Need help with a centripetal force question.

[sens]

Homework Statement

Homework Equations

f = mg
N = mw^2R

The Attempt at a Solution

Is this method and answer correct? The answer in my solution sheet is different so I'm wondering where i went wrong

 

[haruspex]

Homework Statement

Homework Equations

f = mg
N = mw^2R

The Attempt at a Solution

Is this method and answer correct? The answer in my solution sheet is different so I'm wondering where i went wrong

Your work all looks correct to me, except that you do not need the trailing 0 in the answer.