Clear vector graphics for free-body diagrams, phase space plots, and orbital trajectories.
You might wonder why you need the instructor’s manual. There is a "Student Solutions Manual" for Marion & Thornton (often by Stephen T. Thornton himself). However, the student version: Clear vector graphics for free-body diagrams, phase space
He ran a hand through his hair, his eyes burning. He had sketched the normal modes, wrote out the Lagrangian twice, and checked his algebra three times. He was lost in a forest of $x$'s, $\dotx$'s, and $\lambda$'s. Clear vector graphics for free-body diagrams
When searching for the 5th edition solutions manual online, quality varies drastically. Many files are poor-quality scans with illegible subscripts, missing minus signs, or cut-off margins. What Makes a PDF Copy "Better"? phase space plots