| 单词 | axis of rotation |
| 例句 | Some flattened, squashing themselves along the axis of rotation where gravity is not balanced by centrifugal force. Cosmos 1980-01-01T00:00:00Z Have you ever thought, while watching a dancer move, about her axis of rotation, her surface area with respect to the floor or her changes in gravitational potential? Reviews: Colliding Particles, a Grim Duet and Channeling Martha Graham 2017-03-21T04:00:00Z Being so small, pulsars spin with enormous frequencies, emitting bright narrow beams of radio emission along their axis of rotation. Pulsars may make dark matter glow 2023-10-06T04:00:00Z Instead Earth's so-called "True North Pole" is whichever place that is northernmost on the planet, a fact determined on where the globe's axis of rotation meets its surface. Humans have changed the Earth's axis — and our GPS and satellite navigation systems need it to work 2023-06-21T04:00:00Z The Earth has lost enough groundwater to thirsty humans to measurably tilt the planet’s axis of rotation. Rampant Groundwater Pumping Has Changed the Tilt of Earth’s Axis 2023-06-21T04:00:00Z Through a process known as frame-dragging, the black hole causes the disk’s axis of rotation to swing round, or “precess.” Astronomers try to catch titanic black hole clashes in action 2023-04-25T04:00:00Z The lost moon, which they call Chrysalis, may also help explain the evolution of Saturn’s oddly tilted axis of rotation. Lost moon may have spawned Saturn’s rings 2022-09-14T04:00:00Z Notice in the figure that both point along the axis of rotation. College Physics for AP Courses 2015-08-12T00:00:00Z The familiar cycle of the seasons results from the 23.5° tilt of Earth’s axis of rotation. Astronomy 2016-10-13T00:00:00Z Torque τ measures the tendency of a force to produce rotation about an axis of rotation. Calculus, Volume 3 2016-03-30T00:00:00Z Whether any of that ancient fluid persists is something InSight will test by using radio equipment to observe how Mars shifts on its axis of rotation. Nasa mission to target 'Marsquakes' 2018-05-04T04:00:00Z Thanks to its proximity and the fact that its axis of rotation points in Earth's direction, astronomers are able to get a face-on view of the developing planetary system. Star's dust cloud gives birth to giant planet - BBC News 2016-09-14T04:00:00Z Only the force component perpendicular to the line connecting the axis of rotation and the point of application of the force results in a torque about that axis. College Physics for AP Courses 2015-08-12T00:00:00Z As we discussed in Observing the Sky: The Birth of Astronomy, Earth’s axis of rotation defines the locations of its North and South Poles and of its equator, halfway between. Astronomy 2016-10-13T00:00:00Z Then, we can represent torque by a vector oriented along the axis of rotation. Calculus, Volume 3 2016-03-30T00:00:00Z Albert Einstein’s general theory of relativity predicts that a rotating object will produce gravitational waves as long as it is not perfectly symmetrical around its axis of rotation. Citizen scientists take on latest gravitational-wave data 2016-03-08T05:00:00Z The passage around the star is not a perfect circle and over time our planet's axis of rotation also rocks back and forth. Carbon emissions 'postpone ice age' - BBC News 2016-01-13T05:00:00Z System A consists of two of the larger disks rigidly connected to each other with a common axis of rotation. College Physics for AP Courses 2015-08-12T00:00:00Z Another complication is that Earth’s axis of rotation is not perpendicular to the plane of its revolution. Astronomy 2016-10-13T00:00:00Z Some of that matter would be squirted out along the axis of rotation, forming the jets seen in radio observations of quasars. The most beautiful theory 2015-11-25T05:00:00Z For Saturn, the effect is accentuated by the planet’s size — centrifugal forces are stronger the farther one moves from the axis of rotation — and rapid spin. About time 2015-03-24T04:00:00Z The data suggest that in the past, the moon’s axis of rotation—and hence its poles—shifted. Lopsided ice on the moon points to past shift in poles 2015-03-19T04:00:00Z Yet the tilt of the Earth’s axis of rotation relative to the sun results in seasons. College Physics for AP Courses 2015-08-12T00:00:00Z The robot's center of mass is lower than the axis of rotation, stabilizing it and eliminating the need for sensors and control algorithms to keep it upright. This is the world's fastest robot on legs 2014-05-22T04:00:00Z Those massive planets can pull a world’s axis of rotation with their huge gravitational effects, changing the orientation within tens to hundreds of thousands of years – a mere blink of an eye in geological terms. Drunkenly Wobbling Planets Could Make Good Homes For Humans 2014-04-16T17:26:00Z Essentially the particle behaved like the world's smallest gyroscope, stabilising its motion around the axis of rotation. 'Fastest spinning object' created 2013-08-28T10:32:25Z This is tilted at an angle because the Earth’s axis of rotation is at an angle, 23.5 degrees. Vernal Equinox Marks First Day of Spring Today 2013-03-20T17:45:05.467Z System B consists of one of the larger disks and a number of the smaller disks rigidly connected with a common axis of rotation. College Physics for AP Courses 2015-08-12T00:00:00Z In five-dimensional space, there are two natural flat planes to look at, each one perpendicular to the axis of rotation and to each other. How to Make Impossible Wallpaper 2013-03-08T16:15:00.573Z The counterpoise w balances the head about its axis of rotation. