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Simple Pendulum period

1. Homework Statement
A pendulum has a period of 1.8 s.


2. Homework Equations
Its length is doubled. What is its period now?

The original pendulum is taken to a planet where g = 16 m/s2.
What is its period on that planet?



3. The Attempt at a Solution
T=2pi sqrt(L/g)
1.8=2pi sqrt(2L/g)



I dont what Im suppose to solve for. This looks like a very simple problem, but i cant seem to figure it out. Maybe i'm over thinking it.
 

LowlyPion

Homework Helper
3,079
4
1. Homework Statement
A pendulum has a period of 1.8 s.

2. Homework Equations
Its length is doubled. What is its period now?

The original pendulum is taken to a planet where g = 16 m/s2.
What is its period on that planet?

3. The Attempt at a Solution
T=2pi sqrt(L/g)
1.8=2pi sqrt(2L/g)

I dont what Im suppose to solve for. This looks like a very simple problem, but i cant seem to figure it out. Maybe i'm over thinking it.
Well your equations are almost right, but they asked what happens to T when you double L. Presumably 1.8 s is what it is when l = L and they want to know what T is when l = 2L.
 
What is I?...if the length is doubled, shouldn't the time increase? but how would i interpret that on paper with the given equation?
 

LowlyPion

Homework Helper
3,079
4
What is I?...if the length is doubled, shouldn't the time increase? but how would i interpret that on paper with the given equation?
Not I, little L.

The variable l, in the equation you wrote

T = 2π (g/l)1/2
 

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