I cant seem to get this angular velocity problem right

[xxxixpats]

A small rubber wheel (radius of 2.60 cm) is used to drive a large pottery wheel (radius of 33.00 cm), and they are mounted so that their circular edges touch. If the small wheel accelerates at the rate of 7.10 rad/s2, and there is no slipping, what is the angular acceleration of the large pottery wheel?

I answer this and it came out to .6 rad/s^2

Then the second part of the equation says

In the above problem, what is the time taken for the pottery wheel to reach the required speed of 72 rpm?

I simply used the equation

w=w₀+at
- W₀ would cancle leaving the formula

W=at

72RPM = 7.54 rad/s

7.54/.6 = 12.5667 s

This seems right but it keeps telling me I am wrong

 

[K^2]

Your angular acceleration is a little off. How many significant figures do you actually need?

 

[xxxixpats]

not really sure all it posted was 1, I redid the problem and got it write