Outlines of Natural Philosophy: Being the Heads of a Course of Lectures, Delivered in Columbia College, New-York, Bände 1-2C.S. Van Winkle, 1822 |
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Outlines of Natural Philosophy: Being the Heads of a Course of Lectures ... James Renwick Keine Leseprobe verfügbar - 2016 |
Häufige Begriffe und Wortgruppen
action air pump altitude angle appears applied atmosphere attraction axis ball barometer barrel BIOT body calculated called cannon pinion catskin cause centre of gravity circle circular conductor consequence constructed contrived cycloid cylinder DELAMBRE density diameter direction discharge distance earth eclipse ecliptic effect elastic electricity employed equal equator equilibrium experiments fluid force friction frustum glass greater heat hence horizontal hour angle Hydrometer inclined inclined plane increased instrument latitude length lens less liquid longitude machine magnetic means measure mercury meridian metallic moon motion moving observed orbit orifice oscillation parallax parallel particles pass pendulum perpendicular phenomena pipe piston plane plate PLAYFAIR POISSON pole portion pressure principle produced quantity rays refraction resinous resistance right ascension rise solid sound specific gravity square stars steam substances surface temperature thermometer tion trade winds tricity tube valve velocity vertical vessel vibrations vitreous weight wheel wind
Beliebte Passagen
Seite 56 - The product of the mass of a body into the square of its velocity is what has been called the Vis Viva of the body.
Seite 90 - ... be necessary to include among the forces the resistances exercised by the curves or surfaces. As a corollary, we may deduce from the above proposition, that the motion of the centre of gravity of a system of bodies will be uniform and rectilineal, whenever no accelerating force affects the system, except the mutual action of the several bodies upon each other. This will be true, whether the mutual action be produced by an attractive or a repulsive force, or by actual collision. See § 216.
Seite 64 - ... observed that this investigation, as well as the inverse problem for the case of rectilinear motion in the preceding section, is conducted more analytically than the greater part of the Principia, the reasoning of the demonstration conducting to the solution and not following it synthetically. A is the height from which a body must fall to acquire the velocity at any point D, which the given body moving in the trajectory VIK (sought by the investigation) has at the corresponding point I ; DI,...
Seite 61 - ... governs the variation of the "sun's attraction from point to point of such orbit ; but beyond this orbit it proves nothing. It remains, therefore, to show from the planetary motions round the sun, and from the motions of the satellites round their primaries, that the same law of attraction by which the intensity decreases as the square of the distance from the " centre of attraction increases, and vice versa., is universal.
Seite 7 - In experimental philosophy, propositions collected from the phenomena by induction, are to be deemed {notwithstanding contrary hypotheses) either exactly, or very nearly true, till other phenomena occur, by which they may be rendered more accurate, or liable to exception.
Seite 26 - There is an equilibrium upon the wheel and axle when the power is to the weight as the radius of the axle to the radius of the wheel.
Seite 70 - For since the time of vibration is to the time of descent through half the length of the pendulum, as the circumference of a circle to its diameter, that is, as 3.14159 to 1?
Seite 57 - B (b'— b) ; and since a + a' = b' + b, [75] therefore A (a* — of*) = B (6'1 + 6Z), or A a* + B b1 — A a'* + B 6". ' See another demonstration, Maclaurin's Account of Newton's Discoveries, Book ii. chap. iv. § 12. ' 77. If between two unequal elastic bodies A and C, a third B be interposed;, and if the least A, be made to strike with any given velocity on B, the motion communicated to C will be the greatest possible, when B is a mean proportional between A and C. It is easily shewn from §...
Seite 15 - The moment of a force about any point is the product of the force into the perpendicular let fall from that point on the direction of the force. The point is called the origin of moments. The moment of a force measures the tendency of the force to produce rotatory motion about a fixed point. 31. PROP.
Seite 66 - ... as the height of the plane is to its length, or as the thickness of the head of the wedge is to the length of the slanting side. The only difference will be in the greater friction, and difficulty in moving the plane or wedge instead of the weight. A common wedge is two inclined planes placed together, as the dotted line in figure 32 represents. Therefore...