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" Definition of Pulley. Prop. 11. In the single moveable pulley where the strings are parallel, there is an equilibrium when the power is to the weight as 1 to 2. Prop. 12. In a system in which the same string passes round any number of pulleys and the... "
The Cambridge course of elementary natural philosophy, being the ... - Σελίδα iv
των John Charles Snowball - 1838 - 81 σελίδες
Πλήρης προβολή - Σχετικά με αυτό το βιβλίο

The Principles of Mechanics: Designed for the Use of Students in the University

James Wood - 1818 - 211 σελίδες
...the radius ; in this case, the power : the pressure :: 1 : 2. PROP. XXII. (108.) In a system where the same string passes round any number of pulleys,...the parts of it between the pulleys are parallel, P : W :: 1 : the number of strings at the lower block. Since the parallel parts, or strings at the...

The Christian remembrancer; or, The Churchman's Biblical ..., Τόμος 22

1840
...where the strings are parallel, there is an equilihrium when the power is to the weight as 1 to 2. Prop. 12. In a system in which the same string passes round any numher of pulleys and the parts of it hetween the pulleys are parallel, there is an equilihrium when...

The Mechanical Euclid: Containing the Elements of Mechanics and Hydrostatics ...

William Whewell - 1837 - 182 σελίδες
...equilibrium : therefore, in the case of equilibrium, W is double of P, or P : W :: 1 : 2. * PftOP. XVIII. In a system in which the same string passes round...(W) :: 1 : the number of strings at the lower block. Let AC represent the system of pulleys; the string ABCDEFGH K passing round all the A pulleys, and...

The examinations for the degree of bachelor of arts, Jan., 1847

Cambridge univ, exam. papers - 1847 - 80 σελίδες
...rest. Is it possible for three forces represented by the numbers 1, 4, 7 to keep a point at rest? 4. In a system in which the same string passes round any number of pullies, and the parts of it between the pullies are parallel, there is equilibrium when W=-P x number...

Register

University of Cambridge - 1849
...where the strings are parallel, there is an equilibrium when the power is to the weight as 1 to 2. Prop. 12. In a system in which the same string passes round any num. ber of pulleys, and the parts of it between the pulleys are parallel, there is an equuibrium when...

Cambridge examination papers: a suppl. to the University calendar, 1856-59

Cambridge univ, exam. papers - 1856
...in magnitude and direction by the sides of a triangle, act on a point, they will keep it at rest. 4. In a system in which the same string passes round...pulleys are parallel, there is an equilibrium when P : W :: l : the number of strings at the lower block. If the number of strings at the lower block...

Cambridge examination papers: a suppl. to the University calendar, 1856-59

Cambridge univ, exam. papers - 1856
...other position of the lever. Why does this proposition not apply to the case of the Common Balance? 5. In a system in which the same string passes round...parts of it between the pulleys are parallel, there is equilibrium, when P : W:: 1 : n, where n is the number of strings at the lower block. Shew the advantages...

The Principles and practise of operative surgery

Frederic Carpenter Skey - 1858 - 736 σελίδες
...moment's * It ii well to be aware of the actual amount of force which we employ in any given cane. When the same string passes round any number of pulleys, and the parts of it beween the pulleys are parallel —as in the apparatus commonly nsed for the reduction of dislocations...

Register

University of Cambridge - 1864
...where the strings are parallel, there is an equilibrium when the power is to the weight as 1 to 2. Prop. 12. In a system in which the same string passes round any number of pulleys, and trie parts of it between the pulleys are parallel, there is an equilibrium when power ( P) : weight...

The Cambridge Course of Elementary Natural Philosophy: Being the ...

1864 - 179 σελίδες
...Art. 41, P : W+w :: 1 : 2, or W+v>=2P; W w and therefore the mechanical advantage is diminished. 17. In a system, in which the same string passes round any number of pulleys (Prop, XII), and the parts of it between the pulleys are parallel, if the weight of the pulleys be...




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