What will a medium-mass star become at the very end of its life cycle? A. a red giant
B. a black hole
C. a white dwarf
D. a neutron star

Agas contained within a piston-cylinder assembly undergoes three processes in series: process 12: compression with pv= constant from 1 bar and 1 liter to 4 bar. process 23: constant pressure expansion to 1 liter. process 31: constant volume calculate the pressure and volume at each state, and sketch the processes on a p-vdiagram labeled with pressure and volume values at each numbered stat

Which of the following are appropriate acceleration units?

Observations show that interstellar clouds can have almost any shape and