The period is 60 seconds divided by the number of rpm's.įor example: a 78 rpm record with a 10 in diameter Since we have the diameters of the records in inches we need to convert them to the radius in meters. Where s is displacement, t is time, r is radius, and T is period. Over a time span of 1. In this scenario, we have a rotating turntable which initially has an angular speed we’ve called capital, 33 to third revolutions per minute. In this essay, we are concerned with the linear speed that is, v. We’ll call the turntable’s angular acceleration and the number of complete revolutions it makes while stopping. An LP is able to hold about 30 minutes of sound per side. Due to the evolution of the way people think. There has been much change for the speeds of the phonograph. Old-fashioned 10 inch records were played at 78 rpm. A 12 inch long-playing record (LP) is normally played at 33 1/3 rpm. A 7 inch single is normally played at 45 revolutions per minute (rpm). Many phonographs records were thin plastic discs with a diameter of 7, 10, or 12 inches (18, 25, or 30 cm). The vibrations of a cutting needle record sound. The phonograph was tin foil that was wrapped around a small metal cylinder, and was able to record sound. Edison invented the first phonograph in 1877. Up until the mid 1980s it was the most popular recorded medium. Not Suggested due to distortion potential.ħ"at 33 rpm, max time at -3 db, 7-1/2 mins.ħ"at 33 rpm, max time at -6 db, 9-1/2 mins."Ī phonograph is a device that is able to make sounds that was recorded on phonograph records. 45 rpm will serve the best."Ĭutting Specs. "More costly 78 rpm Shellac and plastic disks, as well as over the 10 and 12 inch 33 1/3 rpm discs with their preselected repertoire, 0.7 in 33 1/3 rpm. This means that it is able to make a quiet room turn to a party house." It may reach up to 33 1/3 rpm within 0.7 s. "The Wheel of Steel." Rolling Stone Technology. It is played at a speed of 45 revolutions per minute (45 rpm).
World Book Encyclopedia Millennium Edition. (Diameter = 0.300 m)When the penny is placed at the outer edge of the record." "What is the minimum coefficient of static friction necessary to allow a penny to rotate along with a 33 1/3 rpm record.
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