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If a rotating frame is chosen so that just the angular position of an object is held fixed, more complicated motion, such as elliptical and open orbits, appears because the centripetal and centrifugal forces will not balance.
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If and rotating
If the vertex is at Af, and if the interior of C is on the left as one moves in the direction of increasing t, then every such corner can be found from the curve obtained by rotating C clockwise through 90-degrees about the vertex.
If objects are seen as moving within a rotating frame, this movement results in another fictitious force, the Coriolis force ; and if the rate of rotation of the frame is changing, a third fictitious force, the Euler force is experienced.
If F ( r ) represents gravity, it is a negative term proportional to 1 / r < sup > 2 </ sup >, so the net acceleration in r in the rotating frame depends on a difference of reciprocal square and reciprocal cube terms, which are in balance in a circular orbit but otherwise typically not.
If the spheres only appear to rotate ( that is, we are watching stationary spheres from a rotating frame ), the zero tension in the string is accounted for by observing that the centripetal force is supplied by the centrifugal and Coriolis forces in combination, so no tension is needed.
If the spheres really are rotating, the tension observed is exactly the centripetal force required by the circular motion.
If the rotor disk is to be tilted forward ( to gain forward velocity ), its rotation requires that the downward net force on the blade be applied roughly 90 degrees ( depending on blade configuration ) before, or when the blade is to one side of the pilot and rotating forward.
If the rotating body is symmetrical and its motion unconstrained, and, if the torque on the spin axis is at right angles to that axis, the axis of precession will be perpendicular to both the spin axis and torque axis.
If board symmetries are taken into account, two games are considered the same if rotating and / or reflecting the board makes one of the games into a copy of the other game.
If we rotate the rod again in the same directions so that it will have completed a 720 degrees rotation in total the strings can be untangled without rotating any part ( e. g. by " sliding " the rods and / or stretching the strings ).
If the globe is not rotating in an inertial frame, the pointer on top of the chariot will indicate the direction of swing of a Foucault pendulum that is traversing this latitude.
If protons flow back through the membrane, they enable mechanical work, such as rotating bacterial flagella.
If the distance between mirrors is h, the time between the first and second reflections on the rotating mirror is 2h / c ( c = speed of light ).
If the camera is fitted within a frame, this ' rig ' can be designed to rotate horizontally and vertically and to change the picture format from portrait to landscape by rotating the camera.
If that tiny new solid particle would be rotating, rather than just moving with the flow, then there is vorticity in the flow.
If it were rotating only 16 % faster, the star's gravity would provide insufficient centripetal force to hold it together, and it would tear itself apart.
If these stars are rotating slowly then they will produce a faint supernova, but if the star is rotating quickly enough then the fallback to the black hole will produce relativistic jets.
If the output voltage from the stationary armature coils drops due to an increase in demand, more current is fed into the rotating field coils through the voltage regulator ( VR ).
If a ball is placed at the peak of the dome, the situation is symmetrical with respect to rotating the wine bottle.
If the sensor is made to control a light behind a second Nipkow disk rotating synchronously at the same speed and in the same direction, the image will be reproduced line-by-line.
If the drive disc slows down or stops rotating, the teeth of the driven disc slip over the drive disc teeth and continue rotating, producing a characteristic clicking sound proportionate to the speed difference of the driven gear relative to that of the ( slower ) driving gear.
If the crankshaft on one bank of cylinders is made to rotate in the opposite direction of the crankshaft on the other bank, then the gyroscopic effects of the rotating components would be canceled.
If an excellent server is in square four, the player in square three often gets " stuck " not scoring any points because the players in one and two keep rotating, since the player in two repeatedly is unable to return four's serve.
If and frame
If you do use a cold frame be sure that its ventilation is adequate.
If he is not told which of four or five readings was meant for him, he can more readily assess each item in a larger frame: `` Does that statement really sound as if it were for me, significant in my particular life??
If the frame contains areas where nothing has moved, the system simply issues a short command that copies that part of the previous frame, bit-for-bit, into the next one.
