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How many grooves are there on a gramophone record that turns at 45 rounds per minute?
Wiki User
∙ 14y ago
There is only ONE long, continuous groove on the record.
One end of it is near the outer edge. The other end is near the center.
If you draw a straight line from the edge of this record to the center, the number of times
the line crosses the groove is
(number of minutes the record plays) divided by (45).
Wiki User
∙ 14y ago
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