The Song dynasty (Chinese: 宋朝; 960–1279 CE) provided some of the most significant technological advances in Chinese history, many of which came from talented statesmen drafted by the government through imperial examinations.
The ingenuity of advanced mechanical engineering had a long tradition in China. The Song engineer Su Song admitted that he and his contemporaries were building upon the achievements of the ancients such as Zhang Heng (78–139), an astronomer, inventor, and early master of mechanical gears.[1] The application of movable type printing advanced the already widespread use of woodblock printing to educate and amuse Confucianstudents and the masses. The application of new weapons employing the use of gunpowder enabled the Song to ward off its militant enemies—the Liao, Western Xia, and Jin with weapons such as cannons—until its collapse to the Mongol forces of Kublai Khanin the late 13th century.
Notable advances in civil engineering, nautics, and metallurgy were made in Song China, as well as the introduction of the windmill to China during the thirteenth century. These advances, along with the introduction of paper-printed money, helped revolutionize and sustain the economy of the Song dynasty.
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The Founders determined that a republic was the best form of government for the new nation because it supported Americans’ philosophical beliefs and governing principles of freedom, popular sovereignty or the people’s rule, consent of the governed, and limited self-government.
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It would be mountainous
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these forces are called interaction force pairs and Forces always come in pairs
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Sir Issac Newton was a great scientist. Besides he was great mathematician, astronomer, physicist and author. He was one of the most influential people of all time. Newton's most famous "the laws of motion" was a historic discovery and it lead to many new scientific discoveries and new laws in the universe.
One of the laws of motion of Newton is called Third law of Newton. It speaks about the forces of interaction when two bodies or objects are in contact and they apply force on each other. These forces are the action force of one body and the reaction force of the other body. They always works in pairs and so are called interaction force pairs.