# Angular velocity help?

1. Dec 14, 2009

### sirfinklstin

1. The problem statement, all variables and given/known data

Consider the conical pendulum, a mass on the end of a string, with the other end of the string fixed to the ceiling. Given the proper push, this pendulum can swing in a circle at an angle theta of 25.5 degrees with respect to the vertical, maintaining the same height throughout its motion. If the mass of the pendulum M is 14.6 kg and the length of the string L is 0.5 m, what is the speed of the mass as it swings?

2. Relevant equations
v = (coefficient of static friction x Rg)^1/2.
R = .215 m

I am not sure how to find the coefficient of static friction here, any help is appreciated.

2. Dec 14, 2009

### Staff: Mentor

Why would friction be involved in a pendulum problem?

3. Dec 14, 2009

### sirfinklstin

The friction was part of an equation in my physics book, but if you have another equation that would be great.

4. Dec 14, 2009

### Staff: Mentor

A friction term in a simple pendulum equation? Could you please post the equation and the description of the equation?

I believe that traditional pendulums are considered to have a frictionless pivot...

http://en.wikipedia.org/wiki/Pendulum

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