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## Homework Statement

Imagine a pendulum which consists of a particle like bob of mass m suspended by a massless string of length L. Using the following equation

[tex]T=2 \pi \sqrt{\frac{L}{g}}[/tex]

given the mass of the bob is 100 g, what is the length of the pendulum supposed to be if we want its period to be 2 seconds?

## The Attempt at a Solution

So do I need to substitute g=9.81 or do I need to use the mass to find a new value for g? Is the follwoing correct:

[tex]2=2 \pi \sqrt{\frac{L}{9.81}}[/tex]

[tex]L=1[/tex]

I didn't even need to use m=100! Then why did they give us the value for mass if it was useless? am I missing something?