A First Course in Physics |
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air pump ammeter ammonia amount ampere armature atmosphere ball barometer body Boyle's law bulb calories circuit coil condenser conductor connected cooling copper cubic centimeter cylinder Daniell cell density diameter direction distance dynamo earth electricity electroscope energy engine equal exactly exerted experiment fact fall flow force acting freezing friction galvanic cell galvanometer gases glass gram heat Hence hydrogen inch induced iron kinetic Leclanché cell lens Lenz's law lever Leyden jar light lines of force liquid machine mass measure mechanical advantage mercury metal meter molecular molecules motion move needle pass pendulum pipe piston placed plane plate pole pressure produced pull QUESTIONS AND PROBLEMS resistance rise rotation saturated shown in Fig shows solid steam substances surface temperature thermometer tion tube valve vapor velocity vessel vibration volts volume wave length weight wheel wire zinc
Popular passages
Page 1 - I often say that when you can measure what you are speaking about and express it in numbers you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind...
Page 94 - Newton's first law of motion: <•• « > " Every body continues in its state of rest or uniform motion in a straight line, except in so far as it is compelled to change that state by force impressed upon it.
Page 328 - It will be seen from the above that the number of beats per second is equal to the difference in the vibration numbers of the two forks.
Page 356 - And show me how they calculated the initiatory speed of our car?" "Yes, my worthy friend; taking into consideration all the elements of the problem, the distance from the center of the earth to the center of the moon...
Page 83 - Any two bodies in the universe attract each other with a force which is directly proportional to the product of the masses and inversely proportional to the square of the distance between them.
Page 22 - Archimedes stated that a body immersed in a fluid is buoyed up by a force equal to the weight of the displaced fluid.
Page 79 - For in § 79 it was shown that if any one force is to have the same effect upon a body as two forces acting simultaneously, it must be represented by the diagonal of a parallelogram the sides of which represent the two forces. Hence, conversely, if two forces are to be equivalent in their...
Page 3 - The meter was intended to be one ten-millionth of the distance from the equator to the north pole, but more careful measurements show that this distance is 10,001,887 meters.
Page 9 - Distinction between density and specific gravity. The term "specific gravity" is used to denote the ratio between the weight of a body and the weight of an equal volume of water.* Thus, if a...
Page 132 - The erg is the amount of work done by a force of 1 dyne when it moves the point on which it acts 1 centimeter. To raise 1 liter of water from the floor to a table 1 meter high would require 1000 x 980 x 100 = 98,000,000 ergs of work. It will be seen, therefore, that the erg is an exceedingly small unit. For this reason it is customary to employ a unit which is equal to 10,000,000 ergs. It is called a joule, in honor of the great English physicist James Prescott Joule (1818-1889). The work done in...