56 Figure 20-33 gives the force magnitude F versus stretch distance x for a rubber band, with the scale of the F axis set by Fs  1.50 N and the scale of the x axis set by xs  3.50 cm. The temperature is 2.00°C.When the rubber band is stretched by x  1.70 cm, at what rate does the entropy of the rub- ber band change during a small addi- tional stretch?