licorice could “spring back” to its original shape. Still, to the extent that Ukx=122applies, the graph is a parabola (not shown here) which has its vertex at the origin and is either concave upward or concave downward depending on how one wishes to define the sign of F(the connection being F= –dU/dx).(e) As a crude estimate, the area under the curve is roughly half the area of the entire plotting-area (8000 N by 12 mm). This leads to an approximate work of 12(8000 N) (0.012 m) ≈50 J. Estimates in the range 40 ≤W≤50 J are acceptable. (f) Certainly dissipative effects dominate this process, and we cannot assign it a meaningful potential energy. 125. (a) The compression is “spring-like” so the maximum force relates to the distance xby Hooke's law: Fk
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This note was uploaded on 05/17/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.