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# Topic: Directly proportional

###### In the News (Sun 19 May 13)

 Directly Proportional Encyclopedia Article, Definition, History, Biography   (Site not responding. Last check: 2007-11-05) The circumference of a circle is proportional to its diameter, with the constant of proportionality equal to π. On a map drawn to scale, the distance between any two points on the map is proportional to the distance between the two locations the points represent, with the constant of proportionality being the scale of the map. The amount of force acting on a certain object from the gravity of the Earth at sea level is proportional to the object's mass, with the gravitational constant being the constant of proportionality. www.karr.net /encyclopedia/Directly_proportional   (770 words)

 Predator-Prey with Child-care   (Site not responding. Last check: 2007-11-05) The population of adults stabilizes at n/u, which means that the number of adults (a) is directly proportional to the death rate of the predators and inversely proportional to the predation rate. So, c is directly proportional to the birth rate of the prey and the death rate of the predators and inversely proportional to the predation rate and the (growing up + death) rate. Here, it is again directly proportional to the prey's birth rate and inversely proportional the sum of the two "death" rates (growing up and real death), and also directly proportional the to the number of adults. www.geom.uiuc.edu /education/UMTYMP/CalcIII/1994/StudentLabs/Mutualism/child6.html   (302 words)

 [No title]   (Site not responding. Last check: 2007-11-05) The control effort is directly proportional to the deviation between the measured value and the set point (desired value). Proportional control alone is not normally used in process control, because a steady state error must always exist for any control effort to be exerted. Proportional control on its own reacts immediately to any deviation but it is insensitive to the rate of change of deviation. homepage.mac.com /sami_ashhab/courses/control/supplementary/lab/pid_level/pid_level.htm   (1269 words)

 Datatran Technical   (Site not responding. Last check: 2007-11-05) The output from a well-designed servovalve is directly proportional to the spool position and the spool position, in turn is directly proportional to the current flow through the coil. The amount of current flowing in the valve coil is directly proportional to the voltage drop across the sense resistor and within limits is not affected by the impedance of the coil. Proportional control alone adjusts it's output to be proportional to the error signal or the difference between the setpoint and the current value of the process variable. www.datatranlabs.com /tech_body.html   (8222 words)

 EET 112   (Site not responding. Last check: 2007-11-05) Induced voltage is directly proportional to the relative motion between a conductor and a magnetic field. Directly proportional to the number of turns in the coil, and inversely proportional to the current through the coil. Directly proportional to the number of turns in the coil, and directly proportional to the current through the coil. www.octech.org /faculty/LinkJ/eet112quiz1.htm   (647 words)

 Untitled Document The extension E of a spring is directly proportional to the force F pulling the spring. The variables m and n are related in such a way that n is directly proportional to the cube of m. A football kicked into the air to height h is directly proportional to square of the speed v at which it was kicked. www.easymaths.com /prob_proportion.htm   (446 words)

 [No title]   (Site not responding. Last check: 2007-11-05) The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object. In this entire discussion, the emphasis has been on the "net force." The acceleration is directly proportional to the "net force;" the "net force" equals mass times acceleration; the acceleration in the same direction as the "net force;" an acceleration is produced by a "net force." The NET FORCE. The law states that unbalanced forces cause objects to accelerate with an acceleration which is directly proportional to the net force and inversely proportional to the mass. atomic2005.persianblog.com   (4961 words)

 Momentum Effects on Aerodynamic Forces From Newton's second law of motion, the aerodynamic force F on the body is directly related to the change in momentum of the fluid with time t. The aerodynamic force is directly proportional to the dynamic pressure of the flow. The velocity used in the aerodynamic equation is the relative velocity between an object and the flow. www.lerc.nasa.gov /WWW/K-12/airplane/momntm.html   (552 words)

 [No title]   (Site not responding. Last check: 2007-11-05) the acceleration of a system is directly proportional to the inverse net force acting on it and proportional to the its total mass. the acceleration of a system is directly proportional to the inversely force acting on it and inversely proportional to the its total mass. To check to see when a total mass on a system is kept constant the acceleration of the system will be directly proportional to the net force acting on it, hold m1+m2 constant then plot the net force versus acceleration. www.csupomona.edu /~amorris/website/Physics/PHY131L_E6_PreLab.doc   (282 words)

 Direct Proportion Two quantities, A and B, are in direct proportion if by whatever factor A changes, B changes by the same factor. If two quantities, A and B, are directly proportional, then there is a proportionality constant, k, such that k times B will equal A. If A=kB, then a graph of A vs. B will yield a straight line through the origin with k as the slope: states that the acceleration of an object is in direct proportion to the force on the object. id.mind.net /~zona/mstm/physics/mechanics/forces/directProportion/directProportion.html   (607 words)

