Examples8.3 - 1 Example 1. Let F be a conservative vector...

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Unformatted text preview: 1 Example 1. Let F be a conservative vector field in the plane. In the Figure, suppose that in the integral of F along AOF is 3, along OF is 2, and along AB is −5. Compute the integral of F along the path BOEF. y A F O B E x C D Solution. Since F is conservative, the line integral depends only on the endpoints. Thus, we can take the path BAOF instead. The integral along BAOF = (integral along BA) + (integral along AOF) = −(−5) + 3 = 8. ♦ Example 2. Suppose that the kinetic energy of a particle that moves in a circular path under the influence a force field F according to Newton’s second law (that is, F = ma) increases after the particle makes one circuit. Can the force field governing the particle’s motion be conservative? Solution. No. If the force field F(r) is conservative, then F · ds = (Energy at start) − (Energy at finish) = 0, C which is a contradiction. ...
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This note was uploaded on 07/19/2010 for the course MA 1C taught by Professor Ramakrishnan during the Spring '08 term at Caltech.

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