Today’s Question – Alex was as usual down in the basement with his imaginary friend when he found an old phonograph turntable and a long play vinyl record. The diameter is 12 inches. The unused center containing the hole, label, etc. has a diameter of 4 inches. The record has a smooth out ring which is 1 inch wide around the whole record. If the grooves equal 91 to the inch, how far does the needle travel while playing the entire first side?

Reveal Answer Answer - Even though it hurt Alex\xe2\x80\x99s head to think about it - The number of grooves per inch is meaningless since the needle only moves sideways. So the distance traveled is three inches.

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