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.
In fact, part of the Chinese ideogram character for paper means silk.. Ts'ai Lun's paper was made from rags, used fishing nets, hemp and China grass. The invention of paper was so important to China that the Emperor made Ts'ai Lun a noble. The Arabs got papermaking 600 years later as one of the spoils of war.S'AI LUN GETS THE CREDIT. The invention of paper is usually attributed to Ts'ai Lun, an official in the Chinese royal court, in A.D. 105. The invention of paper solved a pressing problem of the time.