Mechanical energy swing because of the work done by the pendulum to oppose these non-conservative forces. That the loss of mechanical energy in a system always resulted in an increase of the system's temperature has been known for a long time, but it was the amateur physicist James Prescott Joule who first experimentally demonstrated how a certain amount of work done against friction resulted in a definite quantity of heat which should be conceived as the random motions of the particles that comprise matter. This equivalence between mechanical energy and heat is especially important when considering colliding objects. In an elastic collision,
Dalian most liveable city in China according to "China Daily". Standard Mandarin is usually spoken in Dalian because it is a city with people from various locations. But Dalian natives use Dalian dialect, which belongs to the Jiaoliao Mandarin subgroup spoken in parts of Shandong and Liaoning provinces. Most of the residents of Dalian were farmers and fishermen who had come from Shandong Province in a large population move, the "Chuang Guandong", during which era Dalian was occupied by the Japanese as the Kwantung Leased Territory. The Dalian dialect incorporates a few loanwords from Japanese and Russian (very rare in Chinese),