# Forty Lessons in Physics

H. Holt, 1906 - Physics - 452 pages

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### Contents

 COMPOSITION OF FORCES 76 UNIVERSAL GRAVITATION 86 GRAVITY 92 THE PENDULUM 102 GRAVITY ACTING ON LIQUIDS 110 ATMOSPHERIC PRESSURE 120 WORK AND ENERGY 132 SIMPLE MACHINES 142 SIMPLE HARMONIC MOTION 154 SOUND 167 THE SOURCES OF SOUND 168 THE TRANSMISSION OF SOUND 180 THE EFECT OF SOUND 188 LIGHT 201
 THE THEORY OF HEAT 266 THE SOURCES OF HEAT 276 THE TRANSMISSION OF HEAT 284 THE EFFECTS OF HEATEXPANSION 294 THE EFFECTS OF HEAT_CHANGE OF STATE 302 HEAT ENGINES 318 ELECTRICITY 327 STATIC ELECTRICITY 328 CURRENT ELECTRICITY 348 MAGNETISM 368 CURRENT ELECTRICITY AND HEAT 394 RESISTANCE AND ELECTROMOTIVE FORCE 402 COMMERCIAL APPLICATIONS OF ELECTROMAGNETISM AND INDUCED CURRENTS 414 ELECTRIC WAVES 440

### Popular passages

Page 228 - 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 114 - 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 272 - British thermal unit — the amount of heat required to raise one pound of water one degree Fahrenheit.
Page 353 - 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 86 - The weight of an object above the surface of the earth varies inversely as the square of its distance from the center of the earth.
Page 376 - Grasp the wire in the right hand, with the thumb pointing in the direction of the current. The fingers will curl around the wire in the direction of Conductor the magnetic field".
Page 232 - It may also be defined as the sine of the angle of incidence divided by the sine of the angle of refraction, as light passes from air into the substance.
Page 353 - Such an electromotive force as would cause a current of one ampere to flow through a resistance of one ohm.
Page 114 - The specific gravity of any substance is the ratio of the weight of that substance to the weight of an equal volume of. some substance taken as a standard.
Page 132 - An erg is the work done by a force of one dyne acting through a distance of one centimeter ; or unit work is done by unit force acting through unit distance.