An elementary treatise on mechanics, embracing the theory of statics and dynamics, and its applications to solids and fluids (1849)
Smith, Augustus William, 1802-1866 · New York, Harper · leaf 142
CD By the principle of virtual velocities, p.pp-w.ww=o, 118 STATICS. ^.-.arcDjD T__ .,_. arc D2D rtor P.AC.—^ W.CB. CD2 =0, ^AC TxrCB W AC CD , . W CD % p=^cC7D; n =BC> p =(XD as found in Art. 143. 193. Prop. 77«e principle of virtual velocities obtains in thesingle movable pulley with parallel… … If the pulley A be raised to A,we shall have AA=WW=£PP,since each of the cords passinground Jhe pulley A must be short-ened by a length =WW. WW,the virtual velocity of W, is nega-tive. .-. P.PP-W.WW=0,or P.PF-W.1PF=0. WHence -p-=2, as found in Art. 158. 194. Prop. The principle of virtual…
Mechanics, Analytic
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