- #1
kitsh
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Homework Statement
A massless stick of length d, held parallel to the ground, has a mass, m, attached at one end of it and a pivot on the other end. A second mass, m, is glued on at a distance x from the pivot. At what distance x would maximize the angular acceleration of the stick the instant it is released.
Homework Equations
F=Ma
Τ=Iα=RxF
a=αR
The Attempt at a Solution
I found the center of mass position, R, to be x+(d-x)/2 and F=2mg.
With some algebra I found that Τ=2m(x+(d-x)/2)²α=2mg(x+(d-x)/2)
Then solving for α, I found α=g/(x+(d-x)/2) and to maximize I would have to take the derivative with respect to x and set it equal to zero.
I believe this work to be right but my friend brought up the fact there would be a tensile force in the stick and I don't know how that would affect the equations if it would at all.