Question

When being burned in a writable CD-R drive, the angular speed of a CD is often much faster than when playing audio, but the angular speed still varies to keep the linear speed constant where the disc is being written. When writing along the outer edge of the disc, the angular speed of one drive is about 4800 RPM (revolutions per minute). Find the linear speed if the CD has diameter of 120 millimeters.

Answer 1

The Linear speed of the CD is : 30.16 m/s

Given data :

Angular speed = 4800 RPM

Diameter of CD ( D )= 120 mm  ≈ 0.12 m

Determine the Linear speed of the CD

applying the equation : v = ( π DN ) / 60 m/s

Linear speed ( V ) = ( π * D * N ) / 60 m/s

                              = ( π * 0.12 * 4800 ) / 60

                              = 30.16 m/s

Hence we can conclude that the linear speed of the CD is : 30.16 m/s

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