Mechanical energy nonconservative forces, like frictional forces, will be present, but often they are of negligible values and the mechanical energy's being constant can therefore be a useful approximation. In elastic collisions, the mechanical energy is conserved but in inelastic collisions, some mechanical energy is converted into heat. The equivalence between lost mechanical energy (dissipation) and an increase in temperature was discovered by James Prescott Joule. Many devices are used to convert mechanical energy to or from other forms of energy, e.g. an electric motor converts electrical energy to mechanical energy, an electric generator converts mechanical energy into electrical energy and a
Port of Dalian million tons in 1995. In 2016, cargo throughput for the Port of Dalian reached 355 million tons, which was up 5.5% from 2015. Lifting capabilities are between 3 – 120 tons at working radius 3 – 30 meters. The Port of Dalian's DCT, DPCM, and DICT have a total of 13 berths with alongside depths from 9.8 to 16 meters (32.2 to 52.5 feet) The port is around 503.55 mi (932.58 km, from Koje (South Korea) To Dalian (China). The sailing time is estimated 1 day sea Port of Dalian The Port of Dalian (38° 55' N 121° 41' E)