By Wilhelm H Westphal
This booklet is a translation of the sixth to eighth variation of the author's Kleines Lehrbuch der Physik. The circle of readers to which it hopes to allure and the author's function in writing it were set out within the Preface to the 1st German version, released in 1948. the current ebook continually follows the foundations of the idea of amounts, the beginnings of which date again to James C. Maxwell. which means in all equations during this booklet the symbols consistently stand for actual amounts and never for the numerical values of amounts. in basic terms then are the equations gene rally legitimate and autonomous of the alternative of devices utilized in their review. The devices used are continuously the "metric" devices that have been gaining floor more and more additionally within the English-speaking international locations. A conversion desk for the various extra vital Anglo-American devices is given on web page XIV. i need to checklist my honest gratitude to Mr. Ewald Osers for his pains taking paintings in making this translation and to Mr. P. C. Banbury, Ph. D., of the dep. of Physics, college of studying, England, either for the recommendation he has given hirn all through and for devising the issues especially for this variation.
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Extra info for A Short Textbook of Physics: Not Involving the Use of Higher Mathematics
Textbook of Physics LlE =-. 2) 34 30. Friction Thus the mass of a body increases with its kinetic energy, with the amount of heat contained in it (which is kinetic energy of its molecules), etc. However, these effects are immeasurably small unless the velocities involved are at least approximately of the order of magnitude of the speed of light. The mass of a body at rest is called its rest mass m o. 3) in other words it increases with velocity. e. the body would become infinitely inert and no force however large could accelerate it further.
A practical application of centrifugal force is the centrifuge, in which substances of differing density are separated from each other by the different magnitudes of centrifugal force acting on unit volumes - e. g. butter from milk. (See Westphal, Physics for Y ou and Me, George G. Harrap & Co. , 1965). 33. Moment of inertia. Suppose that a point mass is moving about an axis (Section 9) along a circIe of radius r with a speed v = rw and an angular velocity w. 2) The magnitude I is called the moment of inertia of the point mass.
The center of gravity. Theorem of the center of gravity. Suppose that two point masses m 1 and m2 are connected into a rigid body by means of a mass-Iess rod (Fig. 17). The weight F = mg = (mi + m2) g of this body is the resultant of the weights m 1 g and m2 g ofthe two point masses, constructed according to Section 15. I m2Q, I I(mi +m2)Q, I I I + Fig. 17. e. the point of application of the resultant, is known as the center 0/ gravity, or the center 0/ mass of the body, and equally of the system consisting of the two point masses if these are not rigidly joined to each other.
A Short Textbook of Physics: Not Involving the Use of Higher Mathematics by Wilhelm H Westphal