Principles of Mechanics

Εξώφυλλο
Longmans, Green, 1883 - 352 σελίδες
 

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Δημοφιλή αποσπάσματα

Σελίδα 16 - 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 force to change that state.
Σελίδα 41 - 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.
Σελίδα 81 - If any number of forces, acting at a point, can be represented in magnitude and direction by the sides of a polygon taken in order, they will be in equilibrium.
Σελίδα 12 - In other words, velocity, when uniform, is measured by the space described in a unit of time ; when variable it is measured by the space which would be described in a unit of time, if the point retained throughout that unit the velocity which it has at the instant considered.
Σελίδα 79 - If three forces, acting at a point, be represented in magnitude and direction by the sides of a triangle taken in order, they will be in equilibrium...
Σελίδα 90 - Prop. To find the conditions of equilibrium of any number of forces acting in one plane upon different points of a rigid body. Let A be any point in the body, P! P2 . . . the forces acting on it, a, a 2 . . . the angles their directions make with a fixed line XAX'.
Σελίδα 32 - We have spoken of the gravitation measure of force as that wherein a force which will support w pounds of matter is called a force of w pounds ; and we now define the units of force and mass in order that the student may be able to compare the absolute and gravitation measures. Def. In gravitation measure, forces are measured by the weights they will support. The unit is a pound weight, whence a force which will support 3 pounds is represented by the number 3. Def. In gravitation measure the unit...
Σελίδα 208 - Art. 159), wherefore a surface of equal pressure is everywhere at the same depth below a horizontal plane, and is itself a horizontal plane. For a like reason, when any number of vessels containing the same liquid are in communication, the liquid stands at the same height in each vessel. Again, the common surface of two fluids that do not mix must be a surface of equal pressure, and the upper surface of the lighter fluid is a horizontal plane, therefore the common surface of two fluids that do not...
Σελίδα 172 - That the quantity of heat produced by the friction of bodies, whether solid or liquid, is always proportional to the quantity of force expended.
Σελίδα 206 - The specific gravity of a petroleum oil and of mixtures of petroleum products with other substances is the ratio of the weight of a given volume of the material at a temperature of 60° F.

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