- #1

Thorlax402

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__Question 1:__

**In a popular amusement park ride, a rotating cylinder of radius 3.00 m is set in rotation at an angular speed of 7.00 rad/s, as in the figure displayed below. The floor then drops away, leaving the riders suspended against the wall in a vertical position. What minimum coefficient of friction between a rider's clothing and the wall is needed to keep the rider from slipping? (Hint: Recall that the magnitude of the maximum force of static friction is equal to µn, where n is the normal force - in this case, the force causing the centripetal acceleration.)**

**3. The Attempt at a Solution : 14.9847 (Obviously Wrong, way too large for a coefficient.**

Basically, my problem on this one comes down to solving for centripetal force without knowing the mass. I can easily get centripetal acceleration, but don't know where to go from there with the data given. If someone could explain how to do this that would be fantastic.

__Question 2:__

**A certain light truck can go around a flat curve having a radius of 150 m with a maximum speed of 34.0 m/s. With what maximum speed can it go around a curve having a radius of 71.0 m?**

**My answers (both wrong): 71.8310 m/s, 16.0933 m/s**

Quite frankly, I don't know what I am doing wrong on this one. For the first of my two answers, I thought I was being given angular velocity which is not the case, but the second one not only used tangential velocity like I was supposed to, but the answer makes sense and is still not right. If someone could help me on this one too it would be greatly appreciated.

Thanks in advance,

~Thorlax