Mathematical and Physical Papers, المجلد 1University Press, 1880 |
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الصفحة 76
... tangential action which in it is wholly neglected . In fact , accord- ing to the common theory the water ought to ... tangential force , and consequently the pressure not supposed the same in all directions , I was led to construct the ...
... tangential action which in it is wholly neglected . In fact , accord- ing to the common theory the water ought to ... tangential force , and consequently the pressure not supposed the same in all directions , I was led to construct the ...
الصفحة 85
... tangential force t „ , p „ and t , being forces of great intensity and short duration , that is being of the nature of impulsive forces . As the number of molecules comprised in the element considered has been supposed extremely great ...
... tangential force t „ , p „ and t , being forces of great intensity and short duration , that is being of the nature of impulsive forces . As the number of molecules comprised in the element considered has been supposed extremely great ...
الصفحة 88
... tangential force on the plane considered , all referred to a unit of surface , ( xty ) being reckoned positive when the part of the fluid towards – x urges that towards + x in the positive direction of y , and similarly for ( atz ) ...
... tangential force on the plane considered , all referred to a unit of surface , ( xty ) being reckoned positive when the part of the fluid towards – x urges that towards + x in the positive direction of y , and similarly for ( atz ) ...
الصفحة 91
... tangential forces T ,, the value of which in this case is -μ dv / dx . In this case it is easy to shew that the axes ... force , not including the molecular force ; let p be the density , t the time . Consider an elementary ...
... tangential forces T ,, the value of which in this case is -μ dv / dx . In this case it is easy to shew that the axes ... force , not including the molecular force ; let p be the density , t the time . Consider an elementary ...
الصفحة 96
... tangential force called into action would immediately destroy the finite relative motion of particles indefinitely close to each other , so as to render the motion continuous ; and from analogy the same might be supposed to be true for ...
... tangential force called into action would immediately destroy the finite relative motion of particles indefinitely close to each other , so as to render the motion continuous ; and from analogy the same might be supposed to be true for ...
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alter abruptly angle angular velocities approximation arbitrary axes axis become infinite Cambridge Philosophical Society canal centre co-ordinates condition Consequently considered constant convergent series corresponding cosines cylinder denote depth determined direction discontinuous displaced distance divergent series dx dy dx² dy dz dy² elastic equal equations of motion equilibrium ether exact differential expansion expression finite fluid motion formula friction function given h vanishes Hence homogeneous function incompressible fluid increases inertia integral limit luminiferous ether mass molecules moment of inertia observed obtained order of approximation oscillation paper parallel particles perpendicular plane Poisson pressure quantities ratio refracting respect result satisfied shew shewn sines solid sphere suppose surface theorem theory tion U₁ variables velocity of propagation waves whence zero ηπα аф
مقاطع مشهورة
الصفحة 114 - The capability which solids possess of being put into a state of isochronous vibration shews that the pressures called into action by small displacements depend on homogeneous functions of those displacements of one dimension. I shall suppose moreover, according to the general principle of the superposition of small quantities, that the pressures due to different displacements are superimposed, and consequently that the pressures are linear functions of the displacements.
الصفحة 142 - ... in the terrestrial methods of determining the velocity of light, the light comes back along the same path again, so that the velocity of the earth with respect to the ether would alter the time of the double passage by a quantity depending on the square of the ratio of the earth's velocity to that of light, and this is quite too small to be observed.
الصفحة 181 - ... accurate means of comparing theory and experiment in a class of motions in which they have not hitherto been compared, so far as I am aware. When a box of the form of a rectangular parallelepiped, filled with fluid and closed on all sides, is made to perform small oscillations, it appears that the motion of the box will be the same as if the fluid were replaced by a solid having the same mass, centre of gravity, and principal axes as the solidified fluid, but different principal moments of inertia....
الصفحة 126 - there seems no line of demarcation between a solid and a viscous fluid...
الصفحة 281 - U unless the convergency of the series (67) becomes infinitely slow when h vanishes. 'The convergency of the series is here said to become infinitely slow when, if n be the number of terms which must be taken in order to render the sum of the neglected series numerically less than a given quantity e, which may be as small as we please, n increases beyond all limit as h decreases beyond all limit. 'DEMONSTRATION. If the convergency do not become infinitely slow it will be possible to find a number...
الصفحة 182 - It is not absolutely necessary thaty(r") and F (r) should always have the same sign. In forming the equations of motion M. Navier adopts the hypothesis of a symmetrical arrangement of the particles, or at least, which leads to the same result, neglects the irregular part of the mutual action of neighbouring molecules. The equations at which he arrives are those which would be obtained from the common...
الصفحة 165 - Gréent» who has considered the case in which the depth is infinite. The oscillatory waves just considered are those which are propagated uniformly in fluid of which the depth is everywhere the same. When this condition is not satisfied, as for instance when the waves are propagated in a canal whose section is not rectangular, it is desirable to know how the velocity of propagation and the form of the waves are modified by this circumstance. There is one such case in which a solution has been obtained....
الصفحة 158 - Tom. ii. p. 42. III. The discharge of gases through small orifices. IV. Theory of sound. V. Simultaneous oscillations of fluids and solids. VI. Formation of the equations of motion when the pressure is not supposed equal in all directions. I. Although the common equations of hydrodynamics have been so long known, their complexity is so great that little has been done with them except in the case in which the expression usually denoted by udx+vdy+wdz (A.) is the exact differential of a function of...
الصفحة 50 - A similar result may be proved to be true for any solid symmetrical with respect to two planes at right angles to each other, and...
الصفحة 88 - In most cases in which it would be interesting to apply the theory of friction of fluids, the density of the fluid is either constant or may without sensible error be regarded as constant, or else changes slowly with the time. In the first two cases the results would be the same and in the third nearly the same whether T)v were equal to zero or not.