di Pisa) is actually part of the Duomo Church, which is divided into three parts: the main church, the baptistery and the bell tower. The main church is in the Latin crucifixion, decorated with some elegantly designed columns; The church is fronted by the Baptistery, which was built immediately after the church; At the back there is a Romanesque building, the dome part of which was built more than 100 years later, with a Gothic design, like a cone on a ball, which is very unique.

The Leaning Tower of Pisa is more than 20 meters from the cathedral, which was originally the bell tower of the cathedral, and the appearance is cylindrical and made of white marble. The foundation of the tower was inscribed in Latin in 1174 and was completed in 1350; But in fact, the ancient calendar used in Pisa predates the Gregorian calendar by one year, so the Leaning Tower of Pisa was built in 1173. The Leaning Tower of Pisa is said to have been built with six trophies brought in by the Pisa fleet.

The Leaning Tower of Pisa is 16 meters high, 16 meters in diameter and weighs about 10,000 tons. The Leaning Tower has eight floors, and the structure of the remaining six floors is exactly the same, except for the difference between the ground floor and the top floor. There are 15 columns on the ground floor, 31 columns on each of the six middle floors, and 12 columns on the top floor.

There is a 4-meter-wide circular walkway along the stone pillar. There are arches on each floor of the Leaning Tower, 213 in total, the lower walls of the Leaning Tower are carved in relief, and the top floor has a bell pavilion. There are 294 spiral steps in the tower, for visitors to climb the tower, overlooking the scenery of the whole city.

The Leaning Tower of Pisa is one of the world's architectural wonders. Due to the excessive pressure and soft ground of the tower, the foundation on the south side is about 2 meters lower than that on the north side. During the construction period, the tower body was slightly tilted, and the inclination increased as the project progressed.

When the tower was built to the third floor, the tilt was clearly visible, and the work was stopped for a time. More than 100 years later, the engineer Tommaso Pisano carefully measured and calculated that the Leaning Tower of Pisa would not collapse, although it was tilted, so that the project continued to be built according to the original design until it was completed.

As the Leaning Tower tilts more and more severely (millimeters per year), it is expected that it will eventually fail to resist gravity and fall. In order to save the Leaning Tower, Italy did everything it could, and finally supported it with steel, and no longer opened the interior of the Leaning Tower, and carried out comprehensive conservation work. After 11 years of renovation, the Leaning Tower was reopened to the public in 2001 and ensured that it would not collapse for the next 250 to 300 years.

Eight floors. Construction began on August 9, 1173 when it was designed to be erected vertically, with eight floors and a height of meters, but in 1178, when the bell tower was built on the fourth floor, it was found that the bell tower had been tilted to the southeast due to uneven foundations and soft soil, so the work was suspended. In 1231, the works continued.

In 1278, when the tower reached the 7th floor, it was no longer straight, but concave. The works were suspended again. In 1360, after almost a century of stagnation, the bell tower made its final sprint towards completion, with one last major correction.

In 1372 the top floor of the bell was completed. The 54-meter-high, eight-story bell tower has a total of seven bells, but it has never been struck because the bell tower is in constant danger of collapsing. And it's been constantly sloping downward.

The Leaning Tower of Pisa is located in Piazza della Miracolia, north of the ancient city of Pisa in the province of Tuscany, in western Italy. The Leaning Tower of Pisa was built in 1173 by the famous architect Nano Pisano. It is located on the right behind the Romanesque Cathedral and is the symbol of the city of Pisa.

In 1987, Piazza del Duomo was inscribed as a "World Cultural Heritage".

Extended Materials. Description: The large lawn of the Piazza de la Miracoli is dotted with a group of religious buildings: the Cathedral (built in 1063-13th century), the Baptistery (built in 1153-14th century), the bell tower (the Leaning Tower of Pisa) and the Necropolis (built in 1174), all of which are clad in cream marble.

The Leaning Tower of Pisa is located behind the clear section of the Pisa Cathedral.

Reason for tilting: The leaning tower of Pisa is tilted due to the peculiarities of the soil layer under its foundation. Under the Leaning Tower of Pisa there are several layers of soil of different materials, formed by the sediment of various soft silt and very soft clay, and at a depth of about one metre there is an aquifer.

This conclusion was made after the observation of the composition of the soil layer of the foundation. Recent excavations have shown that the bell tower was built on the edge of the coast in ancient times, so the soil was sandy and sunken at the time of its construction.

History and culture: Legend has it that in 1590, the Italian physicist Galileo Galilei, who was born in Pisa, did a free fall experiment on the Leaning Tower of Pisa, and threw two spheres of different weights from the same height at the same time, resulting in the two lead balls landing almost at the same time, thus discovering the law of free fall, overturning Aristotle's previous belief that a heavy object will reach the ground first, and the speed of the falling body is proportional to its mass.

The relatives in Italy belong to Europe. It was built in August 1173.