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Not calc based! tangential and angular acceleration

  • #1

Homework Statement


a disk rotates with constant angular accel. the initial angular speed of the disc is 2pie rad/s. After the disk rotates through 10pie rad, the ang speed is 7pie rad/s.

Homework Equations


a. what is the mag of the angular accel?


The Attempt at a Solution


alpha=delta omega/delta time
omega=delta theta/delta time
etiher or both?
 

Answers and Replies

  • #2
PhanthomJay
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Homework Statement


a disk rotates with constant angular accel. the initial angular speed of the disc is 2pie rad/s. After the disk rotates through 10pie rad, the ang speed is 7pie rad/s.

Homework Equations


a. what is the mag of the angular accel?


The Attempt at a Solution


alpha=delta omega/delta time
omega=delta theta/delta time
etiher or both?
the first one has 2 unknowns and the second one is wrong...why not try one of the other kinematic equations for constant angular acceleration.....the one that relates omega with alpha and theta?
 
  • #3
i have no idea! HELLLP
 
  • #4
PhanthomJay
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i have no idea! HELLLP
Well you seem to have known somehow that alpha=delta omega/delta time, how did you know that? You can find the equations on the link below, 4th slide:

http://www.colorado.edu/physics/phys2010/phys2010_fa11/LectureNotes/phys2010_fa11_lecture28.pdf [Broken]

You should first learn, understand, and memorize the motion equations for translational motion.
 
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