The heading in the edition is: What weight is. in .NET Make UPC A in .NET The heading in the edition is: What weight is.

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On weight 78 But now I want you to consider what the weight of this Earth is, that is, what the force is that unites all its parts and makes them all tend toward the centre, each more or less according to the extent of its size and solidity. This force is nothing but, and consists in nothing but, the parts of the small heaven which surround it turning much faster than its own parts about its centre, and tending to move away with greater force from its centre, and as a result pushing the parts of the Earth back toward its centre. You may nd this presents di culties, given that I have just said that the most massive and the most solid bodies, such as I have supposed those of comets to be, tend to move outwards to the circumferences of the heavens, and that only those that are less so are pushed back to their centres; as if it followed from this that only the less solid parts of the Earth could be pushed back towards its centre, and that others should move away from it.

But note that, when I said that the most massive and solid bodies tended to move away from the centre of a heaven, I was assuming that they were already moving with the same agitation as the matter of that heaven. For it is certain that, if they had not yet begun to move, or if they move at a speed less than that required to follow the course of this matter, they must rst be pushed toward the centre around which it is turning; and it is indeed certain that, to the extent to which they are larger and more solid, they will be pushed with more force and speed. Nevertheless, if they are able to compose comets, they will not be prevented from tending to move, a short time later, toward the exterior circumference of the heavens, because the agitation they have acquired in descending toward any one of the heaven s centres will unfailingly provide them with the force to pass beyond it and to ascend again toward its circumference.

In order to understand this more clearly, consider the Earth [ g. ], with water . .

. and air . .

. which, as I shall tell you below,. use .net vs 2010 upca writer torender upc-a supplement 5 on .net iReport The heading in the edition is: What weight is. The World and Other Writings Fig. are compos ed just of some of the less solid of the Earth s parts, and make up a single mass with it. Next consider also the matter of the heaven, which not only lls all the space between the circles and . .

. , but also all the small intervals below it among the parts of the air, the water, and the Earth. And imagine that, as this heaven and this Earth turn together around the centre , all their parts tend to move away from it, but those of the heaven very much more than those of the Earth, because they are very much more agitated.

And we can even imagine that, among the parts of the Earth, those that are more agitated in the same direction as those of the heaven tend to move away from the centre more than do the others. So that, if the entire space beyond the circle were void, that is, were lled only with matter that was not able to resist the actions of other bodies or to have any signi cant e ect (for this is how we should construe the term void ), then all the parts of the heaven in the circle would leave it rst, followed by those of the air and the water, and nally those of the Earth as well, each moving more quickly to the extent that it nds itself less attached to the rest of the mass. In the same way, a.

The Treati .net vs 2010 UPC-A Supplement 2 se on Light stone leaves the sling in which it is being moved as soon as one releases the cord, and the dust one throws on a top while it is turning immediately ies o from it in every direction. Then consider that, since there is no space such as this beyond the circle that is void and where the parts of the heavens contained within that circle are able to go, unless others which are exactly similar replace them simultaneously, the parts of the Earth cannot move away any further than they do from the centre either, unless just as many parts of heaven or other terrestrial parts required to ll them come down to replace them.

Nor, conversely, can they move closer to the centre unless just as many others rise in their place. Thus they are all opposed to one another, each one being opposed to those that must replace it should it rise, and to those that must replace it should it descend, just as the two sides of a balance are opposed to one another.79 That is to say, just as one side of the balance can only be raised or lowered if the other side, at exactly the same instant, moves in the opposite direction, and just as the heavier always makes the other rise, so too the stone , for example, is so opposed to the quantity of air above it, which is exactly the same size as it and whose place it would have to occupy if it were to move further away from the centre , that this air would of necessity have to descend to the extent that the stone rose.

And in the same way it is opposed to another equal quantity of air below it, whose place it would have to occupy if it were to move closer to that centre , such that the stone must descend when this air rises. Now it is evident that, since much more terrestrial matter is contained within this stone than is contained in an amount of air of equal extent, and that to counterbalance this it contains much less celestial matter, and since its terrestrial parts are far less agitated by celestial matter than those of that air, the stone should not have the force to rise above it; but on the contrary this amount of air should rather have the force to make the stone fall downwards. Thus that amount of air is light when compared with the stone, but when compared with the completely pure celestial matter it is heavy.

In this way you can see that every part of terrestrial bodies is pressed towards , not indi erently by all the matter surrounding it but only by an amount of the matter exactly equal to the size of that part and which, being underneath the part, can take its place if that part moves. The image of the balance here is a revealing indication of the source of Descartes thinking about these mechanical issues: statics.. The World visual .net UPC-A and Other Writings down. This is the reason why, among the parts of any single body that we call homogeneous , such as those of air or water, the pressure on the lowest is not notably more than that on the highest, and why a man at the bottom of very deep water does not feel it pressing on his back any more than if he were swimming right on top.

80 But if it seems to you that the celestial matter, in making the stone fall towards , below the air surrounding it, should also make it travel faster than this air towards or that is, towards the east or the west so that the stone does not fall in a straight plumb line as do heavy bodies on the real Earth, consider rst that all the terrestrial parts contained in the circle . . .

, in being pressed toward by the celestial matter in the way I have just explained, and moreover having very irregular and diverse shapes, must join together and approach one another, and in this way make up only one mass, which is borne as a whole by the course of the heaven . Thus, while it turns, those of its parts that are at , for example, always remain opposite those that are at and at , without any appreciable movement to one side or the other except in so far as winds or other particular causes make them do so. And note also that the little heaven turns much faster than this Earth, but those of its parts that are caught in the pores of terrestrial bodies cannot turn appreciably faster than these bodies about the centre , even though they move much faster in many other directions, depending on the disposition of those pores.

Next you should know that even though the celestial matter makes the stone approach this centre, because it tends to move away from it with more force than the stone, it cannot for all that force the stone back up towards the west, despite the fact that it tends to move towards the west with a greater force than the stone. For consider that this celestial matter tends to move away from the centre because it tends to continue its motion in a straight line; nevertheless, it tends to move from west to east only because it tends to continue in its motion at the same speed and, moreover, because it does not make the slightest di erence to it whether it nds itself at or at . Now it is evident that its motion is slightly more rectilinear while it is causing the stone to fall towards than it is in leaving the stone at ; but if it caused the stone to move back towards the west it would not be able.

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