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 247
The tension at I is P, and at a(Fig. 160) it is 2P. 220. Single Movable Pulley with Inclined Strings. It was assumed in the preceding-article that both branches of therope were parallel; if, however,they are inclined at an angle 2a1JF (Fig. 161), then W = 2P cos a. In Fig. 161 the tension of… … Fig. 161. 221. PULLEY. 229 the angle 2a, these components are equal, and each hasthe value P cos a; hence W = 2P cos a. There is evidently a mechanical disadvantage here ascompared with the preceding case, for W = 2P onlywhen a = 0°, the two strings being parallel, and Pincreases as a increases.…
Mechanics
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