- #1
BubblesAreUs
- 43
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Homework Statement
Suppose we have a rope of length L and total mass M. Suppose we x its ends at points
(xA; yA) and (xB; yB). We want to determine the shape the rope makes, hanging under the
influence of gravity. The rope is motionless, with a shape parametrised by y(x) or equivalently,
x(y), where x denotes the horizontal coordinate and y the vertical one. We are looking for the
shape which minimises the potential energy of the rope.Image below
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Homework Equations
I'm guessing
ds = sqrt ( dx^2 + dy^2) can be used.
The Attempt at a Solution
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Integrate ds over s, and thus it is...
integral ds = S [ from Yb to Ya]
Xb and Xa would be zero as the horizontal length does not change.
As you can see...I'm a bit confused. I don't know how to parametise dx and dy, or can I just use a polar coordinate system?