... 23a. The Centrifugal Force . ... You can also view this problem from the point of view of the outside world, using the centripetal force, but it is not as easy. At point A, on the top of the loop, both gravity and the centripetal force point downwards. ... A car going around a loop, with radius R and velocity V, is accelerating at a rate of V 2 /R towards the center (as long as it stays on the rails), and is therefore subject to a centripetal force mV 2 /R, also directed to the center. ...

... The choice of which type of electricity is called "positive" and which "negative" was made around 1750 by Ben Franklin, early American scientist and man of many talents (the stamp on the left commemorates his role as first US postmaster--and colonial postmaster before that). ... Franklin knew of two types of electric charge, depending on the material one rubbed. ... Later, when electric batteries were discovered, scientists naturally assigned the direction of the flow of current to be from (+) to (-...

slitless -- Extract a spectrum from a direct/GRISM image pair slitless image grism output PARAMETERS . ... A two dimensional direct image to be used to select an object. grism . A two dimensional GRISM image containing slitless spectra of objects present in the direct image. output . ... Toggle whether or not a background estimate is subtracted from the extracted object spectrum. mingood = INDEF . Pixels of the grism image with values smaller than this are ignored. maxgood = INDEF . ...

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... Magnetic fragment behaviour Note A bipolar region was involved. ... Negative fragments form the arrowhead and positive ones distribute in the south-north direction. ... The middle part of the positive fragments moves towards the western part of the negative fragments. A few negative fragments in the west move towards the southern part of the positive fragments. ... Meanwhile, the western part of the negative fragments moves towards the southern part of the positive fragments. ...

... When feed is rotated over the tertiary: . ... z is toward the tertiary from the focus position . ... angle : Center of rotation is about the optical axis. range 0 to 360 degrees (minus a few degrees for the limits) . ... CW when sitting on the tertiary looking up at the dipoles. radius : moves in the x,y plane along the direction that the angle currently points . ... Dipole positions : . ... D1 is at the center of the dipole array. processing: x101/projects/byuPhAr/idl/doplotoff.pro . ...

Next: Rotation Periods of ZAMS stars Previous: T Tauri Stars . ... The first attempts to directly measure periodic modulation of T Tauri stars occurred in the early 1980s. Rydgren & Vrba (1983) observed four PMS stars using photoelectric photometry over a period of seven consecutive photometric nights. ... Because the spot lifetime is much longer than the rotational period, the observed effect will be a modulation of the light from the star synchronously with the rotation period. ...

Coordinate Systems used for spacecraft trajectory description: . ... The HGI coordinates are Sun centered and inertially fixed with respect to an X-axis directed along the intersection line of the ecliptic and solar equatorial planes. ... Cometocentric (solar) Ecliptic Coordinate System (CSE) . ... CSE coordinate system for the SC POSITION: axis origin at comet center, X-axis to the SUN, Z-axis to ecliptic north pole, (X,Y)-plane is parallel to the ecliptic plane. ...

Please find below methods for getting to Cambridge by air , rail , Eurostar or coach . ... London Stansted Airport: This is the closest major airport, about 25 miles from Cambridge (40 minutes by car). ... The times of trains between Stansted Airport and Cambridge can be found on the National Rail website. ... A fast train service, the Heathrow Express , connects the airport with London Paddington station. ... A direct train service connects the airport with Kings Cross station. ...

Bigbang Forum Message . Forums: . ... Discussion Forums | Big Bang | Post . ... Gravity The Big BANG . Forum List | ... Post Message | ... You Do hear of Black Holes Capturing Light?--its Simply because Science has NOT advanced enough to Know? what Happens to Light? ... www.astronomy.net . About Astronomy Net | Advertise on Astronomy Net | ... Forum posts are Copyright their authors as specified in the heading above the post. "dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...

... Forum . ... Recent Topics . ... MAO main . ... Fw: Actions directed to stop Russian aggression against Ukraine . ... Subject: Re: Actions directed to stop Russian aggression against Ukraine . ... Actions directed to stop Russian aggression against Ukraine" and I hope . ... around Ukraine is very dangerous indeed and who thinks that together we . ... Board Categories MAO main - Info - MAO - news - Flame Technical - Technical Support(Forum)(пўпµя…пїпѕпґпґпµяЂп¶пєп°(п¤пѕяЂяѓпј)) . ... MAO NASU . ...

