Ammonia in a piston-cylinder assembly undergoes two processes in series. initially, the the ammonia is saturated vapor at p1 = 100 lbf/in.2 . process 1 − 2 involves cooling at constant pressure until x2 = 75%. the second process, from state 2 to state 3, involves heating at a constant volume until x3 = 100%. kinetic and potential energy effects are negligible. for 1.2 lb of ammonia: a. determine the heat transfer and work for process 1-2, in btu. b. determine the heat transfer for process 2-3, in btu.

Ateam of astronauts is on a mission to land on and explore a large asteroid. in addition to collecting samples and performing experiments, one of their tasks is to demonstrate the concept of the escape speed by throwing rocks straight up at various initial speeds. with what minimum initial speed vesc will the rocks need to be thrown in order for them never to "fall" back to the asteroid? assume that the asteroid is approximately spherical, with an average density p 3.84 x108 g/m3 and volume v 2.17 x 1012 m3 recall that the universal gravitational constant is g 6.67 x 10-11 n m2/kg2

Which of the following is not a part of the respiratory system? a. pharynx b. trachea c. pancreas d. larynx hurrim timed

Which terms describe the purpose of antennas on devices that use radio waves? transmit and receivemodify and amplifyamplify and receivemodify and transmit