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 means brilliant in Chinese. Hongwu named this dynasty  brilliant because he wanted to show case Chinese society after  the Mongol expulsion and erase all memory that â¦the occupation had  ever occured. So the Ming Dynasty = the Brilliant Dynasty.   (Add on: it's not just because Ming means bright, but because it  comes from the Ming religion. In the last years of Yuan Dynasty,  there were floods from Yellow River and earthquake and the  government was corrupted.