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acting action angle appears applied attraction ball battery body called cause cell centre charge circuit closed coil colors conductor connected consists copper diameter direction disk distance draw earth effect electric energy equal evident experiment fall feet flow focus force give glass grammes greater heat Hence Hold illustrates inches incident increase iron known length lens less light liquid lower machine magnet mass matter means measure mercury metallic mirror motion moving needle object opposite parallel particles passes piece plane plate pole position potential pressure principal produced quantity raise rays reflected refraction represent resistance rest resultant scale screen seen shown shows side solid sound square substance surface temperature tion tube turn unit varies velocity vertical vessel vibration volume waves weight wire zinc
Page 327 - 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 218 - Resistance Inversely Proportional to Cross-Section. The resistance of a conductor is inversely proportional to its cross-sectional area. Hence the greater the cross-section of a wire the less is its resistance. Therefore, if two wires have the same length, but one has a cross-section three times that of the other, the resistance' of the former is one-third that of the latter.
Page 218 - As a unit of resistance, the international ohm, which is based upon the ohm equal to 10" units of resistance of the CGS system of electromagnetic units, and is represented by the resistance offered to an unvarying electric current by a column of mercury at the temperature of melting ice, 14.4521 grams in mass, of a constant cross-sectional area and of the length of 106.3 centimetres.
Page 33 - Every body continues in its state of rest or of uniform motion in a straight line, except in so far as it is compelled by force to change that state.
Page 50 - Newton generalized the law of attraction into a statement that every particle of matter in the universe attracts every other particle with a force which varies directly as the product of their masses and inversely as the square of the distance between them; and he thence deduced the law of attraction for spherical shells of constant density.
Page 33 - Change of motion is proportional to the impressed force and takes place in the direction of the straight line in which the force acts.
Page 110 - The loss of weight of a body immersed in a fluid is equal to the weight of the displaced fluid, or a body immersed in a fluid is buoyed up by a force equal to the weight of the fluid displaced by it.
Page 311 - AC (Fig. 124), the greater part of it is reflected in a definite direction. The angle that the incident ray makes with the normal PB to the reflecting surface at the point of incidence is called the angle of incidence, as IBP ; and the angle between the reflected ray and this normal is the angle of reflection, as RBP.
Page 325 - The incident ray, the reflected ray, and the normal to the surface at the point of incidence, all lie in the same plane. When a ray of light is refracted, n sin <t> = n...