gdpark.bloghttps://gdpark.blog/Recent content on gdpark.blogHugoenFri, 17 Apr 2026 00:00:00 +0000Hello, worldhttps://gdpark.blog/posts/hello-world/Fri, 17 Apr 2026 00:00:00 +0000https://gdpark.blog/posts/hello-world/<p>Welcome to <strong>gdpark.blog</strong> — notes on physics, finance, CFA, programming, and AI.</p> <p>Math rendering test:</p> $$ \vec{r}_{cm} = \frac{\sum \vec{r}_i m_i}{\sum m_i} $$<p>Inline math works too: $E = mc^2$.</p>Center of Mass (CM) — Classical Mechanics Notes #13https://gdpark.blog/posts/center-of-mass/Fri, 07 Nov 2014 00:00:00 +0000https://gdpark.blog/posts/center-of-mass/Understanding the center of mass of a system of particles — the intuition behind the definition, and why the CM velocity just drops out by differentiating.