The picture below shows three elevators, each carrying a different number of people to different floors. If all the people weigh the same, which elevator is doing the most work? (Weight = Force, and Number of floors = Amount of displacement)

Select one:
a. Elevator 1 is doing the most work.
b. Elevator 2 is doing the most work.
c. Elevator 3 is doing the most work.
d. They're all doing the same amount of work.

Air initially at 0.75 bar, 1000 k, and occupying a volume of 0.12 m^3 undergoes two processes. process 1-2: the air is compressed isothermally until the volume is halved. process 2-3: the air undergoes a constant pressure process until the volume is halved again. assume ideal gas behavior. a) determine the mass of the air, in kg. b) the work and the heat transfer for each of the two processes, in kj. (100 kj = 1 bar . m^3)

The two required components for a generator

What is the name of the perceived change in a sound wave’s frequency due to motion between the observer and the sound source?