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## Homework Statement

I need to find the phase difference between two pendulums. My problem is that I don;t seem to have enough information to calculate the phase for the second pendulum (I have already calculated the phase for the first).

The pendulum is 0.35m long, and is at 0.00rad at t=0. (the question also states that the pendulum IS swinging). I need to find the phase at 10s

## Homework Equations

θ(t)=[itex]\Theta[/itex]sin(ωt+[itex]\phi[/itex])

θ(t)=[itex]\Theta[/itex]sin([itex]\phi[/itex])

phase = ωt+[itex]\phi[/itex]

ω=[itex]\sqrt{g/l}[/itex]

[itex]\phi[/itex]=arcsin(θ(t)/[itex]\Theta[/itex])

## The Attempt at a Solution

So as I mentioned, I have calculated the phase of the first pendulum. But I can't seem to calculate the phase of the second one.

I thought there might have been a way to calculate [itex]\Theta[/itex] and then calculate [itex]\phi[/itex] using that value but can't seem to figure out exactly how!

HELP! :)