Mechanical energy mechanical energy of the colliding objects has been converted into an equal amount of heat. Thus, the total energy of the system remains unchanged though the mechanical energy of the system has reduced. A satellite of mass formula_4 at a distance formula_5 from the centre of Earth possesses both kinetic energy, formula_6, (by virtue of its motion) and gravitational potential energy, formula_7, (by virtue of its position within the Earth’s gravitational field; Earth's mass is formula_8). Hence, mechanical energy formula_9 of a satellite is given by If the satellite is in circular orbit, the energy conservation equation can be further
Dalian Metro Dalian Metro The Dalian Metro or Dalian Subway is a rapid transit system in the city of Dalian, Liaoning, China. The metro opened on 1 May 2003. The system currently in operation consists of 4 lines: Line 1, Line 2, Line 3, and Line 12. Line 1, opened in 2015 currently in operation, connects east southeast central Dalian with north Dalian. The total length is 28.34 kilometers, with 22 underground stations. Line 2, opened in 2015 currently in operation, connects east central Dalian with west central Dalian. The total length is 42.56 kilometers, with 29 underground stations. The line is