Well's natural philosophy : for the use of schools, academies and privte students, introducing the latest results of scientific discovery and research ; arranged with special reference to the practical application of physical science to the arts and the experiences of everyday life ; with three hundred and seventy-five engravings (1873)
Wells, David A · New York : Ivison, Blakeman, Taylor and Co. · leaf 100
fingers applied at c.When a man raises a ladder against a wall, heemploys a lever of the third class; the fulcrumbeing the foot of the ladder resting upon theground, the power being the hands applied toraise it, and the resistance being the weight of the ladder. 206. In levers of the third class,… … What is the re-lation betireenthe power andthe weight inlevers of thethird class f Thus (in No. 3, Fig. 01), if the length from the point where the weight, W,is suspended to F bo three times the length of P F, then a weight of 100pounds suspended at W will require a power of 300 applied at P to…
Physics · Science · Technology
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