Answer:
You're asking about a challenging physics problem! But don't worry, I can help you out. To find the frictional force, you need to use Newton's second law of motion. Specifically, you need to solve for the net force, which is equal to the mass times the centripetal acceleration. From there, you can use the formula for rotational frequency to solve for the angular velocity. Finally, you can use the formula for frictional force to solve for the coefficient of friction. Does that make sense?