... Now shining in the west as bright "stars" in the night sky, are all five planets of the solar system known to ancient astronomers - Mercury, Venus, Mars, Saturn, and Jupiter. ... Pictured above is the largest ball of stars in our Galaxy. ... One of the best studied examples of the jumble of star clusters, gas, and dust clouds produced by such a cosmic train wreck is the interacting galaxy pair NGC 4038 / NGC 4039, the Antennae Galaxies, only sixty million light-years away. ...

Next: Data and Image Processing . ... The EKH method is then a division in the Fourier plane by this sine function, which is equivalent to a convolution in the image plane by the Fourier transform of this cosec function (an infinite set of delta functions separated by the beam throw, positive on one side of the origin and negative on the other). ... Figure 1: EKH restoration of simulated data: image plane (left), Fourier plane (right) illustrating EKH sine-wave pattern of noise. ...

... Apache HTTP Server Version 2.4 . ... Session encryption support . ... session_crypto_module . ... The session will be encrypted with the given key. Different servers can be configured to share sessions by ensuring the same encryption key is used on each server. ... The SessionCryptoPassphrase directive specifies the keys to be used to enable symmetrical encryption on the contents of the session before writing the session, or decrypting the contents of the session after reading the session. ...

... SUN MOON MERCURY VENUS MARS, JUPITER SATURN . ... Mars . ... Previously understood that magnetic fields were directly related to rotation, so when I read that Mars, like Venus, didn't have one, my understanding crumbled. What exactly causes magnetic fields in planets? ... RELATED TOPICS: MAGNETIC FIELD . Planetary magnetic fields are definitely related to rotation, but directly not so much. ... Get instant access to subscriber content on Astronomy.com! ...

... Bad Astronomy . ... Every few months, one of a series of questions comes up on the USENET group sci.astro involving tides, or the rotation of the Moon, or the recession of the Moon from the Earth. ... Why the Moon's rotation period is the same as the length of time it takes to orbit the Earth (same as number 1, but phrased differently). ... But when this happens, the time it takes for the Earth to rotate once will be slowed to exactly the same time it takes for the Moon to go around the Earth once! ...

Villains and Heroes of Lights and Lighting Fixtures . If we are to reduce the effects of light pollution, we must learn about the types, both good and bad, of fixtures used in outdoor lighting. ... In fact, this type of fixture is often chosen for this very reason. ... Although these lamps are not very energy efficient, and they are often found in older, inefficient fixtures that enhance light pollution, they still exist in great abundance in most locations and are still sold by the millions. ...

Stellarium 0.12.3 . ... TextParams Struct Reference . Parameters specifying how to draw text. ... TextParams (const float x, const float y, const QString &string) . Construct TextParams with default parameters. ... TextParams ( Vector3 < F > &position3D, StelProjectorP projector , const QString &string) . Construct TextParams to draw text at a 3D position, using specified projector. ... string љ . ... Text string to draw. ... The required string parameter is also set, as is the projector. ...

... Parameters of the Moon-perturbed orbit . ... From orbits consistent with this limitation and with the date of the launch October 1, 2000 as an example, an orbit was selected with apogee directed to the North Galactic pole at the begining and rotation of orbit plane was maximized. The initial state vector is given in the inertial coordinate system in epoch J2000.0. ... The orbit has initial perigee radius Rp=7000.0 km, initial apogee radius Ra=343000.0 km and initial period T=8.453 days. ...

... Centrifuge . ... Technical description centrifuge TSF-7 . ... If during rotation the operator feels badly, the hand will release, and the centrifuge will stop. ... Tests for cosmonauts: . ... Services / Centrifuge: General description Technical description Photo gallery Price . Info: Industry news On-line Data Company ATLAS news Events We in press Contact . Copyright 2000-2016 ATLAS Aerospace . ...