Edit to Tangential Accelerationmissing point

[Saladsamurai]

Homework Statement

If a car drives around a race track constructed such that two arcs of radius A=80m and Radius B=40m are joined by two stretches of straight track at a constant speed of 50 m/s, what is the ratio of the tangential accelerations A to B...Meaning asking for the ratio of the Tangential Acceleration around arc of radius A (80m) to that of the Tangential Acceleration around arc of radius B (40m). Also it is multiple choice. a.)1/2...b.)1/4...c.)2...d.)4...or e.)both equal 0.

Homework Equations

The Attempt at a Solution

I know this is much easier than I am making it. I know that A_t=r*alpha...but I do not have alpha and I am a little confused to how to calculate it? Just a hint to get me going?

 

[Saladsamurai]

I know that if linear acceleration is the change in linear velocity, then there is no change in this instance. Therefore a=0--->alpha 0...is this correct? Because alpha=a/r.

 

[hage567]

If you are just looking at the tangential component of the total acceleration, then I would say you are right.

 

[Saladsamurai]

Yes. It is just the Tangential component. So that does look right.