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.
Ruling China for more than 300 years, the dynasty boasted of its economic growth, artistic achievement as well as numerous scientific advances. Therefore, the period was also known as - the Chinese Renaissance. The scientific development in the Song Dynasty ranked forefront in the world of the time. The world-shaking China's three greatest inventions-the gun powder, compass, movable-type printing were invented at that time, which altered the whole world's civilized rate of progress.