Natural philosophy. including statics, hydrostatics, pneumatics, dynamics, hydrodynamics, the general theory of undulations, the science of sound, the mechanical theory of music, etc. : designed for the use of normal and grammar schools, and the higher classes in common schools (1867)
Sangster, John Herbert, 1831-1904 · Montreal : Printed and published by John Lovell · leaf 38
hook in abeam or other fixed support,each pulley doubles the effect,and the conditions of equi-librium are that the •power is tothe weight as 1 is to 2 raised tothe j^oicer indicated hij the num-ber of movahlepulleys. Note.—This will become evident byattentively examiuing the diagram andIbHowing up… … 16 lbs. 86 THE PULLEY. [Arts. 109,110. 109. For a system of pulleys, such as exemplified in Fig. 10, letP =z the power J W = the ioei(jht^ and n = the number of movablepulleys. W Then P : W ;: 1 : 2n. Hence P = — and W = ? X 2°. Example 59.—In a system of pulleys of the form indicated inFig. 10,…
Physics
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