The New Text-book of Physics: An Elementary Course in Natural PhilosophyC. Scribner's sons, 1880 - 317 من الصفحات |
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action acts angle angle of incidence atmosphere attraction ball battery bulb called Chemism coil colors column concave concave lens condensed conductor constant force convex convex lens cord cubic inches current electricity cylinder direction disk distance Ductility earth elastic electricity energy equal exerted expansion experiment fall feet flame fluid friction frictional electricity gases glass tube heat Hence hydrometer illustrate inertia instrument iron latent heat length lens lever lifted liquid magnet mass mercury metal mirror molecules motion move needle number of vibrations orifice parallelogram particles pass pendulum piston placed plate polarized pole pounds pressure principle produced properties pulley pushed rays of light reflected refraction represented repulsion resistance rest rise seen shows side solid bodies sound space specific gravity steam substance suppose surface temperature thrown tion undulations upward velocity vessel waves weight wheel wire zinc
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الصفحة 280 - There is an equilibrium upon the wheel and axle when the power is to the weight as the radius of the axle to the radius of the wheel.
الصفحة 143 - Whatever may be its cause, the effect of pressure is to raise the boiling point. It is well known that water boils at a lower temperature on the top of a mountain than at its base. It does so because the pressure of the air upon it is less. This very important principle may be easily illustrated by experiment. For this purpose take a glass 243 flask, or better, a bolt head (Fig.
الصفحة 238 - ... insulated it by fastening it to a post by means of a silk cord, and anxiously awaited the approaching storm. A dense cloud, apparently charged with lightning, soon passed over the spot where he stood, without causing his apparatus to give any sign of electricity. He was about to give up in despair, when he caught sight of some loose fibers of the hempen cord, bristling up as if repelled. He immediately presented his knuckle to the key, and received an electric spark. The string of his kite soon...
الصفحة 125 - ... its moving force destroyed by collision with the earth. Conversely, the amount of heat necessary to raise a pound of water one degree in temperature, would, if all applied mechanically, be competent to raise a pound weight 772 feet high, or it would raise 772 pounds one foot high. The term ' foot-pounds ' has been introduced to express in a convenient way the lifting of one pound to the height of a foot.
الصفحة 31 - Now let the vessel be removed, and another, in the form shown at E, be put in its place. If water be poured into this vessel until it stands as high as it did in the other, the mercury will be seen to rise in CD to the same point as before. Vessels of various other forms may be used; but, if all are of the same height, the water which fills them will push the mercury to the same point on the scale. We infer that the pressure of a fluid downward is quite independent of the shape of the vessel and...
الصفحة 61 - Avogadro's law states that equal volumes of all gases at the same temperature and pressure contain the same number of molecules...
الصفحة 252 - The strength of the current is equal to the electro-motive force divided by the resistance...
الصفحة 149 - The Glaciers of the Alps ' I have referred to a case of short auditory range noticed by myself, in crossing the Wengern Alp iu company with a friend. The grass at each side of the path swarmed with insects, which to me rent the air with their shrill chirruping. My friend heard nothing of this, the insect-music lying quite beyond his limit of audition.
الصفحة 178 - 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.
الصفحة 35 - SPECIFIC GRAVITY. The ratio of the weight of a body to the weight of an equal volume of some other body taken as the standard or unit. This standard is usually water for solids and liquids, and air for gases.