13. What force does a 60 kg person exert on the floor? Are there any other forces at work
here?

True or false: the revolution of the earth creates day and night as it rotates around the sun

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)

Chemical energy is a form of energy. a. heat b. kinetic c. potential d. electromagnetic