How Is Angular Speed Calculated for a Chain Saw Sprocket?

[wallace13]

The drawing (attached) shows the blade of a chain saw. The rotating sprocket tip at the end of the guide bar has a radius of 3.8 10-2 m. The linear speed of a chain link at point A is 6.5 m/s. Find the angular speed of the sprocket tip in rev/s.


Vt= w/r


6.5= w/ .038

w=.247 rev/ sec

.247 was incorrect and I am unsure of what I am missing from my equation

 

[glueball8]

hmm your formula is wrong

$$V=\omega \times R$$