Mechanics and Hydrostatics for BeginnersUniversity Press, 1905 - 290 páginas |
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Termos e frases comuns
acceleration algebraic sum attached balance beam Boyle's Law centre of gravity component couple cubic foot cylinder density depth displaced fluid diving bell equal and opposite equilibrium feet per second find the distance Find the sp find the tension floats fluid force equal forces acting friction fulcrum G₁ given grammes Hence horizontal plane Hydrometer immersed inches inclined plane lamina length line of action liquid magnitude and direction mass mercury middle point miles per hour moments motion moving parallel forces parallelogram Parallelogram of Forces particle perpendicular piston placed point of application portion poundals pulleys radius respectively rest right angles rigid body scale-pan shew sides smooth specific gravity square string passing supported surface suspended T₁ Theorem three forces triangle tube uniform rod unit valve velocity vessel volume W₁ W₂ water barometer zero
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Página 136 - 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.
Página 169 - If a moving point possess simultaneously velocities which are represented in magnitude and direction by the two sides of a parallelogram drawn from a point, they are equivalent to a velocity which is represented in magnitude and direction by the diagonal of the parallelogram passing through the point.
Página 13 - 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...
Página 136 - Change of motion is proportional to the impressed force and takes place in the direction of the straight line in which the force acts.
Página 186 - The pressure at any point of a fluid at rest is the same in all directions. This may be proved experimentally by a modification of the experiment of the last article. For suppose any one of the pistons, D, to be so arranged that it may be turned into any other position, ie so that its plane may be made parallel to the planes of either A, B, or C or be made to take any other position whatever.
Página 181 - As a simple example consider the case of a particle tied to one end of a string, the other end of which is attached to a point of a smooth horizontal table.
Página 38 - Prove that the algebraic sum of the moments of two concurrent forces about any point in their plane is equal to the moment of their resultant about the same point.
Página 204 - S is the area of the plane surface and z is the depth of its centre of gravity below the surface of the liquid, the pressure of the air being neglected.
Página 41 - If the point 0, about which the moments are taken, lies on the resultant, the moment of the resultant about the point vanishes. In this case the algebraic sum of the moments of the component forces about the given point vanishes, ie The moments of two forces about any point on the line of action of their resultant are equal and of opposite sign. The student will easily be able to prove this theorem independently from a figure ; for, in Art.
Página 6 - If two forces act on a body in the same direction their resultant is clearly equal to their sum ; thus two forces acting in the same direction, equal to 5 and 7 Ibs.