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Nebwork.phys.yorku.ca/ Nebwork.phys.yorku.ca/ revious roblem Lis Next (b) Calculate the angular velocity when it is reading at r-2.7 cm from the center of the DVD (1 point) THE PROBLEM A standard DVD has a diameter of d-12 cm. Some DVD players read data at constant linear speed, which means the player must adjust the angular speed depending on whether it is trying to read near the center of the disc or near the edge of the disc. For example, suppose your DVD player reads at u=1.33 m/s (a) Calculate the angular velocity when it is reading at the outer edge of a DVD (b) Calculate the angular velocity when it is reading at r-2.7 cm from the center of the DVD PAPER SOLUTION INTERPRET DEVELOP EVALUATE Calculate a numerical value for the angular velocity while reading at the outer edge Wedge rad/s = rpm PAPER SOLUTION INTERPRET DEVELOP Calculate a numerical value for the angular velocity while reading at r from the center EVALUATE Calculate a numerical value for the angular velocity while reading at the outer edge rad/s = wedge 1 rad/s= rpm ASSESS rpm Note: In order to get credit for this problem all

Explanation / Answer

a] angular velocity when it is reading at the outer edge :

Wedge = v/R = 1.33/0.06 = 22.17 rad/s

= 22.17*60/(2pi) rpm = 211.7 rpm

b] Wr = v/r = 1.33/0.027 = 49.26 rad/s

= 49.26*60/(2pi) = 470.4 rpm

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