Question

g A CD is spinning on a CD player. You open the CD player to change out the disk and notice that the CD comes to rest after 15 revolutions with a constant deceleration of 120 r a d s 2 . What was the initial angular speed of the CD

Answer 1

`\omega_1=150rads/sec`

Step-by-step explanation:

From the question we are told that:

Number of Revolution
`N=15=30\pi`

Deceleration
`d= -120 rads/2`

Generally the equation for initial angular speed
`\omega_1` is mathematically given by

`\omega_2^2=\omega_1^2 +2(d)(N)`

`0=\omega_1^2 +2(-120)(20 \pi)`

`\omega_1^2=7200 \pi`

`\omega_1=150rads/sec`