Question

Let's begin with the angular acceleration of a compact disk (CD). To play music the CD must rotate at high speed while a laser reads data encoded in a spiral pattern on the disk. The disc has radius R=6.0cm=0.060m; when data are being read, it spins at 7200 rev/min. What is the CD's angular velocity ω in radians per second? How much time is required for it to rotate through 90∘? If it starts from rest and reaches full speed in 4.0 s, what is its average angular acceleration? An old-fashioned vinyl record is designed to turn at 33 rev/min. Find the average angular velocity. Find the angular acceleration of the record if it spins through four full rotations before coming to a stop when the record player is turned off.

          Let's begin with the angular acceleration of a compact disk
(CD). To play music the CD must rotate at high speed while a laser
reads data encoded in a spiral pattern on the disk. The disc has
radius R=6.0cm=0.060m; when data are being read, it spins at 7200
rev/min. What is the CD's angular velocity ω in radians per second?
How much time is required for it to rotate through 90∘? If it
starts from rest and reaches full speed in 4.0 s, what is its
average angular acceleration?
An old-fashioned vinyl record is designed to turn at 33 rev/min.
Find the average angular velocity.
Find the angular acceleration of the record if it spins through
four full rotations before coming to a stop when the record player
is turned off.

Added by David P.

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