Principles of Physics: Designed for Use as a Textbook of General Physics

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Century Company, 1911 - Physics - 570 pages
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Page 214 - All these things being considered, it seems probable to me that God in the beginning formed matter in solid, massy, hard, impenetrable, moveable particles, of such sizes and figures, and with such other properties and in such proportion to space as most conduced to the end for which he formed them; and that these primitive particles being solids are incomparably harder than any porous bodies compounded of them, even so very hard as never to wear or break in pieces, no ordinary power being able to...
Page 469 - ... surface varies as the cosine of the angle between the normal to the surface and the direction of the radiation.
Page 330 - It is impossible by means of inanimate material agency to derive mechanical effect from any portion of matter by cooling it below the temperature of the coldest of the surrounding objects.
Page 309 - It is hardly necessary to add, that anything which any insulated body, or system of bodies, can continue to furnish without limitation, cannot possibly be a material substance; and it appears to me to be extremely difficult, if not quite impossible, to form any distinct idea of anything capable of being excited and communicated in the manner Heat was excited and communicated in these experiments, except it be MOTION.
Page 80 - I. Every body continues in its state of rest or of uniform motion in a straight line, except in so far as it may be compelled by impressed forces to change that state.
Page 344 - When a ray of light passes from one medium to another, it is refracted so that the ratio of the sine of the angle of incidence to the sine of the angle of refraction is equal to the ratio of the velocities in the two media.
Page 311 - Joule used a similar apparatus in which the vessel and paddle were made of iron, and the liquid was mercury, and also an apparatus in which the friction which developed heat was that between two iron plates rubbed together under mercury. From these three forms of the experiment he obtained the result that the amount of work which will raise the temperature of a pound of water one degree Fahrenheit is 772 foot pounds. This statement is equivalent to the statement that the amount of work which will...
Page 126 - The starting point of this analysis is the equation of motion of a damped compound pendulum where / is the moment of inertia of the pendulum about its axis of...
Page 491 - The current is assumed to flow from a point of higher potential to a point of lower potential in...
Page 570 - His first law, that the planets do not move in circles but in ellipses ; his second law, that they describe equal spaces in equal times ; his third law, that the squares of their periodic times are proportional to the cubes of their distances. That man gave us the key to the heavens.

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