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.
These are just few of the great inventions of Ming dynasty which swept through the ages all over the world. These contributions are up to now widely used, leaving a lasting mark not only in the history of China but of the world.hese are just few of the great inventions of Ming dynasty which swept through the ages all over the world. These contributions are up to now widely used, leaving a lasting mark not only in the history of China but of the world.