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.
Inventions: Porcelain. Porcelain was a very gorgeous looking pottery, it was invented in China during the Ming Dynasty. This was a important invention during the Ming Dynasty because the porcelain had been exported all around the world.The porcelain had many types of designs and colors on it, but never blue.Until one day they found out on how to make the blue, they also had founded out about manganese.nventions: Porcelain. Porcelain was a very gorgeous looking pottery, it was invented in China during the Ming Dynasty. This was a important invention during the Ming Dynasty because the porcelain had been exported all around the world.