Calculus 2 Lecture Notes, Section 9.3
7. Find the arc length of the curve . Solution. According to the formula for arc length we have. Let. Then whence and, because , we have. Therefore . 8. A force of 30 N is required to maintain a spring stretched from its natural length of 12 cm to a length of 15 cm. How much work is done in stretching the spring from 12 cm to 20 cm? Solution. ................
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