How to Determine Angular Acceleration from Given Equations?

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To determine angular acceleration from the given equations, the discussion focuses on the equation a=[r''-r0'^2]er+[r0'' + 2r'0']e0, where θ represents the angular position. The user expresses confusion about how to apply the equation effectively, having attempted to substitute values without clear direction. They seek guidance on how to relate the car's constant velocity to the variables x, θ, and \dot{θ} over time. The conversation emphasizes the need for a structured approach to solving the problem rather than random substitutions. Understanding the relationship between linear and angular motion is crucial for finding the solution.
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Homework Statement


http://imageshack.us/photo/my-images/855/10544781.png/


Homework Equations


a=[r''-r0'^2]er+[r0'' + 2r'0']e0 where 0 = theta


The Attempt at a Solution


stumped about it, I've tried setting the above to 0 then work out r which is 200 m but that's just cluelessly subbing values into the equation, any directions as to where to head? thanks!
 
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The car moves along the road with constant velocity v. Find x as function of time. Find how θ and \dot {\theta} are related to v and time.

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