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.
It is only natural that James I and subsequent English sovereigns would encourage production of this textile amongst the settlers of Virginia. Chinese legend tells how silk was discovered almost 5,000 years ago by Xiling Shi, the wife of the semi-mythical emperor Huanghi. Walking in the garden, the empress plucked a cocoon from a mulberry tree. The cocoon fell by accident into her cup of tea and she watched as a strong white thread unraveled. However it was discovered, the potential for such a thread was first realized in China, where silk fabric was being produced by 3000 B.C.