 Newton's Law of Universal Gravitation So for Newton, the force of gravity acting between the earth and any other object is directly proportional to the mass of the earth, directly proportional to the mass of the object, and inversely proportional to the square of the distance which separates the centers of the earth and the object. This force of gravitational attraction is directly dependent upon the masses of both objects and inversely proportional to the square of the distance which separates their centers. All objects attract each other with a force which is directly proportional to the product of their masses and inversely proportional to their distance of separation. www.glenbrook.k12.il.us /gbssci/phys/Class/circles/u6l3c.html   (1712 words)

 Information on Directly proportional [1913 Webster] Directly proportional (Math.), proportional in the order of the terms; increasing or decreasing together, and with a constant ratio; -- opposed to inversely proportional. Directly denotes, without any delay or diversion of attention; immediately implies, without any interposition of other occupation; instantly implies, without any intervention of time. Hence, "I will do it directly," means, "I will go straightway about it." "I will do it immediately," means, "I will do it as the very next thing." "I will do it instantly," allows not a particle of delay. www.wkonline.com /d/Directly_proportional.html   (293 words)

 BBC - GCSE Bitesize - Maths The extension e of a spring is directly proportional to the weight w hung on it. If a is directly proportional to r², given that a = 1 when r = 2, find the value of a when r = 8. If y is inversely proportional to the square of x, write down an equation connecting x and y given that x = 2 when y = 3.5. www.bbc.co.uk /apps/ifl/schools/gcsebitesize/maths/quizengine?quiz=proportion&templateStyle=maths   (246 words)

 [No title] The LRI does measure a differential pressure that is directly proportional to angle-of-attack, but it is also directly proportional to dynamic pressure (q in engineering terms). Although this mathematical expression has not been clearly documented, and is probably not exactly correct, we can conclude that DP is directly proportional to q and also directly proportional to angle-of-attack. By measuring an aerodynamic quantity proportional to both q and angle-of-attack, we have a better measure of total lift than an angle-of-attack meter could ever provide. www.liftreserve.com /Aero1.html   (879 words)

 CONFORMATION LECTURE   (Site not responding. Last check: 2007-11-05) The stability of a conformer is directly proportional to its energy. The stability of a conformer is directly proportional to its steric crowding. The stability of a conformer is inversly proportional to its steric crowding. www.cat.cc.md.us /~cminnier/211CON~1.HTM   (305 words)

 [No title] Ex 1: The area of a circle varies directly as the square of the radius. h is directly proportional to z, and h = 210 when z = 200. The cost, C of a house in Wedgewood Estates is directly proportional to the size of the house, s. www.selu.edu /Academics/Faculty/apearson/2-6DirectVariation.doc   (224 words)

 Make the Electoral College directly proportional to each state's population - Reviews on RateItAll   (Site not responding. Last check: 2007-11-05) So, ladies and gents, the electoral college is proportional (with the exeption of the 2 senators, but that cancels out) to each state's population. If we did proportional college votes it would, closely mirror the popular vote and it would potentially lead to situations where no clear majority holder existed; this would then be thrown to the House. Some say that the vote should go down to the individual results of the house districts, but that wouldn't truly be proportional because those seats are many states gerrymandered to elect either a Republican or Democrat. www.rateitall.com /i-71671-make-the-electoral-college-directly-proportional-to-each-states-population.aspx   (1411 words)

 GCSE.com: physics coursework analysing direct proportion Things are often found to behave in a so-called directly proportional relationship in physics. If this produces closely similar results, you can be certain your variables are directly proportional to each other. You can use this to say whether or not you have results that are directly proportional. www.gcse.com /physics_coursework_analysing_direct_proportion.htm   (403 words)

 magnetic force-FORCE ON A CHARGE MOVING IN UNIFORM MAGNETIC FIELD Magnetic force is directly proportional to the magnitude of charge. Magnetic force is directly proportional to the velocity of the charged particle. Magnetic force is directly proportional to the intensity of magnetic field or magnetic flux density. www.citycollegiate.com /magnetism_01.htm   (130 words)

 Eureka by Edgar Allan Poe Therefore the number of atoms in any stratum is directly proportional with the square of that stratum's distance from the centre. But the number of atoms in any stratum is the measure of the force which emitted that stratum- that is to say, is directly proportional with the force. Therefore the force which irradiated any stratum is directly proportional with the square of that stratum's distance from the centre:- or, generally, www.4literature.net /Edgar_Allan_Poe/Eureka/12.html   (642 words)

