A record is 12" in diameter and has two sides. The gap between the edge and the start of the grooves is 1/4"; the gap between the end of the grooves and the center hole is 3". Each groove is about 1/100" wide. How many grooves are on a record?
2006-08-08 13:12:14 · 7 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
2
2006-08-08 13:16:09 · answer #1 · answered by tripforyou 5 · 0⤊ 0⤋
Two. One on each side.
The radius of the record is 6", minus 3.25" of gap = 2.75 " occupied by the groove on each side.
2.75 * 100 = 96.75 turns per side
If the record is played at 33.33 RPM...
96.75 / 33.33 = 2.9 minutes of playing time per side
2006-08-08 13:17:07 · answer #2 · answered by QuietFire 5 · 0⤊ 0⤋
1 groove on each side, it's the same groove that goes roundy roundy across the record.
2006-08-08 13:19:33 · answer #3 · answered by Poncho Rio 4 · 0⤊ 0⤋
Tricky, tricky. There are 2 continuous groves (1 on each side).
2006-08-08 13:37:10 · answer #4 · answered by jsn77raider 3 · 0⤊ 0⤋
1 on each side
2006-08-08 13:18:44 · answer #5 · answered by litespeed2rw 6 · 0⤊ 0⤋
Groovy!
2006-08-08 13:20:49 · answer #6 · answered by nosoccertyvm 3 · 0⤊ 0⤋
two really long ones
2006-08-08 16:51:13 · answer #7 · answered by jimbob 6 · 0⤊ 0⤋