Physics: Galaxy Discussion Questions Solutions [upd]

This mass includes dark matter – consistent with a massive elliptical galaxy.

: Compare with Carnot between (T_0) and (2T_0): (\eta_Carnot = 1 - T_1/T_2 = 0.5). Large difference due to irreversible isochoric heating and isobaric cooling. physics galaxy discussion questions solutions

Either Newton’s inverse-square law fails at low accelerations (Modified Newtonian Dynamics – MOND), or dark matter exists. The consensus: a spherical dark matter halo with density (\rho(r) \propto 1/r^2) (isothermal sphere) yields (M(r) \propto r) and flat (v(r)). This mass includes dark matter – consistent with

Here’s a glimpse into the typical chapter coverage across the Physics Galaxy series, highlighting the breadth of topics that these discussion questions address. E=K+V=kr2+kr2=2kr2cap E equals cap K plus cap V

E=K+V=kr2+kr2=2kr2cap E equals cap K plus cap V equals k r squared plus k r squared equals 2 k r squared

Combine: Add equations to eliminate T: m1 g − m2 g sin30° − μk m2 g cos30° = (m1 + m2) a.