Martin, Louis Adolphe, 1880- · New York, J.Wiley & Sons, Inc.: [etc. etc.] · leaf 31
s 10 feet and whose strength is 10 pounds per foot, to a length of 13 feet. In Fig. 12 (a) let X represent a stretched length of the spring; its deforma- FiG. 12 tion is then (x — 10) feet and the force, F, required to keep it stretched to this length is (x — 10) (10) pounds. The work done in… … WORK AND ENERGY 15 tion by considering the average value of the variableforce. Thus the force applied at the beginning of the elonga-tion is o pounds and at the end 30 pounds, and as it in-creases directly with the elongation the average tension is ^ or 15 pounds, and the work done equals (aver- 2…
Mechanics
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