Angular acceleration - Please check if this is correct and

[nukeman]

Angular acceleration - Please check if this is correct and...

Homework Statement

Question:

Each of the tires of a car makes 85.0 revolutions as the car reduces its speed uniformly from 90.0 km/h to 60.0 km/m, The tires have a diamater of .900m.

Find initial and final angular Velocities

Find the angular acceleration of tires in rad/s^2

My answers: Please tell me if that's right, because I have NO idea if its correct.

Homework Equations

The Attempt at a Solution

 

[grzz]

If I am interpreting your work correctly, you are changing the km to m by multiplying by 900 instead of by 1000.

I think that the rest is OK.

 

[nukeman]

Oops lol

Where wherever I have 900, change to 1000 correct? Just to be sure :)

Because when I change that, I get -1.60 is that correct for this question?

Because someone told me they got -4.88 ?

 

[grzz]

I got angular acc = -1.605rad/sec^2.