Which type of seismic wave does not travel through liquid? a. l waves b. p waves c. s waves d. surface waves

The free body diagram shows a box being pulled to the left up a 25-degree incline. the magnitude of the normal force is

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)

Hydrogen and helium are both members of?