Double pendulum?

[golgiapparatus88]

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My mcat is next friday so I'm trying to think of abstract topics that may be on the test. Is there anything special about a double pendulum that would change when compared to a normal pendulum?

I'm guessing when the amplitude is at a max, the second pendulum should be point towards the center due to conservation of energy and momentum. Other than that, not sure what else would change! Any ideas?

 

[fizzgig]

based on my zero experience, my guess would be if they give you a double pendulum they'd want you to be able to calculate the ctr of mass between the 2 and recognize that it's not at the full length L anymore. L slightly shorter since some mass shifted up, period changes.