Analyzing old things in the attic, he found a gramophone record by Edith Piaf with a recorded song lasting 3 minutes and 14 seconds, and the playback speed of the recording on the gramophone is 45 rpm. The diameter of the plate is 6.57 inches, and the diameter of the label is 2 inches. The track width is 0.012 inches.
How many tracks are there on this record?
Answer:
On a record, one track, which is a spiral, along which the gramophone needle moves
