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I put Davisson Germer showed electrons had wave-like properties. I also put the photoelectric effect experiment showing light had particle-like properties and that photons exist,

Well fuck. I was having a good day and now I just want to kms.😖💀

I think you can't cancel out the masses because in the centripetal force the mass is the mass of the car (since it is the car that spinning) and in gravitational force the mass is the mass of the bob? Correct me too if I'm wrong.

Did you have mass in you formula at all?

Firstly try your absolute best not to look at the answers. Throw you've learned that you think may be relevant at the question first. Secondly if you look at the answers try to locate the key step. Note it down and remember it for future questions. Also just do as many questions as you can get...

Mid to high 80s is more accurate, I know people from a school ranked in the 500's with slightly better ranks than you that get in the low 90s. Then again your externals matter more than anything so you can't be sure now anyway.