As noted in the introduction, some scientists have proposed that dark matter does not really exist. according to this view, all matter is ordinary (baryonic), but at large distances from matter, gravity does not precisely obey either newton's or einstein's theories of gravity. is this alternative view of gravity consistent with what we observe in the bullet cluster? why or why not?

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 type of bond is found between the atoms of a molecule? a. metallic b. delocalized electron c. covalent d. ionic

What is the average speed of a car that travels 40 mph for 1 hour and 60 mph in another hour?