If sections of the frame move in a simple manner, the compressor emits a ( slightly longer ) command that tells the decompresser to shift, rotate, lighten, or darken the copy: a longer command, but still much shorter than intraframe compression.
If it has a width of W pixels and a height of H pixels we say that the frame size is WxH.
If an interlaced video has a frame rate of 15 frames per second the field rate is 30 fields per second.
If we attribute its apparent rate of rotation entirely to rotation in an inertial frame, a different " flatness " is predicted than if we suppose part of this rotation actually is due to rotation of the Universe and should not be included in the rotation of the galaxy itself.
If that motion is seen in one frame, it will also appear that way in the other.
If the rule is interpreted as defining an inertial frame, then we have to be able to determine when zero net force is applied.
If the particle is moving at speed in the first frame of reference, in the second it is moving at speed
If it was filmed at 16 or 18 frame / s, there are a number of important respects in which it is quite unlike man's gait.
If the producers chose to reformat the entire show for the 16: 9 ratio, live-action footage would have to be recropped, widening the frame to the full width of the 35 mm negatives while reducing its height.
If there were really two different memory stores operating in this time frame, one could expect a discontinuity in this curve.
If the sender does not receive an acknowledgment before the timeout, it usually re-transmits the frame / packet until the sender receives an acknowledgment or exceeds a predefined number of re-transmissions.
If a receiver is connected to the system in the middle of a frame transmission, it ignores the data until it detects a new frame synchronization sequence.
If a contractor builds a " turnkey home " they frame the structure and finish the interior.
In the Panchatantra, stories are introduced as didactic analogies, with the frame story referring to these stories with variants of the phrase " If you're not careful, that which happened to the louse and the flea will happen to you.
If so, it then senses the medium continually until it becomes idle, and then it transmits the message ( a frame ).
If and is
If the circumstances are faced frankly it is not reasonable to expect this to be true.
If his dancers are sometimes made to look as if they might be creatures from Mars, this is consistent with his intention of placing them in the orbit of another world, a world in which they are freed of their pedestrian identities.
If a work is divided into several large segments, a last-minute drawing of random numbers may determine the order of the segments for any particular performance.
If they avoid the use of the pungent, outlawed four-letter word it is because it is taboo ; ;
If Wilhelm Reich is the Moses who has led them out of the Egypt of sexual slavery, Dylan Thomas is the poet who offers them the Dionysian dialectic of justification for their indulgence in liquor, marijuana, sex, and jazz.
If he is the child of nothingness, if he is the predestined victim of an age of atomic wars, then he will consult only his own organic needs and go beyond good and evil.
If it is an honest feeling, then why should she not yield to it??
If he thus achieves a lyrical, dreamlike, drugged intensity, he pays the price for his indulgence by producing work -- Allen Ginsberg's `` Howl '' is a striking example of this tendency -- that is disoriented, Dionysian but without depth and without Apollonian control.
If love reflects the nature of man, as Ortega Y Gasset believes, if the person in love betrays decisively what he is by his behavior in love, then the writers of the beat generation are creating a new literary genre.
If he is good, he may not be legal ; ;
If the man on the sidewalk is surprised at this question, it has served as an exclamation.
If the existent form is to be retained new factors that reinforce it must be introduced into the situation.
If we remove ourselves for a moment from our time and our infatuation with mental disease, isn't there something absurd about a hero in a novel who is defeated by his infantile neurosis??
If many of the characters in contemporary novels appear to be the bloodless relations of characters in a case history it is because the novelist is often forgetful today that those things that we call character manifest themselves in surface behavior, that the ego is still the executive agency of personality, and that all we know of personality must be discerned through the ego.
If he is a traditionalist, he is an eclectic traditionalist.
If our sincerity is granted, and it is granted, the discrepancy can only be explained by the fact that we have come to believe hearsay and legend about ourselves in preference to an understanding gained by earnest self-examination.
If to be innocent is to be helpless, then I had been -- as are we all -- helpless at the start.
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