Physics: A CD is spinning on a CD player. In 220 radians, the cd has reached an angular speed of 92 r a d s by accelerating with a constant acceleration of 14 r a d s 2 . What was the initial angular speed of the CD

A CD is spinning on a CD player. In 220 radians, the

Ответ:

keilyn80

29.01.2022

Physics

The initial angular speed is $w_i = 48 \ rad/s$

Explanation:

From the question we are told that

The angular displacement is $\theta = 220 \ rad$

The angular speed is $w_f = 92 \ rad/s$

The acceleration is $\alpha = 14 \ rad/s^2$

Generally the initial angular speed can be evaluated as

$w_f ^2 = w_i ^2 + 2 * \alpha * \theta$

=> $w_i ^2 = w_f ^2 - 2 * \alpha * \theta$

substituting values

=> w_i ^2 = 92 ^2 - 2 * 14 * 220

=> w_i ^2 = 2304

=> $w_i = 48 \ rad/s$

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Ответ:

tink921

21.12.2021

Physics

Five examples of compressional waves are:
1. sound waves.
2. longitudinal waves produced on a slinky by stretching and compressing it.
3. seismic p-waves (created by earthquakes and explosions.
4. glass vibrations.
5. spring oscillations.

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A CD is spinning on a CD player. In 220 radians, the cd has reached an angular speed of 92 r a d s by accelerating with a constant acceleration of 14 r a d s 2 . What was the initial angular speed of the CD

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