ما يقوله الناس - كتابة مراجعة
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acceleration acting angular momentum angular velocity applied approximately Article axes balance bars beam breadths called centre of gravity circular coefficient comparative motion components connected points cord couple coupling rod crank arm cross-section curve cylinder denote diameter divided driving point epicycloids epitrochoids equal and opposite equation exerted expressed factor of safety figure fluid foot-pounds frame friction given axis given instant inertia instantaneous axis intensity interval joint length line of action line of connection load machine mass mechanism moment of inertia moving pieces multiplied ordinates pair of points parallel forces perpendicular distance piston pitch circle pitch surface polygon position pressure principles produced proportional pulleys radius ratio rectangular relatively represented resistance respectively resultant right angles rigid body rotating piece screw shafts shearing shearing stress square straight line stress threads tion traversing truss unit velocity-ratio vertical weight wheel
الصفحة 219 - The i:ni. u u. . of a machine is a fraction expressing the ratio of the useful work to the whole work performed, which is equal to the energy expended. The limit to the efficiency of a machine is unity, denoting the efficiency of a perfect machine in which no work is lost. The object of improvements in machines is to bring their efficiency as near to unity as possible.
الصفحة 107 - Each of the three forces is equal and opposite to the resultant of the other two; and each pair of forces are equal and opposite to the components of the third. Hence this rule serves to resolve a given force into two parallel components acting in given lines in the same plane.
الصفحة 107 - ... the ratio of the mass of a given volume of the substance to the mass of an equal volume of water, in which case it is equal to the specific gravity.
الصفحة 227 - ... the friction of the water in the pumps and pipes, the friction of the plungers, pistons, valves, and mechanism, and the resistance of the air pump and other parts of the engine. For example, the useful work of a marine steam engine in a given time is the product of the resistance opposed by the water to the motion of the ship, into the distance through which she moves : the lost work is that performed in overcoming the resistance of the water to the motion of the propeller through it, the friction...
الصفحة 4 - B sin (A — B) = sin A cos B — cos A sin B cos (A + B) = cos A cos B — sin A sin B...
الصفحة 107 - If three forces acting on a particle keep it in equilibrium, each is proportional to the sine of the angle between the other two.