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.

Ababy stroller is a rest on top of a hill which is 10 m high. the stroller and baby have a mass of 20 kg. what is the potential energy of the baby and stroller?

Which of the following are properties of mechanical waves? check all that apply ⭕️ particles of the medium move back and fourth, but do not move with the wave. ⭕️ the particles of the medium always move parallel to the wave motion. ⭕️ wave motion begins with a disturbance in the medium. ⭕️ waves transport energy from a source outward, away from the source.

Samir watches a 100-minute movie on his spaceship. maria's spaceshipe flies in the same direction as samir's spaceship but she observes his move to last 125 minutes and his spaceship to be 40 m long. how long does samir observe his own spaceship to be? according to an observer on earth, planet x is stationary. maria and samir depart earth on their spaceships at the same time, each flying at 0.5c. maria flies toward planet x and samir flies in the opposite direction. according to maria, her voyage to planet x takes 9 years. how many years does marias voyage take according to samir?