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.

the answer is:

in a biology class, the teacher started explaining a new lesson about the dna structure. personally, i found this lecture hard to understand. so i decided to use my critical thinking skills to be able to understand it. i analysed the different ideas, and broke them down into smaller parts to assimilate each. then i started evaluation and tried to link what i am learning with real life experiences so that i can make sure that i know how everything i am learning relates. finally, i started questioning by researching more what i learned and asking more questions that can me through my learning process. reflecting on the information meant that i should review it. all this me greatly understand what i previously found hard to understand.

hope it !