Solve Dynamics Problem: Find Friction Force at θ=80° & 40°

[springo]

Homework Statement

I drew this to make it easier to understand:
http://img142.imageshack.us/img142/2729/problemagc0.th.jpg
E (mass: 400g) can move along the semicircle.
ABCD is a plate rotating around (AD) axis at constant speed (14 rad/s).
Coefficients of friction are 0.35 (static) and 0.25 (dynamic).
I need to find out whether E will move for θ = 80º and for θ = 40º. Also I need to find the module and direction of the friction force for t₀.

Homework Equations

None.

The Attempt at a Solution

I applied Newton's second law.
Σ F_ext = mg + N₁ + N₂ + f
Where:
mg is E's weight
N₁ is the normal force in the (ABC) plane
N₂ is the normal force perpendicular to the (ABC) plane
f is the friction force
I did this also so that you understand what I mean -just in case... :)
http://img88.imageshack.us/img88/4488/esquemabr8.th.jpg

Then I think I must use:
a_E = a_O + a_E/O + ωx(ωxOE) + αxOE + 2ωxv_E/O
With:
α = dω/dt = 0
ω = 14 j
OE = (0.65 - sin(θ)*0.25) iI hope you can help me out here. Thanks a lot!

 

[springo]

Bump, anyone?
Thanks again.

 

[springo]

Bump, please give me a hand...