Elementary Text-book of Physics |
Contents
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Common terms and phrases
angle angle of incidence axis battery body called cell centimetre coil colours compression concave conductor convex convex lens copper cubic centimetre denote density dew-point direction distance dynes earth electricity electrified electromotive force electroscope employed energy equal equilibrium ergs Find focal length friction galvanometer gases given glass grammes gravity Hence incident ray index of refraction iron lens lever Leyden jar light liquid magnet mass mechanical advantage mercury metal mixture nearly needle negative normal number of vibrations object observed opposite parallel particle passes perature piece plate pole position pressure principal focus prism produced pulse quantity radius ratio Réau reflected ray resistance scale side specific heat spectrum string substance surface telescope temperature thermal capacity thermometer tion tone tube unit vapour velocity of sound vertical vibrations per second volume wave-length waves weight wire zinc
Popular passages
Page 26 - ... 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 69 - The height of the mercury in the tube above that in the cistern measures the difference between the pressure in the receiver and that in the external air.
Page 206 - Polarization by Reflection. — Transmission through tourmaline is only one of several ways in which light can be polarized. When a beam of light is reflected from a polished surface of glass, wood, ivory, leather, or any other non-metallic substance, at an angle of from 50° to 60° with the normal, it is more or less polarized, and in like manner a reflector composed of any of these substances may be employed as an analyser. In so using it, it should be rotated about an axis parallel to the incident...
Page 142 - 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.