A high school physics competition tutorial on the use of perturbation method in orbital dynamics, with heavy use of integral calculus.
https://misskey-taube.s3.eu-central-1.wasabisys.com/files/458d10b8-a055-46ba-bd04-6cac05cb3f6d.webp
High school physics competition in China be like: Solving orbital dynamics problems via perturbation. Possibly one of the most ridiculously difficult exams in the world. It's like what happens when too many people are mining on a blockchain, the PoW difficulty just keeps increasing until it's barely solvable.
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