Calculating Length of Pendulum with 12.0 N Weight and 1.2 s Swing

[Jtappan]

Homework Statement

A clock has a pendulum that performs one full swing every 1.2 s (back and forth). The object at the end of the pendulum weighs 12.0 N. What is the length of the pendulum?
____ m

Homework Equations

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The Attempt at a Solution

What is the equation i would use here?

 

[amolv06]

http://www.google.com/search?source=ig&hl=en&rlz=&q=period+of+a+pendulum&btnG=Google+Search

 

[ogb p]

There are two equations that can be used to calculate the length of a pendulum:
1) T = 2π√(L/g), where T is the period (in seconds), L is the length of the pendulum (in meters), and g is the acceleration due to gravity (9.8 m/s^2).
2) T = 1/f, where T is the period (in seconds) and f is the frequency (in hertz).

Using the first equation, we can rearrange it to solve for L:
L = (T/2π)^2 * g

Plugging in the given values, we get:
L = (1.2 s/2π)^2 * 9.8 m/s^2 = 0.58 m

Therefore, the length of the pendulum is approximately 0.58 meters.