DVDs hold approximately seven times more information and spin faster than CDs . The angular speed of
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DVDs hold approximately seven times more information and spin faster than CDs The angular speed of a DVD at the outer position, Point A in the image below, goes at RPM when it is being read. Just like the CD the "read head" passes the same length at all times and radii meaning the constant linear velocity CLV is why a DVD spins at various angular speeds. The information on these pits is read by lasers and is contained between cm Point B and cm Point A along a radial line.
a What is the tangential speed of any point on the DVD when it is being read by the laser?
b What is the angular speed when the inner position Point B is being read by the laser?
c If the DVD starts being read on the outside at Point A and is read continuously to the inside at Point B what is the magnitude of the average angular acceleration of the DVD
d If the DVD rotates times while it is being read, what is the running time of this movie?
e What is the average spacing between the lines of information?
f What is the tangential speed of the outer position at Point A when the laser is reading the inner position at Point B
g What is the average tangential acceleration of the outer position at Point A during the playing of the DVD
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