Introduction to Physical Science

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W.J. Gage, 1902 - Physics - 359 pages
Physics/chemistry textbook authorized for use in Saskatchewan schools, 1895-1907 (Langley's thesis, Tables 9, 10, 11). With brief preface on methods of teaching elementary physics. Has chapters on fluid pressure, dynamics, heat, sound, light, electrostatics, and electro-kinetics.
 

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Page 221 - 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 100 - 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 290 - 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 236 - See f/stop. focal length When the lens is focused on infinity, it is the distance from the optical center of the lens to the focal plane. focal plane The plane on which a lens forms a sharp image. Also, it may be the film plane or sensor plane.
Page 137 - Specific Heat. — The specific heat of a substance is the ratio of the quantity of heat required to raise the temperature of...
Page 111 - An erg is the work done by a force of 1 dyne acting through a distance of 1 cm.
Page 69 - The moment of a force is said to be positive when it tends to produce right-hand rotation, ie rotation in the direction in which the hands of a clock move, and negative when its tendency is in the reverse direction. If two forces act at different points of a body which is free to rotate about a fixed point, they will produce equilibrium when the algebraic sum of their moments is zero.
Page 312 - Variation of the Needle. Inasmuch as the magnetic poles of the earth do not coincide with the geographical poles, it follows that in most places the needle does not point due north and south.
Page 149 - Again, the volume of a given mass of gas is inversely proportional to its...
Page 230 - The quotient (in this case £ = 1.33+) obtained by dividing the sine of the angle of incidence by the sine of the angle of refraction, generally expressed in the form of a decimal fraction, is called the index of refraction.

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