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26 Nov 2019
Compact discs and long-playing records are made fromsimilarmaterials. The former have a diameter of about 12cm, andthe latter, about 32 cm. When in use,records spin at33.333 rev/min, and compact discsspin at, say,365 rev/min. Ignoring the holes inboth objectsand assuming that a compact disc has half the thicknessof a recordand 0.90 of its density, what is the ratio of theangular momentumof a compact disc in use to that of a record?
Compact discs and long-playing records are made fromsimilarmaterials. The former have a diameter of about 12cm, andthe latter, about 32 cm. When in use,records spin at33.333 rev/min, and compact discsspin at, say,365 rev/min. Ignoring the holes inboth objectsand assuming that a compact disc has half the thicknessof a recordand 0.90 of its density, what is the ratio of theangular momentumof a compact disc in use to that of a record?
Hubert KochLv2
14 Jun 2019
