A Manual of Applied MechanicsC. Griffin, 1870 - 698 من الصفحات |
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طبعات أخرى - عرض جميع المقتطفات
عبارات ومصطلحات مألوفة
acting angle angle of repose angular momentum angular velocity applied Article axes bars beam body centre of gravity centre of pressure centre of resistance co-efficient co-ordinates component conjugate pressure cord cos² couple curvature curve denote depth deviation diagonal diameter direction distance ellipse equal and opposite equation equilibrium extrados figure fluid formula frame friction girder given horizontal inclination inertia intensity joint length line of action linear arch lines of resistance moment of inertia motion neutral axis normal oblique P₁ P₂ pair parallel forces parallel projection perpendicular plane of section polygon position principles prism proportional radius radius of curvature ratio rectangular represent respectively resultant rotation secondary truss shearing shearing stress sin² spandril specific gravity stability straight line stress structure supporting forces surface tangent tenacity tension THEOREM thrust tion traversing uniform weight wheel x₁ Λ Λ Λ
مقاطع مشهورة
الصفحة 209 - Friction is that force which acts between two bodies at their surface of contact so as to resist their sliding on each other, and which depends on the force with which the bodies are pressed together.
الصفحة 56 - ... constant. Let x\, y,, z, be the co-ordinates of the centre of gravity of a flat plate having its middle plane coincident with the given cross-section.
الصفحة 502 - ... of those parts into the square of the distance of its centre of gravity from the axis, adding the products together, and finding the value towards which their sum converges when the size of the small parts is indefinitely diminished.
الصفحة 2 - The mathematician can easily demonstrate that a certain power, applied by means of a certain lever or of a certain system of pulleys, will suffice to raise a certain weight. But his demonstration proceeds on the supposition that the machinery is such as no load will bend or break. If the engineer, who has* to lift a great mass of real granite by the instrumentality of real timber and real hemp, should absolutely rely on the propositions...
الصفحة 264 - ... being the angle of repose. If the earth is firm, and little liable to be disturbed, the proportion of the half-span, or horizontal semi-axis, to the rise, or vertical semi-axis, may be made greater than is given by the preceding equation, and the earth will still resist the additional horizontal thrust; but that proportion should never be made less than the value given by the equation, or the sides of the archway will be in danger of being forced inwards.
الصفحة 6 - Mechanical knowledge may obviously be distinguished into three kinds: purely scientific knowledge, — purely practical knowledge — and that intermediate knowledge which relates to the application of scientific principles to practical purposes, and which arises from understanding the harmony of theory and practice. The objects of instruction in purely scientific mechanics and physics are, first to produce in the student that improvement of the understanding which results from the cultivation of...
الصفحة 470 - NBM, or inertia, of a body, is a quantity proportional to the unbalanced force which is required in order to produce a given definite change in the motion of the body in a given interval of time. It is known that the weight of a body, that is, the attraction between it and the earth, at a fixed locality on the earth's surface, acting unbalanced on the body for a fixed interval of time (eg, for a second), produces a change in the body's motion, which is the same for all bodies whatsoever.
الصفحة 581 - SUBFACE. 593 being equal to the weight of a column of fluid whose base is the sectional area of the jet, and its height double of the height due to the velocity. This result is confirmed by experiment.
الصفحة 5 - Another evil, and one of the worst which arises from the separation of theoretical and practical knowledge, is the fact that a large number of persons, possessed of an inventive turn of mind and of considerable skill in the manual operations of practical mechanics, are destitute of that knowledge of scientific principles -which is requisite to prevent their being misled by their own ingenuity. Such men too often spend their money, waste their lives, and it may be lose their reason, in the vain pursuit...
الصفحة 21 - ... 26. Force of a Couple — Arm or Leverage. — The force of a couple 18 the common magnitude of the two equal forces ; the arm or leverage of a couple is the perpendicular distance between the lines of action of the two equal forces.