in a CD player, a laser beam reads the information off of the disk as the disk r
ID: 1364248 • Letter: I
Question
in a CD player, a laser beam reads the information off of the disk as the disk rotates. As the laser beam moves across the disk, the tangential velocity of the disk just below the laser beam always stays the same. (This is different from a record player where the angular velocity always stays the same, like 33.3 revolutions/minute). If the angular velocity of the disk is 0J when the laser beam is at the outside edge of the disk, what is the angular velocity of the disk when the laser beam is halfway between the outside edge of the disk and the axis of rotation? Please show work. Thank you.
Explanation / Answer
Question seems to be inconsistent as the unit of angular velocity is not correct.
By the way concept goes like this:
As per the information provided angular velocity=0
Therefore, tangential velocity= angular velocity * radius.
Therefore tangential velocity = 0* R =0
As the angular velocity remains the same wherever the laser beam goes therefore angular velocity at R/2 is also equal to zero.
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