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Find the rotational frequency of the wheel that will produce this effect.

(answer in units of rpm)

2. v^2=gr, w=v/r, w/2pi = frequency

3. To find velocity I used v^2=gr. I know that w=v/r so with my found velocity I divided it by the radius (62). to find the frequency=> w/2pi = frequency. I must be missing a step because the answer I got is wrong. Help would be fancied. thank you!