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.
The Forbidden City was built in the early Ming dynasty by the third emperor Zhu-Di. When the founder of the Ming dynasty died in 1398 after thirty-one years of rule, power passed to his grandson Jianwen.Jianwen was a studious Confucian and a man of integrity, but he was too much of an idealist to rule the Ming empire effectively.hen the founder of the Ming dynasty died in 1398 after thirty-one years of rule, power passed to his grandson Jianwen. Jianwen was a studious Confucian and a man of integrity, but he was too much of an idealist to rule the Ming empire effectively.