A Manual of Mechanics: An Elementary Text-book Designed for Students of Applied MechanicsLongmans, Green, 1886 - 228 من الصفحات |
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عبارات ومصطلحات مألوفة
acceleration action angle of friction angular applied axis axle balance beam body centre of gravity circular compression cubic foot cubic inches cylinder described diagram direction distance drawing elasticity equal equilibrium feet per second foot-pounds forces acting friction fulcrum given Hence horizontal plane hydrometer inch of mercury inclined iron lathe length lever lever-handle liquid load mandril measure mercury metal millimetres motion move number of teeth parallel forces parallelogram of forces particles pendulum perpendicular pinion piston pitch circles plate plunger position pound weight pressure pull pulley radius ratchet-wheel represent resistance rest revol right angles rotation round screw shown sliding solid space specific gravity square inch steel string surface tension thread tons tooth triangle tube turn uniform unit valve velocity vertical vessel weight wheel whereby
مقاطع مشهورة
الصفحة 25 - Every body continues in its state of rest or of uniform motion in a straight line, except in so far as it may be compelled by impressed forces to change that state.
الصفحة 26 - Change of motion is proportional to the impressed force and takes place in the direction of the straight line in which the force acts.
الصفحة 5 - All these things considered [that is, the chemical facts he had just recited], it seems probable to me that God in the beginning formed matter in solid, massy, hard, impenetrable, movable particles, of such sizes and figures, and with such other properties and in such proportion to space as most conduced to the end for which He formed them...
الصفحة 5 - All these things being considered, it seems probable to me that God in the beginning formed matter in solid, massy, hard, impenetrable, moveable particles, of such sizes and figures, and with such other properties and in such proportion to space as most conduced to the end for which he formed them; and that these primitive particles being solids are incomparably harder than any porous bodies compounded of them, even so very hard as never to wear or break in pieces, no ordinary power being able to...
الصفحة 27 - To every action there is always an equal and contrary reaction ; or the mutual actions of any two bodies are always equal and oppositely directed.
الصفحة 44 - ... the sum of the moments of the forces tending to turn the body in...
الصفحة 61 - Radian is the angle subtended, at the centre of a circle, by an arc equal in length to the radius...
الصفحة 50 - The centre of gravity of a body is that point in which the whole weight may be supposed to act^ or is the centre of parallel forces due to the weights of the respective parts of the body.
الصفحة 219 - A 1o-inch shaft has a 4-inch hole run through it ; what fraction of its weight is removed ? To what extent is its strength in resisting torsion affected ? Ans. 16 per cent. 2'56 per cent. 29. In the transmission of power by a rope, the wheel carrying the rope is 14 feet in diameter and makes 30 revolutions per minute, the tension of the rope being 100 Ibs. Find the amount of power transmitted, as estimated in horse-power. Ans. 4 HP 30.
الصفحة 209 - Ibs. 3. A compound axle consists of 2 parts, the diameters being 10 and 12 inches respectively, and a rope is coiled round them in opposite directions so as to form a 'loop, upon which hangs a pulley loaded to 48 Ibs. Considering the parts of the rope to be vertical, find the force which, acting at a leverage of 4 feet upon the axle, will just balance the weight. Sketch the arrangement. Ans.