Drawbridge

Question:

(Part B figure) The drawbridge then starts to rise. The dancer continues to stand on one leg. The drawbridge stops just at the point where the dancer is on the vergeof slipping. What is the magnitude f of the frictional force now?
Express your answer in terms of some or all of the variables n, mu_s, and/or mu_k. The angle theta should not appear in your answer.

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