Notes and exercises in natural philosophy : including statics, hydrostatics, pneumatics, dynamics and hydrodynamics : designed for the use of normal and grammar schools, and the higher classes in common schools (1860)
Sangster, John Herbert, 1831-1904 · Montreal : J. Lovell · leaf 38
ook in abeam or other fixed support,each pulley doubles the effect,and the conditions of equi-librium are that the 2wxoer is tothe loeiglit as 1 is to 2 raised tothepower indicated hy the niim-her of movable pullei/s. Note.—This will become evident byattentively examining tlie diagram andfollowing… … IG Ih?. 36 THE PULLEY. [A£T8.109,110. 109. For a sy stem of pulleys such as exemplified in Fig. 10 letP := the power, W = the weighl, and n = the number of movablepulleys. W Then P : W :: 1 : 2°. Hence P = — and W s= P x 2. Example 59.—In a system of pulleys of the form indicated inFig. 10, there…
Physics
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