For those wanting to answer the question: "How long would it take for me to fall through the earth assuming it was in a vacuum?", the Minute Physics Channel on You Tube has an answer. The math on some of the problems may be a bit daunting but the visuals are good and it is easy to understand some fairly difficult concepts. It also has some practical applications. Is it better to walk or run through the rain if you want to be less wet?
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