Il A heavy ball with a weicht of 100 N (m 10.2 kg) is hung. from the ceiling of a lecture hall on a 4.5-m-long rope. The ball. is pulled to one side and released to swing as a pendulum, reach-. ing a speed of 5.5 m/s as it passes throuoh the lowest point.
Inventions. The huochong gun was invented in China during the Ming dynasty. It was also called the tongjiangjun, which meant bronze general. This was an important invention of the time period because the Ming Dynasty was creating weapons to defend their dynasty, and they came across the gun.t was also called the tongjiangjun, which meant bronze general. This was an important invention of the time period because the Ming Dynasty was creating weapons to defend their dynasty, and they came across the gun.
Ming Dynasty Timeline Timeline Description: They Ming Dynasty ruled China from 1368 to 1644. It was a period of native Chinese leadership that came in between Mongol and Manchu rule. It was founded by Zhu Yuanzhang, who proclaimed himself emperor in Yingtian. Date Event 1367 Zhu Yuanzhang's army eliminates the military forces of the Yuan Dynasty. After a seven-year battle, Zhu Yuanzhang's army ends the rule of the Yuan Dynasty. Several years earlier Zhu had taken his army into Jiqing, established a military base there as part of his plan to control all of China. 1368 Zhu declares himself the emperor of China.