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.
The Great Red Gate at the Ming Tombs near Beijing, built in the 15th century The yellow roof tiles and red walls in the Forbidden City (Palace Museum) grounds in Beijing, built during the Yongle era (1402â1424) of the Ming Dynasty Beijing became the capital of China after the Mongol invasion of the 13th century, completing the easterly migration of the Chinese capital begun since the Jin dynasty.