A text book of elementary mechanics, for the use of colleges and schools (1881)
Dana, Edward Salisbury, 1849-1935 · New York, J. Wiley & sons · leaf 251
s a. 4. ifyrstf #z/s^w of Pulleys. Suppose that the weight(Fig. 172) is raised through aheight //, the wheel D is evidentlyraised %h\ the wheel C, 27*; thewheel B, 27/; the wheel A, 2*h;consequently the power P mustact through a distance s = 2*h;that is, W.h = 27*. P, and W =25.P; or, in general,… … 226.1 PULLEY. 233 must act is equal to 6A. Hence P.6h = W.hy and W— 6P; or, in general, TT = nP. 6. Third System of Pulleys. Suppose that the weightis raised (Fig. 174) a height/*; then, since the pulleyD is fixed, the pulley C will on this account move downa distance h; but, since the point c also…
Mechanics
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