Mechanics |
Sommario
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Parole e frasi comuni
acting angle apparatus applied atmosphere attached axis axle balance wheel ball body carbonic acid centre of gravity centrifugal force column compressed consequently contraction cord cylinder descend diagonal diameter dilatation diminished direction distance effect elasticity equal equilibrium example expressed fall feet fixed fluid friction greater heat horizontal immersed imparted inches inches of mercury inclined plane increased latent heat length less lever liquid machine magnitude manner mass matter mechanical mercury metal momentum motion moving force moving power oscillation parallel particles passing pendulum perpendicular pipe piston placed position power and weight pressure principle produced proportion pulley quantity raised represented in fig resistance rest revolve rope round screw shaft shown in fig side simple machines solid space specific gravity specific heat stratum string suppose surface suspended temperature thermometer tion tube upwards valve vapour velocity vertical vessel volume wheel
Brani popolari
Pagina 216 - as inclined planes, and loads drawn upon them in carriages, regarded in reference to the powers which impel them, are subject to all the conditions which have been established for inclined planes. The inclination of the road is estimated by the height corresponding to some proposed length : thus we say, a road rises one foot
Pagina 167 - The manufacture of shot presents one of the most striking examples of this phenomenon in the arts. The lead, in a state of fusion, is poured into a sieve, the meshes of which determine the magnitude of the shot, at the height of about two hundred feet from the ground. The shower of liquid metal, after
Pagina 110 - in., will be the height required. In the same manner, if it be required to determine what space a falling body would descend through in the fifth second of its motion, we take, in the second column of the table, the number opposite 5 seconds, which is 9; we multiply 16 ft.
Pagina 22 - which are so small that millions of them collected into one mass would not exceed the bulk of a grain of sand, and a thousand might swim side by side through the eye of a needle. The shells of these creatures are found to exist fossilized in
Pagina 91 - force impressed upon it. SECOND LAW. Every change of motion must be proportional to the impressed force, and must be in the direction of that straight line in which the force is impressed. THIRD LAW. Action must always be
Pagina 194 - principles, the manner in which a load borne on poles is distributed between the bearers may be ascertained. As the efforts of the bearers and the direction of the weight are always parallel, the position of the poles relatively to the horizon
Pagina 247 - Attached to the middle of CD, by a joint, is a rod, which is the means of imparting the effect of the power to the crank. This rod is driven by an alternate motion like the brake of a pump. The bar cD is carried with a circular motion round the axis A F. Let the machine viewed in the direction
Pagina 135 - When a porter carries a load, his position must be regulated by the centre of gravity of his body and the load taken together. If he bore the load on his back, the line of direction would pass beyond his heels, and he would fall backwards. To bring the centre of gravity over his feet, he accordingly leans forward (Jig.
Pagina 22 - A thread of a spider's web, measuring four miles, will weigh very little more than a single grain ! Every one is familiar with the fact, that the spider spins a thread, or cord, by which his own weight hangs suspended. It has been ascertained that this thread is composed of about six thousand filaments. 54.
Pagina 188 - lever of this kind with equal arms, in which the power and weight are necessarily equal. The dishes are suspended by chains or cords from points precisely at equal distances from the fulcrum, and being themselves adjusted so as to have precisely equal weights, the