A dvd is 12 centimeters in diameter. the drive motor of the dvd player rotates betwe 200 and 500 revolut per minute, depending on what track is being read.
a) find an interval for the angular speed
b) find an interval for the linear speed
a) angular speed=RPM*2πrrad/min
=RPM*2π(12/2)/60 rad/ sec
Angular speed=200*π/5=40π=125.6 rad/sec
Angular speed=500*π/5=100π=314.15 rad/sec
b) linear speed=radius* angular speed
Linear speed =125.6*(12/2)=753.6cmsec
Linear speed =314.15*(12/2)=1884.9cm/ sec
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