Elements of Physics |
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Common terms and phrases
66 Rare amount angle atmospheric pressure atoms barometer battery boiling point Boyle's Law called carbon cell centimetres CHAPTER chemical coil cold color column of water compound conductor copper cubic cubic centimetre cylinder density direction disk distance earth electric current electrified energy equal ether ether waves fluid force galvanometer gases glass grammes grams heat Hence hydrogen hydrometer inches of mercury inversely iron length lens lever liquid machine magnet magnetite mass matter means measure mechanical mechanical advantage mercury metal millimetres mirror molecules moon musical needle north pole object pendulum physical pitch pith ball plane plate polarized pounds produced pump radiation rays of light reflected refraction represented resistance scale sealing wax simple siphon solid sound south pole specific gravity square inch substance surface temperature tension thermometer tion tube unit vapor velocity vessel vibrations volume waves weight wire zinc
Popular passages
Page 72 - Reaction is always equal and opposite to action ; that is to say, the actions of two bodies upon each other are always equal and directly opposite.
Page 72 - The rate of change of momentum is proportional to the impressed force, and takes place in the direction in which the force acts.
Page 186 - Where the waves pursue their way unabsorbed, no motion of heat is imparted, as we have seen in the case of the air thermometer. A joint of meat might be roasted before a fire, with the air around the joint as cold as ice.
Page 186 - A joint of meat might be roasted before a fire, with the air around the joint as cold as ice. The air on high mountains may be intensely cold, while a burning sun is overhead; the solar rays which, striking on the human skin, are almost intolerable, are incompetent to heat the air sensibly, and we have only to withdraw into perfect shade to feel the chill of the atmosphere. I never, on any occasion...
Page 72 - Every body perseveres in its state of rest or of moving uniformly in a straight line, except so far as it is made to change that state by external force (this applies to Ida's ribs).
Page 2 - We see, hear, taste, smell, touch, in our consciousness only. We cannot assert therefore that matter exists apart from this consciousness. Science has nothing to say about the ultimate nature of matter. Science studies matter simply as a fact of human experience. We are not concerned in physics with...
Page 8 - Kelvin has shown that if a drop of water were magnified to the size of the earth the molecules of water would be of a size intermediate between that of a cricket ball and of a marble.
Page 308 - Why the image is seen as far behind the mirror as the object is in front of it.— Let AB be an arrow held Fig.
Page 277 - ... to the ratio of the number of turns of wire in the primary to the number of turns in the secondary.
Page 12 - These introductory remarks have been brought in with the view of warning the reader that we are dealing with a subject so imperfectly known that at almost any part of it we may pass, by a single step as it were, from what is acquired certainty to what is still subject for mere conjecture. An exact or adequate conception of matter itself, could we obtain it, would almost certainly be something extremely unlike any conception of it which our senses and our reason will ever enable us to form.