Elementary Physiography: An Introduction to the Study of NatureLongmans, Green & Company, 1899 - 427 σελίδες |
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Σελίδα 39
... turn when moving rapidly , the rider is liable to be thrown on the outer side or the carriage over- turned , owing to the tendency of a moving body to continue its motion in a straight line . 31. Force . - Newton's first law of motion ...
... turn when moving rapidly , the rider is liable to be thrown on the outer side or the carriage over- turned , owing to the tendency of a moving body to continue its motion in a straight line . 31. Force . - Newton's first law of motion ...
Σελίδα 48
... turn quite freely about FIG . 23 . its point of suspension . Mark on the bar equal divisions from the centre , and at each division bore a small hole . Make several hooks of bent wire , and when necessary insert a hook into the hole ...
... turn quite freely about FIG . 23 . its point of suspension . Mark on the bar equal divisions from the centre , and at each division bore a small hole . Make several hooks of bent wire , and when necessary insert a hook into the hole ...
Σελίδα 49
... turn one of the hooks upside down . Attach a weight to this hook by a string passing over the pulley . The effect of the pulley , as we shall after- wards show , is merely to allow the weight to act upwards upon the rod , and does not ...
... turn one of the hooks upside down . Attach a weight to this hook by a string passing over the pulley . The effect of the pulley , as we shall after- wards show , is merely to allow the weight to act upwards upon the rod , and does not ...
Σελίδα 50
... turning about a fixed point called the fulcrum . The fulcrum may be an axle passing through the lever , or an edge upon which it rests . The portions of the lever measured from the fulcrum to the power and weight respectively are called ...
... turning about a fixed point called the fulcrum . The fulcrum may be an axle passing through the lever , or an edge upon which it rests . The portions of the lever measured from the fulcrum to the power and weight respectively are called ...
Σελίδα 55
... turn freely about an axle passing through its centre . The axle is supported by a framework called the block . In the groove a cord is placed , to one end of which the power is applied , whilst the other end is attached to the ...
... turn freely about an axle passing through its centre . The axle is supported by a framework called the block . In the groove a cord is placed , to one end of which the power is applied , whilst the other end is attached to the ...
Συχνά εμφανιζόμενοι όροι και φράσεις
acid altitude angle Antarctic Antarctic Circle Arctic Arctic Circle Atlantic atmosphere axis barometer body calcium carbonate called carbon celestial equator celestial sphere centre circle coast currents declination delta density deposits depth distance earth earth's orbit east ecliptic equal equator equatorial equinox evaporation Experiment fall fathoms feet flask force glacier globe heat Hence horizon inches increase iron land latitude lava length liquid magnet mass mercury meridian miles moon motion mountain move needle night north pole Northern Hemisphere OCEAN oxide oxygen parallel particles passing plane position pressure quantity rain rays regions right ascension rise river rocks rotation round side sidereal day silica solar day specific gravity spring stars stream substance sun's surface temperature thermometer Tropic Tropic of Cancer Tropic of Capricorn tube valley vapour velocity vernal equinox vertical volcano weight winds winter zenith
Δημοφιλή αποσπάσματα
Σελίδα 20 - Newton generalized the law of attraction into a statement that every particle of matter in the universe attracts every other particle with a force which varies directly as the product of their masses and inversely as the square of the distance between them; and he thence deduced the law of attraction for spherical shells of constant density.
Σελίδα 37 - 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.
Σελίδα 313 - A circle is a plane figure contained by one line, which is called the circumference, and is such, that all straight lines drawn from a certain point within the figure to the circumference are equal to one another.
Σελίδα 415 - All the rivers run into the sea; yet the sea is not full; unto the place from whence the rivers come, thither they return again.
Σελίδα 356 - The Ram, the Bull, the heavenly Twins, And next the Crab the Lion shines, The Virgin and the Scales ; The Scorpion, Archer and He-goat, The Man that holds the watering-pot And Fish with glittering tails.
Σελίδα 317 - The zenith distance of a body is its angular distance from the zenith, measured on the vertical circle passing through the body from 0° to 90°. It is the complement of the altitude.
Σελίδα 258 - When there is not enough of clouds and wind to afford this degree of protection, dew begins to form, and by preventing the temperature of any leaf or flower from sinking below the dew-point, saves them all from destruction, unless, as when hoar-frost appears, the dew-point itself is below the freezing-point.