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 (1861)
Sangster, John Herbert, 1831-1904 · Montreal : J. Lovell · leaf 38
a hook in abeam or other fixed support,each pulley doubles the etfect,and the conditions of equi-librium are that thej^ower is tothe weight as\ is to 2 raised tothe power indicated hy the num-ber of movable jpulleys. Note.—This will become evident byattentively examining the diagram anilfollowing… … 16 lbs. 36 THE PULLEY. Abts. 109.110. 109. For a system of piilkys such as exemplified in Fig. 10 letP=z the power, W:=the weighty and n=z the number of movablepulleys. W Then P : W : : I : 2^. HenceP— — and W=P X 2». Example 59.—In a system of pulleys of the form indicated inFig. 10, there are 5…
Physics
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