A Manual of Mechanics: An Elementary Text-book Designed for Students of Applied Mechanics

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Longmans, Green, 1886 - 228 стор.
 

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Сторінка 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.
Сторінка 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.
Сторінка 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...
Сторінка 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...
Сторінка 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.
Сторінка 44 - ... the sum of the moments of the forces tending to turn the body in...
Сторінка 61 - Radian is the angle subtended, at the centre of a circle, by an arc equal in length to the radius...
Сторінка 224 - If this weight be removed and two weights, each equal to P Ibs., be hung at distances of 2 and 4 feet along the bar, what is the greatest value which may be assigned to P ? Ans. 390 Ibs. 27. A rectangular batten of fir, 6 feet in length, 2 inches broad, and 3 inches deep, is supported at its ends and can sustain a weight of 1, 100 Ibs. when hung at the centre. If the load were equally distributed instead of being hung at the centre, how much would the bar support ? Ans.
Сторінка 216 - Ans. 100 ft.-lbs. ; 25 Ibs. 8. Friction is neglected, and it is found that a force acting horizontally will move 10 Ibs. up 5 ft. of an incline rising I in 4. Find the work done, and find also the force parallel to the plane which will just support the weight of 10 Ibs. Ans.
Сторінка 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.

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