ME 3333 Chapter : Homework 5 Solutions
Document Summary
In both processes work is put into the device and the energy is stored as potential energy. If the spring or rubber is inelastic some of the work input goes into internal energy (it becomes warmer or permanently deformed) and not into its potential energy. Being warmer than the ambient air it cools slowly to ambient temperature. When the spring or rubber band is released the potential energy is transferred back into work given to the system connected to the end of the spring or rubber band. If nothing is connected the energy goes into kinetic energy and the motion is then dampened as the energy is transformed into internal energy. An ideal gas in a piston-cylinder is heated with 2 kj during an isothermal process. : u2 u1 = 1q2 1w2 = 0 since u2 = u1 (isothermal) 1w2 = m 1w2 = 1q2 = m 1q2 = 2 kj.
