Principles of Mechanics: Rewritten and EnlargedLongmans, Green, and Company, 1889 - 356 стор. |
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Загальні терміни та фрази
action angle angle of repose angular angular velocity apparatus axis axle balance beam body Boyle's law brake centre of gravity coefficient of friction compressed crank cubic curve cylinder depth described diagram diameter direction disc distance drawing energy engine equal equilibrium exerted falling feet per second fluid foot-pounds forces acting friction fulcrum heat Hence inches of mercury inclined inclined plane increase lever lifting liquid load mass measure mechanical mercury minute molecules motion moving P₁ parallel forces particles perpendicular piston plunger pound weight pounds pressure principle Prop pull pulley pump quantity radius represented resistance rest resultant revolutions per minute rotation round Science Exam screw shaft side solid space specific gravity square inch steam straight line string supported surface temperature tons triangle tube valve vertical vessel volume weight wheel
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Сторінка 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.
Сторінка 86 - 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'.
Сторінка 198 - The specific gravity of a gas is the ratio of the weight of a given volume of the gas to that of an equal volume of air at the same temperature and pressure. The standard temperature is 60° F., and the pressure is that capable of sustaining 30 inches of mercury.
Сторінка 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.
Сторінка 77 - 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.
Сторінка 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.
Сторінка 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...
Сторінка 200 - 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...
Сторінка 75 - 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...