Question

ip playing a cd the record in an old-fashioned record player always rotates at the same angular speed. with cds, the situation is different. for a cd to play properly, the point on the cd where the laser beam shines must have a linear speed \\(v_t = 1.28\text{ m/s}\\), as indicated in the figure.

part c
find the angular speed of a cd when the laser beam is \\(2.50\text{ cm}\\) from its center.
\\(\omega =\\) \\(\text{rad/s}\\)

Explanation:

Convert the radius to SI units

Using the Unit Conversion knowledge point

$$
LATEXBLOCK0
$$

Calculate the angular speed

Using the Rolling Motion Relations knowledge point

$$
LATEXBLOCK1
$$

Answer:

Find the angular speed of a CD when the laser beam is 2.50 cm from its center.
\(\omega =\) <blank>\(51.2\)</blank> rad/s