Angular Acceleration: A compact disc (CD), initially at rest, reaches an angular speed of 50 rad/s in 4.5 seconds. What is the magnitude of its angular acceleration? How many revolutions does the CD make in 8.0 s?
Added by Nancy B.
Step 1
5 s Plugging in the values, we get: alpha = (50 rad/s - 0 rad/s) / 4.5 s alpha = 50 rad/s / 4.5 s alpha = 11.11 rad/s^2 Show more…
Show all steps
Your feedback will help us improve your experience
Adi S and 57 other Physics 101 Mechanics educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
A CD originally at rest reaches an angular speed of $40 \mathrm{rad} / \mathrm{s}$ in $5.0 \mathrm{~s}$. (a) What is the magnitude of its angular acceleration? (b) How many revolutions does the CD make in the $5.0 \mathrm{~s} ?$
A compact disc (CD) is known to have a constant angular acceleration of 40 rad/s^2. If it starts from rest, (a) what is its angular displacement after 10 seconds? (b) How many times does the CD have made complete revolutions?
Sikandar B.
Starting from rest, a disk rotates about its central axis with constant angular acceleration. In 5.0 s, it rotates 25 rad. During that time, what are the magnitudes of (a) the angular acceleration and (b) the average angular velocity? (c) What is the instantaneous angular velocity of the disk at the end of the 5.0 $\mathrm{s} ?(\mathrm{d})$ With the angular acceleration unchanged, through what additional angle will the disk turn during the next 5.0 $\mathrm{s}$ ?
Recommended Textbooks
University Physics with Modern Physics
Physics: Principles with Applications
Fundamentals of Physics
Transcript
Watch the video solution with this free unlock.
EMAIL
PASSWORD