In any given physics problem, you have a certain list of parameters at your disposal: masses, charges, lengths, and so on, and fundamental constants like G and c. And you're looking for an answer with some particular units.

Dimensional analysis is a strategy to figure out how you can combine the given parameters to get the correct units of the answer you want. And often times this approach can get you 90% of the answer with minimal effort.

I'll show you how to apply it to three very different problems: the period of a pendulum, the binding energy of a hydrogen atom, and the event horizon radius of a black hole.

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