The Mathematical Principles of Mechanical Philosophy: And Their Application to the Theory of Universal GravitationJ. & J. J. Deighton, 1841 - 598 σελίδες |
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Άλλες εκδόσεις - Προβολή όλων
Συχνά εμφανιζόμενοι όροι και φράσεις
accelerating force angle arch attraction axes axis B₁ beam calculate catenary centre of gravity co-ordinates coefficient conditions of equilibrium consequence constant cos² couple curve determine direction distance disturbing force dt dt dx dy ecliptic ellipse equal equations of motion equilibrium extrados forces acting formulæ friction given Hence horizontal impulsive forces integrate invariable plane law of attraction longitude magnitude mass measured molecular forces Moon Moon's move nodes orbit P₁ P₂ parallel particle perihelion perpendicular plane points of application position pressure principle PROP pullies quantities ratio resolved respect resultant rigid body shew sin² spheroid suppose surface syzygy vertical Virtual Velocities voussoirs w₁ w₂ weight Y₁
Δημοφιλή αποσπάσματα
Σελίδα 533 - D'Alembert, was the Precession of the equinoxes and the Nutation of the earth's axis, according to the theory of gravitation.
Σελίδα 505 - A uniform ladder, 10 feet long, rests with one end against a smooth vertical wall and the other on the ground, the coefficient of friction between the ladder and the ground being J.
Σελίδα 523 - Let us express a in terms of the ratio of the centrifugal force at the equator to the equatorial gravity. Call this ratio m, which is small in the case of the earth, being of the same order as g.
Σελίδα 4 - Weight is the name given to the pressure which the attraction of the Earth causes a body to exert on another with which it is in contact.
Σελίδα 139 - Gravitation is, that every particle of matter attracts every other particle with a force which varies directly as the mass of the attracting particle, and inversely as the square of the distance.
Σελίδα 71 - The portions of the lever into which the fulcrum divides it are called the arms of the lever : when the arms are in the same straight line, it is called a straight lever, and in other cases a bent lever.
Σελίδα 6 - If two forces act on a body in opposite directions their resultant is equal to their difference and acts in the direction of the greater; thus two forces acting in opposite directions and equal to 9 and 4 Ibs.
Σελίδα 231 - Hence the orbit described about this centre of force will be an ellipse, parabola, or hyperbola according as the velocity is less than, equal to, or greater than that from infinity.
Σελίδα 73 - ... grate. Scissors, shears, nippers, pincers, and other similar instruments are composed of two levers of the first kind; the fulcrum being the joint or pivot, and the weight the resistance of the substance to be cut or seized ; the power being the fingers applied at the other end of the levers. The brake of a pump is a lever of the first kind; the pump-rods and piston being the weight to be raised.
Σελίδα 554 - ... the orbit of a planet, whose periodical revolution is performed in the same time as the sun's rotary motion about its axis, or in twenty-five days and a half : therefore it does not extend so far as the orbits of Mercury and Venus, and we know that the zodiacal light extends much beyond them. (2). " The ratio of the polar to the equatorial diameter of the solar atmosphere cannot be less than...