High-speed motion of gas and stars near the milky way galaxy's center is explained by

Explain why the aperture of the spherical mirror should be small compared to the radius of curvature of the mirror.

Agas initially at p1 = 1 bar and occupying a volume of 0.5 liter is compressed within a piston–cylinder assembly to a final pressure p2 = 4 bar. (a) if the relationship between pressure and volume during the compression is pv = constant, determine the volume, in liters, at a pressure of 3 bar. (b) repeat for a linear pressure–volume relationship between the same end states. reference

What are the applications of electromagnetic waves