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 2 "Hearing" to "Helmond" 2012-04-25T02:00:53.567Z The cubit contains twenty-five of what he calls "Pyramid inches," and fifty of these are just equal to one ten-millionth part of the earth's axis of rotation! From Egypt to Japan 2012-04-19T02:00:28.147Z Now consider the resultant angular velocity at any point of the fluid, and draw a short line through that point in the direction of the axis of rotation. Lord Kelvin An account of his scientific life and work 2012-04-06T02:00:32.097Z Angular velocity has only two directions with respect to the axis of rotation—it is either clockwise or counterclockwise. College Physics for AP Courses 2015-08-12T00:00:00Z The axis of rotation is inclined away from the sun. Webster's Unabridged Dictionary (2nd 100 Pages) 2012-03-24T02:00:19.387Z The axis of rotation AB bears a rigidly attached rod DBC inclined to it at an angle equal to the sun’s polar distance. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 2 "Hearing" to "Helmond" 2012-04-25T02:00:53.567Z Recent research at Mount Wilson makes the sun a great magnet; and its magnetic axis is inclined at an angle of 6 degrees to the axis of rotation, around which it revolves in 32 days. Astronomy: The Science of the Heavenly Bodies 2012-03-17T02:01:02.630Z That line may be continued from point to point, and will coincide at every one of its points with the direction of the axis of rotation there. Lord Kelvin An account of his scientific life and work 2012-04-06T02:00:32.097Z Hence it is seen that the magnetic force is properly represented by the rate of rotation of the wheels, and its direction by the axis of rotation. Scientific American Supplement, No. 648, June 2, 1888. 2011-12-26T03:00:15.410Z But because it is farther from the axis of rotation, the middle of a jump rope travels faster than the ends, so it experiences greater drag. Jumping Rope by the Numbers 2011-11-02T15:57:00Z AB is the axis of rotation, BC an adjustable rod as in Foucault’s construction, and BD is another rod which can be set to the direction in which the rays are to be reflected. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 2 "Hearing" to "Helmond" 2012-04-25T02:00:53.567Z Uranus orbits nearly on its side; its axis of rotation is skewed by 98 degrees relative to an ordinary upright orientation, perpendicular to the orbital plane. Double Impact: Did 2 Giant Collisions Turn Uranus on Its Side? 2011-10-07T10:45:05.563Z One of the cosmical relations of our planet which has been more especially prominent in geological speculations relates to the position of the earth’s axis of rotation. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6 "Geodesy" to "Geometry" 2011-09-19T02:00:10.473Z These appearances he 410 referred with great acuteness to the slight inclination of the sun’s axis of rotation to the plane of the ecliptic. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 "G" to "Gaskell, Elizabeth" 2011-08-24T02:00:20.690Z Purkinje noticed that the position of the imaginary axis of rotation depends on the axis around which the head revolves. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 7 "Equation" to "Ethics" 2011-02-27T03:00:31.973Z The woman’s force had counted as inertia of rotation, and her axis of rotation had been the cradle and the family. The Invisible Censor 2011-01-29T03:00:20.267Z Precise radio measurements could pin down wobbles in Mars’ axis of rotation, and that could tell whether the center of the planet is liquid or solid. 2010-01-27T07:51:00Z Then came his memoir, “On the influence of geological changes in the earth’s axis of rotation.” Rustic Sounds and Other Studies in Literature and Natural History When the differential equations of the earth’s rotation are integrated, there appear two arbitrary constants, representing the position of any assigned epoch of the axis of rotation relative to that of figure. Astronomical Discovery Evans by a shifting of the axis of rotation of the earth. The Origin of the World According to Revelation and Science In all cases the axis of rotation must be at right angles to the line of flight, and the more accurately this condition is complied with, the more marked the effect. St. Nicholas Magazine for Boys and Girls, Vol. 8, May 1878, No. 7. An Illustrated Magazine for Young Folks Changes in the position of the earth's axis of rotation. Island Life Or the Phenomena and Causes of Insular Faunas and Floras The earth's axis of rotation is inclined to the plane of her orbit of revolution round the sun. History of the Intellectual Development of Europe, Volume I (of 2) Revised Edition Theory then shows that the axis of rotation will revolve round that of figure, in a period of 306 days, and in a direction from west toward east. Astronomical Discovery You could move fast indoors, under the low weight which became lower as you approached the axis of rotation, with no fear of tumbling off. Industrial Revolution The earth's equatorial protuberance, being acted on by the attraction of the sun and moon, must disturb its axis of rotation in a calculated manner; and thus is produced the precession of the equinoxes. Pioneers of Science The axis of rotation was found to be much more bowed towards the orbital plane than that of the earth, the equator making with it an angle of 53° 11′. A Popular History of Astronomy During the Nineteenth Century Fourth Edition