A Text-book of Physics

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D.C. Heath, 1911 - Physics - 649 pages


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Page 120 - 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 394 - 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 143 - that every particle of matter in the universe attracts every other particle, with a force whose direction is that of the line joining the two, and whose magnitude is directly as the product of their masses, and inversely as the square of their distances from each other.
Page 219 - 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 the Heat was excited and communicated in these experiments, except it be MOTION.
Page 356 - The organ of hearing consists of three parts : the external ear, the middle ear or tympanum, and the internal ear or labyrinth. The External Ear consists of an expanded portion or pinna, and the auditory canal or meatus.
Page 132 - It seems almost as if nature had resorted to an extraordinary freak to furnish Galileo at this critical moment in the history of science, with an unusual convenience for his public demonstration. Yonder tower of Pisa had bent over to facilitate experimentation, from its top, on falling bodies. One morning, before the assembled university, he ascended the leaning 1 AD WHITE, op.
Page 249 - The specific heat of a substance is numerically equal to the number of calories required to raise the temperature of one gram of the substance one degree Centigrade.
Page 319 - It varies directly as the square root of the elasticity, and inversely as the square root of the density.
Page 163 - These are usually accounted six in number, viz. the Lever, the Wheel and Axle, the Pulley, the Inclined Plane, the Wedge, and the Screw.
Page 219 - It is difficult to describe the surprise and astonishment,' says Rumford, ' expressed in the countenances of the bystanders, on seeing so large a quantity of cold water (i8J Ib.) heated, and actually made to boil without any fire.

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