The flat rotation curve is the strongest evidence for dark matter. Its distribution dominates galactic dynamics, contributing ~90% of the galaxy's mass within the virial radius.
Plug numbers (g = 9.8 m/s²): m1 g = 3·9.8 = 29.4 N. m2 g sin30° = 5·9.8·0.5 = 24.5 N. m2 g cos30° = 5·9.8·(√3/2) ≈ 5·9.8·0.8660 = 42.4 N. f_k = 0.2·42.4 = 8.48 N. physics galaxy discussion questions solutions
note occasional errors in solutions; always cross-verify results with fundamental laws if a solution seems illogical. Sample Discussion Concepts & Solutions The flat rotation curve is the strongest evidence
For those looking to explore more advanced topics in galaxy physics, some areas of interest include: m2 g sin30° = 5·9
In conclusion, Physics Galaxy discussion questions help students to understand and apply fundamental physics concepts. The solutions provided above demonstrate the importance of understanding key concepts such as distance and displacement, inertia, speed and velocity, energy, and friction. By mastering these concepts, students can develop a deeper understanding of the physical world and build a strong foundation for further study in physics.
For rolling without slipping: a = g sinθ / (1 + I/(MR^2)), where I for solid cylinder = (1/2) MR^2. Thus I/(MR^2) = 1/2 → a = g sinθ / (1 + 1/2) = (2/3) g sinθ.
Assume a test star in circular orbit: [ \fracmv^2r = \fracG m M(r)r^2 \quad \Rightarrow \quad v(r) = \sqrt\fracG M(r)r ] For (v(r)) constant, we need (M(r) \propto r).