The attraction of external bodies is able to grasp this protuberance, and thereby force the earth's axis of rotation to change its direction. The Story of the Heavens The inclination of the axis of rotation of this globe upon the plane of its orbit is much the same as our own. Astronomy for Amateurs Again, Jupiter's axis of rotation is nearly perpendicular to the plane of the ecliptic, while that of Mars is inclined at an angle of fifty-nine degrees forty-two minutes. A Theory of Creation: A Review of 'Vestiges of the Natural History of Creation' The earth's equatorial protuberance, being acted on by the attraction of the sun and moon, must disturb its axis of rotation in a calculated manner; and thus is produced the precession of the equinoxes. Pioneers of Science The question of a possible mobility in the earth's axis of rotation has often been mooted. A Popular History of Astronomy During the Nineteenth Century Fourth Edition The phenomena of precession and nutation depend on movements of the earth itself, and not on movements of the axis of rotation within the earth. The Story of the Heavens His axis of rotation remains almost vertical throughout the course of his year, and results in the complete absence of climates and seasons. Astronomy for Amateurs So, also, if the axis of rotation is horizontal instead of vertical, and the greatest resistance is made to come on top, the ball will curve downward, or "drop." Base-Ball How to Become a Player The arc of rotation is 82�, and the axis of rotation is 13 ft. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria" The axis of rotation is thus represented by the line PP′. Outlines of a Mechanical Theory of Storms Containing the True Law of Lunar Influence The same observer shows that the axis of rotation of Mercury is perpendicular to the plane of the orbit. The Story of the Heavens The dipping of Saturn's axis of rotation is much the same as our own. Astronomy for Amateurs Differences in the amount of variation at different times will largely depend upon the position of the earth with respect to the axis of rotation. Other Worlds Their Nature, Possibilities and Habitability in the Light of the Latest Discoveries In the Robinson anemometer the axis of rotation is vertical, but with this subdivision the axis of rotation must be parallel to the direction of the wind and therefore horizontal. Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1 From the invariability of the axis of rotation, we must conclude that whatever form is the true form, it is one of equilibrium. Outlines of a Mechanical Theory of Storms Containing the True Law of Lunar Influence The disc C serves the purpose of bringing the center of gravity in the axis of rotation. Experimental Determination of the Velocity of Light Made at the U.S. Naval Academy, Annapolis The motion of the piece necessary to aim it vertically is effected around this axis of rotation. Scientific American Supplement, No. 531, March 6, 1886 Each pair of opposite pistons was secured together by a rigid connecting rod, connected to a pin on a rotating crankshaft which was mounted eccentrically to the axis of rotation of the cylinders. A History of Aeronautics In 1966 I built an aerial array consisting of 8 nine-element Yagis for 2 metres with the axis of rotation pointing to the North Star enabling me to track the Moon automatically. The Dawn of Amateur Radio in the U.K. and Greece: a personal view It had long been believed that that tremendous accumulation unbalanced the globe and was the principal cause of the unsteadiness of the earth's axis of rotation. The Second Deluge The part corresponding to C, in Foucault's apparatus, was furnished with three vertical screws, by moving which the axis of figure was brought into coincidence with the axis of rotation. Experimental Determination of the Velocity of Light Made at the U.S. Naval Academy, Annapolis Twelve years ago a suspicion which had long been entertained that the earth's axis of rotation varied a little from time to time was verified by Chandler. Side-Lights on Astronomy and Kindred Fields of Popular Science The woman's force had counted as inertia of rotation, and her axis of rotation had been the cradle and the family. The Education of Henry Adams The shrinkage will, in ordinary parlance, bring the weights nearer to the axis of rotation. Darwin and Modern Science The snout forms a sort of stalk, and between the stalk and the axis of rotation the surface is somewhat flattened. Darwin and Modern Science He finds that the stalk end of the pear-like section continues to protrude more and more, and the flattening between it and the axis of rotation becomes a constriction. Darwin and Modern Science The root is oblique to the axis of rotation, and the extreme tip projects beyond that axis. Darwin and Modern Science Line AA represents the axis of rotation, T is the tip of the root just above the line AA, and B is the region just below line AA in which curvature takes place. Darwin and Modern Science As this goes on the equator of these Jacobian figures becomes more and more elliptic, so that the shape is considerably elongated in a direction at right angles to the axis of rotation. Darwin and Modern Science As it cooled and contracted the symmetry round the axis of rotation must have become unstable, through the effects of gravitation, assisted perhaps by the increasing speed of rotation. Darwin and Modern Science |
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