# Period of a Pendulum

#### CivilSigma

1. The problem statement, all variables and given/known data
Pendulum A is 20 cm long and has a 5g mass on it. Pendulum B is 30 cm long and has 10g mass on it. Which one has a faster period?

2. Relevant equations

d=v1t+0.5at^2

3. The attempt at a solution

First of all, does the mass of the pendulum matter at all? and if not then it I would need to find the time in both cases and divide by 1 right?

Time Pendulum A= 0.20 s which means that the period is 0.20 s.
Time Pendulum B= 0.25 s which means that the period is o.25 s.

Am I right? Thank you in advance.

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#### rude man

Homework Helper
Gold Member
First of all, does the mass of the pendulum matter at all?

Nope.
and if not then it I would need to find the time in both cases and divide by 1 right?
???

Time Pendulum A= 0.20 s which means that the period is 0.20 s.
Time Pendulum B= 0.25 s which means that the period is o.25 s.
Whence these numbers?

Am I right? Thank you in advance.[/QUOTE]

No.
What's the formula for the period of a simple pendulum?

#### CivilSigma

I do not know because we have not learned it. >.<

#### rude man

Homework Helper
Gold Member
I do not know because we have not learned it. >.<
Then you'll have to derive it from the differential equation relating restoring torque to angular acceleration for small deviational angles.

Really it would be simpler for you to just look it up though.

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