Figure gives the force magnitude F versus stretch distance x for a rubber band, with the scale of the F axis set by F = 1.50 N and the scale of the x axis set by xs = 3.50 cm. The temperature is 2.00oC. When the rubber band is stretched by x = 1.70 cm, at what rate does the entropy of the rubber band change during a small additional stretch?

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Situation (a) (b) (d) (c) 400 450 0.300 0.300 1.20 1.20 350 0.200 Temperature (K) Initial volume (cm') Final volume (cm') 250 0.200 0.800 0.800