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 121
THE PULLEY. 97 158. Prop. Required the relation of the power to the weight inthe single movable pulley. The tension t of the cord, being the same pthroughout, is equal to the power P; alsoto the pressure on the hook Q,. The resultant of the two tensions in thedirections CP and DQ, being equal… … 2 cos. athe same as obtained in Art. 149. Cor. 1. If the weight w of the pulley be taken into account, E=w±». 2 cos. aCor. 2. If the cords are parallel, a—Q and „ W+w Cor. 3. If a=90°, 2«=180°, or the cord becomes straightand horizontal. In this case -o W+wP=-—=«, or the power must be infinite. In…
Mechanics, Analytic
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