 ED, by acting along the whole length of the plane, CD ; and if the plane be twice as long as it is high, one pound at B, acting over the pulley, D, would balance two pounds at A, or any where on the plane • and so of all other quantities and proportions.  Knowledge for the People, Or The Plain why and Because - 第 31 頁John Timbs 著 - 1832完整檢視 - 關於此書
 | Neil Arnott - 1827 - 692 頁
...balance two pounds at a, or any where on the plane : and so of all other quantities and proportions. A horse drawing on a road where there is a rise of one foot in twenty, is really lifting onetwentieth of the load, as well as over-coming the friction and other resistance. Hence the importance... | |
 | Charles Knight - 1831 - 324 頁
...main point, as in a vehicle for travelling. Why should a road up a very steep hill, be made to wind or zig-zag all the way ? Because, to reach a given...longer. Why is it important to make roads as level as possiblc? Because, a horse drawing on a road where there is a rise of one foot in twenty, is really... | |
 | John Timbs - 1832 - 314 頁
...main point, as in a vehicle for travelling. Why should a road up a very tteep hitt, be made to wind or zig-zag all the way ? Because, to reach a given...greater, exactly as the road is made longer. Why is ti important to make roads as level as possible? Because, a horse drawing on a road where there ia... | |
 | Leonard Dunnell Gale - 1838 - 308 頁
...balQ», ance 3 pounds any where on the " plane cd, and so of all other qualities and proportions. 3. A horse drawing on a road where there is a rise of...one foot in twenty is really lifting one twentieth part of the whole load besides overcoming the friction and other resistance of the carriage ; hence,... | |
 | Neil Arnott - 1838 - 596 頁
...quantities and proportions, as already explained under the head of "Resolution of forces,"at page 99. ^ A horse drawing on a road where there is a rise of one foot in twenty, is really lifting one-twentieth of the load, as weft as overcoming the friction and other resistance of the carriage.... | |
 | Neil Arnott - 1841 - 560 頁
...quantities and proportions, as already explained under the head of " Resolution of forces," at page 69. A horse drawing on a road where there is a rise of one foot in twenty, is really lifting one-twentieth of the load, as well as overcoming the friction and other resistance of the carriage.... | |
 | Samuel Griswold Goodrich - 1844 - 370 頁
...balance two pounds at A, or any where on the plane ; and so of all other quantities and proportions. A horse drawing on a road where there is a rise of...foot in twenty, is really lifting one twentieth of his load, as well as overcoming the friction and other resistance of the carriage. Hence the importance... | |
 | Samuel Griswold Goodrich - 1844 - 344 頁
...balance two pounds at A, or any where on the plane ; and so of all other quantities and proportions. A horse drawing on a road where there is a rise of...foot in twenty, is really lifting one twentieth of his load, as well as overcoming the friction and other resistance of the carriage. Hence the importance... | |
 | John Thomas Crossley - 1845 - 336 頁
...balance two pounds at a, or any whereon the plane; and so of all other quantities and "proportions. A horse drawing on a road where there is a rise of...one twentieth of the load, as well as overcoming the 8 friction and other resistance of the carriage. Hence the importance of making roads as level as possible.... | |
 | Neil Arnott - 1845 - 532 頁
...quantities and proportions, as already explained under the head of " Resolution of forces," at page 86. A horse drawing on a road where there is a rise of one foot in twenty, is realy lifting one-twentieth of the load, as well as overcoming the friction and other resistance of... | |
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