Hi there!
Centripetal acceleration can be written as:
[tex]a_c = \frac{v^2}{r}[/tex]
v = tangential velocity (m/s)
r = radius (m)
Plug in the given values:
[tex]a_c = \frac{65^2}{0.35} = \boxed{12071.43 \text{ m}/s^2}}}[/tex]
The centripetal acceleration vector ALWAYS points towards the CENTER POINT of the barrel.