RPM stands for revolutions per minute.
2006-11-07 03:24:44 · 5 answers · asked by t.kremser 2 in Science & Mathematics ➔ Mathematics
This is an old riddle.
Assuming the record has two sides (A and B), the record has two grooves. Each side has one continuous groove that spirals inward to the center.
As a side note, a 3.5 minute song on one side of a 45 RPM record would require 157.5 revolutions to play, so that one groove would spiral around 157.5 times.
2006-11-07 03:29:09 · answer #1 · answered by PM 3 · 0⤊ 0⤋
There is only one groove in the record. It is a long spiral. If there were several grooves, the needle would be forever stuck in the first groove.
Good trick question.
2006-11-07 03:30:40 · answer #2 · answered by ironduke8159 7 · 1⤊ 0⤋
158
45 x 3.5 = 157.5
figure on a little extra for the dead air lead in and lead off for the reocrd
2006-11-07 03:46:47 · answer #3 · answered by sparky39fire 5 · 0⤊ 0⤋
time to bust out the calculator:
about 14. when i did this on the calculator it said 13.6363636363636 so i just rounded.
2006-11-07 03:27:32 · answer #4 · answered by Hugh Jass 2 · 0⤊ 1⤋
158 ...I did the math in my head!
2006-11-07 03:34:26 · answer #5 · answered by Anonymous · 0⤊ 1⤋