Elementary Text-book of Physics |
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Common terms and phrases
angle atmospheric pressure axis barometer barrel battery body Boyle's law called centimetres centre of gravity colours column concave conductor convex convex lens cubic cubic centimetre cubic foot denote density direction distance electricity electrified electromotive force employed equal equilibrium expansion Find focal length force friction gases glass grammes Hence immersed inches incident index of refraction iron lens Leyden jar light liquid magnet mass mercury mirror mixture nearly needle normal number of vibrations object observed opposite parallel particle perature piston plane plate portion position principal focus prism produced pulse quantity ratio rays reflected relative density scale side siphon slit solid sound specific gravity specific heat spectrum substance surface telescope temperature thermal capacity thermometer tion tube unit valve vapour velocity velocity of sound vertical vessel vibrations per second volume wave-length waves weight wire
Popular passages
Page 27 - 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 4 - The condition of equilibrium for three forces acting at a point is, that they be represented in magnitude and direction by the three sides of a triangle, taken one way round.
Page 22 - ... portions jointly support the weight. The cord which supports the next pulley is stretched with a force half of this, or a quarter of the weight; and the next cord with a force half of this, or an eighth of the weight; but this cord is directly attached to the power. Thus the power is an eighth of the weight, or the mechanical advantage is 8. If the weight and the block1 to which it is attached rise 1 inch, the next block rises 2 inches, the next 4, and the power moves through 8 inches. Thus,...
Page 151 - 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 141 - The angle which the incident ray makes with the normal at the point of incidence is called the angle of incidence, and the plane of this angle is the plane of incidence.
Page 1 - ... surface (equal particles being urged with equal forces and in parallel directions), tends to give the body a movement of pure translation. In elementary statements of the laws of force, it is necessary, for the sake of simplicity, to confine attention to forces tending to produce pure translation. 7. Instruments for Measuring Force. — We obtain the idea of force through our own conscious exercise of muscular force, and we can approximately estimate the amount of a force (if not too great or...
Page 157 - The radius of the sphere is called the radius of curvature of the mirror, and the centre of the sphere is called the centre of curvature.
Page 226 - In order to determine the number of vibrations corresponding to any given sound which we have the power of maintaining steadily, we fix the siren on the bellows, the screw and wheel being disconnected, and drive the siren until the note which it emits is judged to be in unison with the given note. We then, either by regulating the pressure of the wind, or by employing the finger to press with more or less friction against the revolving axis, contrive to keep the note of the siren constant for a measured...
Page 22 - ... weight as MT to MP; but the two triangles MTP and ACB are similar, since the angles at M and A are equal, and the angles at T and C are right angles; hence MT is to MP as AC to AB, that is, as the height to the length of the plane. 65. The investigation is rather easier by the principle of work (§ 49). The work done by the power in drawing the heavy body up the plane, is equal to the power multiplied by the length of the plane. But the work done upon the weight is equal to the weight multiplied...
Page 203 - Hsht by the naked eye; and for all experiments in polarization two pieces of apparatus must be employed — one to produce polarization, and the other to show it. The former is called...