Mathematics and Society - OS X Lion Server

The following are additional activities and questions that can be used asa follow-up to the As the Record Turns student page.(a)(b)1Play a 33) album at 45 rpm. How is the sound distorted? Howmuch faster is the recora revolving compared to its normal ormalspeed?1Play a45 single at 33 rpm.3How is the sound distorted? Howmuch slower is the record revolving compared to its normallormalspeed?Note: Most record players have a different needle setting for 78 rpmrecords, so you should not try to play one of these records at a differentspeed.(c) Measure the time a song plays at its normal speed. (This figurecan also be found on the label.)song played at a slower or faster speed.Compute the time of the sameCd) If a song takes 3:,30 minutes (3.5 minutes) to play at 45 rpm,(e)(f)how many revolutions does the record make?If it takes 21 minutes to play one sidehow many revolutions does the turntableof an album at 3~ rpm,3make?How much farther does the needle go in one revolution when it isat the outer edge of the record than it does at the inner edge?Why doesn't the pitch of the music change as the needle getscloser to the center of the, record?Did you know that • • •the first needle used to play records was a cactus needle?78 rpm was the first speed used for records because it seemed likeaconvenient speed?RCA tried to corner the market on records when they patented the45 rpm single record with the large center hole?with the invention of more refined and sharper needles, records1could be made with finer grooves which played best at 33 3 rpm?some commercials played on radio stations run at 16 rpm and startfrom the center and play to the outside? 267