Air expands adiabatically in a piston-cylinder assembly from an initial state where p1 = 100 lbf/in. 2, v1 = 3. 704 ft3/lbm, and t1 = 1000 or, to a final state where p2 = 50 lbf/in. 2 the process is polytropic with n = 1. 4. The change in specific internal energy, in btu/lbm, can be expressed in terms of temperature change as du = (0. 171)(t2-t1). Determine the final temperature (in or). Kinetric and potential energy effects can be neglected.

Which of the following ideas did greek philosopher democritus contribute to the atomic theory? a. each object is made up of one atom, which varies in size from very small to very large. b. matter is composed of only one kind of particle, which can be easily destroyed. c. every element has a specific type of atom, which remains the same size in all forms of matter. d. all matter is composed of small particles, which combine to make larger objects.