By Wilhelm H Westphal
This ebook is a translation of the sixth to eighth version of the author's Kleines Lehrbuch der Physik. The circle of readers to which it hopes to attraction and the author's objective in writing it were set out within the Preface to the 1st German version, released in 1948. the current e-book continuously follows the foundations of the speculation of amounts, the beginnings of which date again to James C. Maxwell. which means in all equations during this publication the symbols continuously stand for actual amounts and never for the numerical values of amounts. in simple terms then are the equations gene rally legitimate and self sustaining of the alternative of devices utilized in their assessment. The devices used are regularly the "metric" devices that have been gaining floor more and more additionally within the English-speaking nations. A conversion desk for a few of the extra very important Anglo-American devices is given on web page XIV. i want to list 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 interpreting, England, either for the recommendation he has given hirn all through and for devising the issues in particular for this variation.
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Extra resources for A Short Textbook of Physics: Not Involving the Use of Higher Mathematics
Such work is then always performed by the force against which work had previously been done on the body - by gravity, by the force of a previously compressed or extended spring, or by inertia. A body on which work has been done has thus adefinite amount of stored-up work and this is known as energy. If this is due to a previous displacement we speak of potential energy. e. to the motion ofthe body, it is called kinetic energy. cord running over a pulley. If we give it a downward push, however slight, it will descend and, in doing so, cause the second body to be raised by the same amount.
In electrical engineering the unit of work is usually 1 kilowatt-ho ur (kWh), the amount of work done in one hour by apower (Section 26) of 1 kilowatt: 1 kWh= 1000 x 60 x 60 J = 3·6 X 106 J (Ws). 25. Energy. Whenever displacement or acceleration work has been done on a body a condition has been achieved which makes it possible for new work to be done if the body returns to its former state. A raised body, by sinking or falling down again, can raise another body by its weight or do acceleration work on itself.
F or a specified direction of the axis the moment of inertia is smallest when the axis lies through the body's center of gravity. Any body, of whatever shape, 34. Couples and torques 40 has one definite axis through its center of gravity about which it has the smallest moment of inertia; perpendicular to it is one definite axis through its center of gravity about which the body has the greatest moment of inertia that it can have about any axis through its center of gravity. These two axes, together with the third axis through the center of gravity perpendicular to the first two, are known as principal axes of inertia and the moments of inertia the body has about them are its principal moments of inertia.
A Short Textbook of Physics: Not Involving the Use of Higher Mathematics by Wilhelm H Westphal