Another energy-related concept is called the Lagrangian, after Joseph-Louis Lagrange. This formalism is as fundamental as the Hamiltonian, and both can be used to derive the equations of motion or be derived from them. It was invented in the context of classical mechanics, but is generally useful in modern physics. The Lagrangian is defined as the kinetic energy minus the potential energy. Usually, the Lagrange formalism is mathematically more convenient than the Hamiltonian for non-conservative systems (such as systems with friction).
Who is the Lagrangian named after?
Joseph-Louis Lagrange


Input: Greece
Along with the Byzantine (Church) chant and music, the Greek people also cultivated the Greek folk song which is divided into two cycles, the akritic and klephtic. The akritic was created between the 9th and 10th centuries and expressed the life and struggles of the akrites (frontier guards) of the Byzantine empire, the most well known being the stories associated with Digenes Akritas. The klephtic cycle came into being between the late Byzantine period and the start of the Greek War of Independence. The klephtic cycle, together with historical songs, paraloghes (narrative song or ballad), love songs, mantinades, wedding songs, songs of exile and dirges express the life of the Greeks. There is a unity between the Greek people's struggles for freedom, their joys and sorrow and attitudes towards love and death.

Between what centuries was the akritic cycle of Greek song created?
Output: 9th and 10th


Input: Article: Because of Oklahoma's position between zones of differing prevailing temperature and winds, weather patterns within the state can vary widely over relatively short distances and can change drastically in a short time. As an example, on November 11, 1911, the temperature at Oklahoma City reached 83 °F (28 °C) in the afternoon (the record high for that date), then an Arctic cold front of unprecedented intensity slammed across the state, causing the temperature to crash 66 degrees, down to 17 °F (−8 °C) at midnight (the record low for that date); thus, both the record high and record low for November 11 were set on the same date. This type of phenomenon is also responsible for many of the tornadoes in the area, such as the 1912 Oklahoma tornado outbreak, when a warm front traveled along a stalled cold front, resulting in an average of about one tornado per hour over the course of a day.

Now answer this question: How fast did the 1912 tornado outbreak make tornadoes?

Output: one tornado per hour


Article: Season three premiered on January 19, 2004. One of the most talked-about contestants during the audition process was William Hung whose off-key rendition of Ricky Martin's "She Bangs" received widespread attention. His exposure on Idol landed him a record deal and surprisingly he became the third best-selling singer from that season.

Question: What year did the third season of American Idol first air?
Ans: 2004


Here is a question about this article: Frédéric François Chopin (/ˈʃoʊpæn/; French pronunciation: ​[fʁe.de.ʁik fʁɑ̃.swa ʃɔ.pɛ̃]; 22 February or 1 March 1810 – 17 October 1849), born Fryderyk Franciszek Chopin,[n 1] was a Polish and French (by citizenship and birth of father) composer and a virtuoso pianist of the Romantic era, who wrote primarily for the solo piano. He gained and has maintained renown worldwide as one of the leading musicians of his era, whose "poetic genius was based on a professional technique that was without equal in his generation." Chopin was born in what was then the Duchy of Warsaw, and grew up in Warsaw, which after 1815 became part of Congress Poland. A child prodigy, he completed his musical education and composed his earlier works in Warsaw before leaving Poland at the age of 20, less than a month before the outbreak of the November 1830 Uprising.
What is the answer to this question: The majority of Chopin's compositions were for what instrument?
****
So... solo piano


Article: Reporters in Chengdu said they saw cracks on walls of some residential buildings in the downtown areas, but no buildings collapsed. Many Beijing office towers were evacuated, including the building housing the media offices for the organizers of the 2008 Summer Olympics. None of the Olympic venues were damaged. Meanwhile, a cargo train carrying 13 petrol tanks derailed in Hui County, Gansu, and caught on fire after the rail was distorted.

Question: Where were office towers evacuated?
Ans:
Beijing