What is Angular Acceleration and How is it Calculated in a Cycling Scenario?

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Angular Acceleration (please help)

A cyclist starts from rest and pedals so that the wheels make 7.5 revolutions in the first 4.8 seconds. What is the angular acceleration of the wheels (assumed constant)?

 

[Hootenanny]

Welcome to PF,

One is expected to so one's own efforts before asking for help. So, what is the definition of angular acceleration?

 

[physixguru]

KNOWN:

Angular velocity [omega]= velocity/radius of rotation

Initial angular velocity=0 [starts from rest]
Time=4.8 sec
angular displacement=7.5 rev*2pi radian.
Hence the equation...:

Angular displacement=0+1/2 *angular accln *time^2

Calculate angular accln.

But this was the stereotype part...you must emphasize on the theory and the concept behind the problem..
so answer the above question first...