Discussion Questions Solutions — Physics Galaxy

Why do elliptical galaxies have much larger $M/L$ ratios than spiral disks? What does this imply about their formation?

A block is attached to a spring (massless) fixed at one end. A bullet hits the block and embeds itself. Discuss the energy loss. Is the maximum compression of the spring independent of the collision time? physics galaxy discussion questions solutions

The electric field is a vector field that represents the force per unit charge at a given point, whereas electric potential is a scalar field that represents the potential energy per unit charge. Why do elliptical galaxies have much larger $M/L$

(stars + gas) gives (M_\textvis(r)) → constant as (r) grows → (v(r) \propto 1/\sqrtr). This fails. A bullet hits the block and embeds itself

The tiny SMBH is a power plant not because of its size, but because accretion extracts gravitational energy with extreme efficiency, limited only by the Eddington luminosity.