Practical Physics: Fundamental Principles and Applications to Daily Life |
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Popular passages
Page 156 - Every body continues in a state of rest, or of uniform motion in a straight line, unless it is compelled to change that state by a force impressed upon it.
Page 95 - Pumps for liquids. The ancients used pumps to lift water from wells, even though they did not know why a pump works ; they thought it was because " nature abhors a vacuum." We know now that the underlying principle is the same as in a mercurial barometer : it is the pressure of the atmosphere on the surface of the water in the well that pushes the water up into the pump.
Page 3 - I mean to say, that if arithmetic, mensuration, and weighing be taken away from any art, that which remains will not be much.
Page 147 - Newton's Three Laws of Motion," and are as follows: (1) All bodies continue in a state of rest, or of uniform motion in a straight line, unless acted upon by some external force that compels a change.
Page 298 - Since the resistance of a conductor varies directly as its length and inversely as its area of cross section, we can readily compute the resistance of a wire when its length and diameter are given.
Page 423 - The size of the image is to the size of the object as the distance of the image from the mirror is to the distance of the object from the mirror. 427. Conjugate foci. We have seen that when A is the object point, the image point is at A'.
Page 422 - A' MB' are similar, and A'B' B'M AB BM' So in this case, as before, the size of the image is to the size of the object, as the distance of the image from the mirror is to the distance of the object from the mirror.
Page 178 - ... the coefficient of cubical expansion is three times the coefficient of linear expansion. For...
Page 4 - The meter is the distance between two lines on a metal bar (Fig. 1) which is preserved in the vaults of the International Bureau of Weights and Measures near Paris...
Page 254 - But since they agree in all the particulars wherein we can already compare them, is it not probable they agree likewise in this ? Let the experiment be made.