# Elements of Physics

Macmillan Company, 1906

### Contents

 Intensity of Sound 49 Pitch of Sound 50 Effect of Tension on Frequency 51 Effect of Mass on Frequency 52 Sounding Boards 53 Beats 54 Umbra and Penumbra 55 Effect of Distance on Illumination 56 Candle Power of Light 57 Angles of Incidence and Reflection 58 Location of Image with Plane Mirrors 59 Images with Concave Mirrors 60 Real and Virtual Images 61 Refraction 62 Images with Convex Lens 63 Real and Virtual Images with a Lens 64 MECHANICS OF SOLIDS 74 Machines 82 Friction 92 CHAPTER V 98 Buoyancy 106 Mechanics of Gases 112 CHAPTER VI 125 Transference of Heat 143 Heat Measurements 150 Heat and Work 162 CHAPTER VII 177 Force 184 Voltaic Electricity 197 Electric Currents 204 Effects of Electric Current 214 Electrical Measurements 222 Electromagnetism 237 Induced Currents 243
 Propagation and Transmission of Light 310 Reflection of Light 317 Refraction of Light 331 Applications of Refraction 340 Chromatics 365 SOUND CHAPTER IX 367 Laws of Motion and Force 369 243 378 257 379 274 383 276 384 303 385 310 386 Universal Gravitation 1 The Pendulum 7 288888 15 26 23 36 30 39 32 40 33 41 34 42 35 43 36 44 38 45 39 46 40 47 41 48 42 50 43 52 44 333 45 56 46 387 53 Copyright

### Popular passages

Page 185 - The force of attraction or repulsion between two point charges is directly proportional to the product of the charges and inversely proportional to the square of the distance between them.
Page 28 - Every body continues in its state of rest, or of uniform motion in a straight line, unless it is compelled to change that state by forces impressed upon it.
Page 82 - Powers, are certain simple instruments, commonly employed for raising greater weights, or overcoming greater resistances, than could be effected by the natural strength without them. These are usually accounted six in number, viz. the Lever, the Wheel and Axle, the Pulley, the Inclined Plane, the Wedge, and the Screw.
Page 108 - Hence a floating body displaces its own weight of the liquid in which it floats.
Page 151 - Just as we call the specific gravity of a substance the ratio between its weight and the weight of an equal volume of water...
Page 150 - It overcomes the attractive forces that tend to hold the molecules of a substance together, and thus changes it from a solid to a liquid or from a liquid to a gas, according to the state it was in when the heat was applied.