Angular, linear velocity & centripetal acceleration

[GreatEscapist]

Homework Statement

A washing machine's two spin cycles are 328 rev/min and 542 rev/min. The diameter of the drum is 0.43 m.
What is the ratio of the centripetal accelerations for the fast and slow spin cycles?

Homework Equations

a_c=v²/r
linear velocity: v=rw (w is really omega)
angular velocity= change in theta/change in time

I think that's all I need.

The Attempt at a Solution

First I changed the angular velocities from rev/min to rad/s. So, 328 rev/min=34 rad/s, and 542 rev/min=57 rad/s.
I solved for the slow cycle's acceleration first. Since it is in linear velocity instead of angular velocity, i solved for the linear velocities for the slow and fast cycle.
v=rw -> v_s=(.215 m)(34 rad/s) -> 7.31 m/s
v=rw -> v_f=(.215 m)(57 rad/s) -> 12.3 m/s
Then I plugged these into the centripetal acceleration formula for the slow and fast cycles.
a_cs=v²/r -> a=(7.31 m/s)(7.31 m/s)/(.215 m) -> 248.54 m/s²
a_cf=v²/r -> a=(12.3 m/s)(12.3 m/s)/(.215 m) -> 703.67 m/s²There may not be anything wrong with it, but those numbers for the acceleration seem soooooo big. It's easy physics, so I don't know what I'm doing wrong. >:(

 

[rock.freak667]

Yes they are correct. Both those speeds are quite high, so the centripetal accelerations are high as well.

 

[GreatEscapist]

Oh.
I did this wrong the first time I did it, and I forgot what the answers were (yay spring break)
Thanks. :P