 Plasma levels of chromogranin A are directly proportional to tumour burden in neuroblastoma -- Wassberg et al. 151 (2): ... Plasma levels of chromogranin A are directly proportional to tumour burden in neuroblastoma -- Wassberg et al. Plasma levels of chromogranin A are directly proportional to tumour burden in neuroblastoma A novel animal experimental model involving the human, poorly differentiated, and adrenergic neuroblastoma cell line SH-SY5Y xenotransplanted to subcutaneous tissue of 13 nude rats (WAG rnu/rnu) was used to investigate the usefulness of six proposed neuroblastoma markers. joe.endocrinology-journals.org /cgi/content/abstract/151/2/225   (236 words)

 Previous Questions State whether "y" is directly proportional to "x" and if so give the constant of proportionality? When y is directly proportional to x, the equation has the form of y = kx where k is a constant. No, y is not directly proportional to x. www.gomath.com /Questions/question.php?question=6071   (693 words)

 (b) The observed rate constant is inversely proportional to [H+], ie directly proportional to [OH-], and the complex ...   (Site not responding. Last check: 2007-11-05) (b) The observed rate constant is inversely proportional to [H+], ie directly proportional to [OH-], and the complex has water ligands which contain acidic hydrogen atoms, so it is possible that the mechanism may be DCB (b) The observed rate constant is inversely proportional to [H ], ie directly proportional to [OH ], and the complex has water ligands which contain acidic hydrogen atoms, so it is possible that the mechanism may be D sst-web.tees.ac.uk /external/u0000892/Web%20thing/Mech/7b.htm   (74 words)

 Laser Cutting, speed proportional control of laser power This can achieved using the AMC to pulse the laser directly proportional to distance covered, or to set laser power by a pwm or analog output directly proportional to speed. The AMC automatically generates laser control pulse signals directly proportional to the distanced traveled by the laser. The high machine productivity features of the AMC make it particularly suitable for laser applications, in particular the 'vector blending' and long 'look ahead' enables the machine speed to be maximized at all times. www.neecontrols.com /laser-cutter.html   (551 words)

 Proportionality: direct and indirect   (Site not responding. Last check: 2007-11-05) When two variables are directly proportional to each other, they are related by an equation such as the following: When a directly proportional relationship is graphed, the result is a linear graph with slope k and y-intercept at the origin. It now becomes clearer to see that in an inversely proportional relationship, as one of the variables increases, the other decreases. mathcentral.uregina.ca /qq/database/QQ.09.00/ellis1.html   (180 words)

 BBC - GCSE Bitesize - SOS Teacher Biology Cell Activity Is Osmosis directly proportional??? If you put a potato in salt water, and the water has a higher concentration of salt than the concentration of the liquid inside the cells of the potato, then water will move out of the potato cells and into the salt solution. If you find that there is a relationship that is proportional between the saline solution and the weight of the potato, then there will of course be a similar relationship between the weight of the potato and the concentration of the salt solution. I assume that you have the data regarding the weight of the potato pieces before and after immersion in the solution, as it seems from your question that you do have this experimental data. www.bbc.co.uk /schools/gcsebitesize/sosteacher/biology/34037.shtml   (584 words)

 The rate constant of photoinhibition, measured in lincomycin-treated leaves, is directly proportional to light ... The rate constant of photoinhibition, measured in lincomycin-treated leaves, is directly proportional to light intensity -- Tyystjärvi and Aro 93 (5): 2213 -- Proceedings of the National Academy of Sciences The rate constant of photoinhibition, measured in lincomycin-treated leaves, is directly proportional to light intensity proportional to photon flux density at all light intensities studied. www.pnas.org /cgi/content/abstract/93/5/2213   (689 words)

 Class Notes Tuesday August 22, 2000 Math 121 Section 1   (Site not responding. Last check: 2007-11-05) A quantity Q is directly proportional to a quantity t if Q = k t where k is called the constant of proportionality. Is z directly proportional to P? If so give the constant of proportionality. so area of a circle is directly proportional to the radius squared. www.mtsu.edu /~dkimmins/121ClassNotesTuesdayAugust22.htm   (218 words)

 Fractional Intestinal Absorption of Magnesium Is Directly Proportional to Dietary Magnesium Intake in Rats -- Coudray ...   (Site not responding. Last check: 2007-11-05) Fractional Intestinal Absorption of Magnesium Is Directly Proportional to Dietary Magnesium Intake in Rats -- Coudray et al. Fractional Intestinal Absorption of Magnesium Is Directly Proportional to Dietary Magnesium Intake in Rats The amounts of Mg absorbed were directly proportional to the www.nutrition.org /cgi/content/full/132/7/2043   (3586 words)

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