Homework Help: Not calc based! tangential and angular acceleration

darlagatsch · Nov 3, 2011

1. The problem statement, all variables and given/known data
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.

2. Relevant equations
a. what is the mag of the angular accel?

3. The attempt at a solution
alpha=delta omega/delta time
omega=delta theta/delta time
etiher or both?

PhanthomJay · Nov 3, 2011

darlagatsch said: ↑

1. The problem statement, all variables and given/known data
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.

2. Relevant equations
a. what is the mag of the angular accel?

3. 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?

darlagatsch · Nov 3, 2011

i have no idea! HELLLP

PhanthomJay · Nov 3, 2011

darlagatsch said: ↑

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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Homework Help: Not calc based! tangential and angular acceleration

darlagatsch

PhanthomJay

darlagatsch

PhanthomJay