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.
by Colleen Dumas. Paper money was made by the Tang Dynasty in China in 740 B.C. They made the paper money as an offshoot of the invention of block printing. Block printing is like stamping. Some people used the process for quilts, but the government made ready use of it in printing money. They made paper money because their devalued coins were becoming too heavy to carry. Before the Tang invention there were many other ways to buy things.