At that time they did not have the measuring devices such as one which has now. Everything had to be done by feel. Now, it has been the-art measuring means to measure even down to millionths of seconds. So of course you can determine the speed of light much better. In the experiment of Galileo also have to deal with the response of man. This is about half a second. This creates a great inaccuracy. These booms quickly by adding to the determination of the speed of light. These moves so fast that you can hardly make a good estimate without proper instruments.
The speed of light is later been well established. The speed of light in vacuum is exactly 299,792,458 meters per second. In 1983, the meter by the SI was defined as:
- The meter is the length of the path of light through a vacuum with a time interval of 1 / 299.792458-th of a second.
When people refer to the speed of light, they mean the above definition: the speed of light through a vacuum. The speed of light is usually rounded to 300,000 kilometers per second.
Later it was proved, with more precise methods, that Galileo was right. To each object is thus the earth as hard ?? ?? drawn. The speed of the objects, as they fall down, depends on the friction. A round object is much less friction than an angular object. They can move much faster through the air, they are much more streamlined. So the air flows better along the circular object, encountered less resistance. With sharp objects often creates turbulence, thereby increasing the rate extremely decreases. If you drop objects in a vacuum, they are thus all with the same gravity. In vacuum, after all, have no friction with the air. This gravity is 9.8 m / s.
- The formula of the gravitational vacuum is: s = ½g × t².
The G?? is the gravitational acceleration, so this is a constant 9.8 m / s. That is to say, for each second that the object falls, the speed of the object increases by 9.8 m / s. ½g you can also rewrite as 0.5 × 9.8 = 4.9. The ?? s ?? is the distance traveled, so the path traveled by the object. The ?? t ?? is the time in which the object accelerated.
Galileo Galilei has also done important work again with this law. So you see again that Galileo is a great physicist and has been very important in today's knowledge in physics.
His actions and his ideas were not appreciated by the church. He wrote a letter to defend himself. In that letter, Galileo argued for freedom of science. Scientists were able to bring their thoughts and opinions freely go out and perform experiments to prove or disprove theories. His letter was unsuccessful.
It was a conflict with the church and on February 23, 1616 Copernicus's work was with some other works of the same tenor prohibited. Galileo was quite rapped over the knuckles by the pope and had to abide by the Ptolemy system maintained by the church. Galileo, however, refused and wrote in 1630 ?? Dialogue on the two world systems of Ptolemy and Copernicus. ?? In which he made clear that whoever the correctness of the Copernican system was not noticed a fool. This he had violated the ecclesiastical law. Galileo had to justify themselves before the Inquisition.
The trial of Galileo Galilei lasted from April 12 until June 21 1633. The charge of the church, Thou hast faith adhered to a doctrine which is false and contrary to Scripture, namely: the sun is the center of the world and moves not from east to west and you say the earth moves and is not the center of the world. On June 22, 1633 Galileo was convicted of heresy and was forced to renounce his error openly off. He was given a short jail sentence and was allowed to return in December to his rural home in Arcetri, he became closely monitored and if until his death in January 1642 the grounds of his mansion never left.