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Homework Statement
A pendulum is made of a bob dangling from a lightweight string of length ℓ. The bob is pulled sideways so that the string makes an angle θi with respect to the vertical, then released.
As it swings down, what is the rotational speed of the bob as a function of the changing angle θ? Use the notation l for the length of the string ℓ.
Express your answer in terms of the the variables m, l, θ, θi, and acceleration due to gravity g.
Homework Equations
h = l(cosθ - cosθi)
v=(2gh)^1/2
w = v/l
The Attempt at a Solution
I got w = ((2ghl(cosθ - cosθi))^(1/2))/l , but that was not correct. Are my equations wrong? Thanks