What is Relative: Definition and 1000 Discussions

In music, relative keys are the major and minor scales that have the same key signatures (enharmonically equivalent), meaning that they share all the same notes but are arranged in a different order of whole steps and half steps. A pair of major and minor scales sharing the same key signature are said to be in a relative relationship. The relative minor of a particular major key, or the relative major of a minor key, is the key which has the same key signature but a different tonic. (This is as opposed to parallel minor or major, which shares the same tonic.)
For example, G major and E minor both have a single sharp in their key signature at F♯; therefore, E minor is the relative minor of G major, and conversely G major is the relative major of E minor. The tonic of the relative minor is the sixth scale degree of the major scale, while the tonic of the relative major is the third degree of the minor scale. The minor key starts three semitones below its relative major; for example, A minor is three semitones below its relative, C major.


The relative relationship may be visualized through the circle of fifths.

Relative keys are a type of closely related keys, the keys between which most modulations occur, because they differ by no more than one accidental. Relative keys are the most closely related, as they share exactly the same notes.

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  1. Benjamin_harsh

    Calculating Relative Speed & Time to Meet: I Can't Find the Distance

    I able to calculate this 2 things: relative speed of A and B = 3 + 1; 4m/sec Time for meeting for first time in opposite direction = 100/(3+1); 25 sec I can't able to find distance in Meeting for first time for opposite direction.
  2. L

    Is rotation a relative property?

    I was recently trying to explain to a grandchild the relative nature of velocity (the different paths of a coin dropped by a passenger on a train, as seen by the passenger on one hand and a trackside observer on the other), and the invalidity of the concept of absolute velocity. For some reason...
  3. matternat968

    B Relative Nature of Speed: Einstein and Orbits

    At the risk of sounding stupid, this question has always perplexed me. Einstein theorized that mass can not travel faster than the speed of light. I don't really understand it, I assume it has something to do with mass just being energy. Anyway imagine two objects in orbit of something with...
  4. jk22

    I Time Dilation: Relative to Medium or Vacuum?

    If a medium with speed of light ##c_1## is considered, shall the Lorentz transformation be considered relative to it or to speed of light in the vacuum ? I don't know if we could send particles like muons through water for example, to check this with their life time.
  5. K

    What is the normal force in A and B?

    A welded square frame consisting of four equal rods each with mass m and length 2l can move in the vertical plane by means of two small wheels in A and B that move without friction along a horizontal and vertical track, respectively. The disc is released from rest in a position where the sides...
  6. bland

    B Relative Dead Stop in Deep Space

    So there's two spaceships in deep space. at rest with respect to each other. Then one of them shoots off at some huge speed and everyone feels it. Then they shut the engines off suddenly. No one is going to suddenly lurch forward, they will at the instant the engines are shut off effectively be...
  7. Like Tony Stark

    Measuring position, velocity and acceleration in relative motion

    Well, ##r(t)## in ##A## is just a vector ##(0;y)## because is tangent to the trajectory. Then, from the perspective of ##B## the particle moves in an uniform circular motion. Is this right? The velocity from ##B## must be ##\omega##, right? And what about acceleration?
  8. Like Tony Stark

    Pulley system with relative motion

    Well, first I tried to understand the relation between the velocities and accelerations of both bodies and I got that the velocity of ##B## is half the velocity of ##A##. This is because a change in length of the cord "that touches ##A##" must be equal to the change in length of the two cords...
  9. Like Tony Stark

    Spaceship approaching Mars and relative motion

    As the problem asks for the spaceship's perspective, I know that I should take ##\vec v_S=0## and ##\vec v_M=24.1-19.3## because the motion is relative to the spaceship. Then, the relative velocity of Mars and ##SM## should have the same direction. If they have the same direction, that angle...
  10. Like Tony Stark

    Relative rotational motion on a disc

    The first doubt that comes to my mind is "I have to determine the acceleration with respect to what?", because the problem doesn't tell. Then, I have some problems when having to plug the data in the formula of acceleration. ##\vec a_B=0## because the origin isn't accelerated, ##\vec{\dot...
  11. K

    Relative Permitivity of Black Paint | Hi Thank You!

    Hi i want to know what is the relative permitivity value of black paint. Thank you.
  12. Santilopez10

    Relative motion between cars with different types of movements

    I think my approach is quite wrong, still I gave it a shot: First I know that ##v_A=13.3 m/s=r\omega=60\omega \rightarrow \omega=0.2 \frac{rad}{s}## Then $$\vec a_A=-r\omega^2 e_r=-2.4 e_r$$ But ##e_r=\cos{\theta}i+\sin{\theta}j## and substituing the latter in the acceleration equation I have...
  13. GuillemVS

    B But in reality, time isn't relative at all, right?

    I don't know how to make that question better, to not seem as if I'm asking why is time relative (that's not what I'm looking, I think). When we say that time is relative, we look at how many time takes light to go from one point to another, in order to be seen from another perspective. So...
  14. jisbon

    Relative velocity of a ball thrown inside a moving truck

    Hi all, Not sure on how to start this question in the first place, but from what I gathered from the data given I managed to derive this from the question: ##\theta = 53.13\deg## Let inside truck be t, final position be f, and ground be g ##D_{ft} = L## ##D_{fg} = xL## Also, for velocity...
  15. E

    Relative velocity of two gravitationally attracting spheres

    There have been some other threads on similar problems but none address one specific point I'm confused about. The change in GPE of a body is the negative of the work done on that body by a gravitational field between two points; by this logic, since the same (but opposite) gravitational forces...
  16. adosar

    B Time Dilation & Relative Motion: Who Measures Proper Time?

    Consider the example of flashing light in spaceship. The observer in the spaceshipe and the observer in the Earth measure different times. Both observers could argue that the clock of the other tick slower(motion is relative). But is anyone right ? I mean the one will measure proper time...
  17. E

    B Confusion over relative velocities and reference frames

    I will refer to the example given in 'On the electrodynamics of moving bodies' concerning a rod moving in a coordinate system, in which a beam of light is sent from one end of the rod to the other and is then reflected back. Usually when calculating relative velocities, we may simply consider...
  18. GuillemVS

    How to get the absolute position of a relative object?

    I don't know if this question suits this forum, I post this here actually because I saw (if not my memory is failing) that here it is also possible to solve math problems. So, back on track: I like to discover things from myself, so I searched for the Euler's formula, willing to find the...
  19. Manasan3010

    Impossible Relative Velocity Values

    The answers were 1) 150 km/h 2) 200 km/h 3 )500 km/h 4) 700 km/h 5) 800 km/h (Chosen Solution) I know that values 700km/h ,100km/h ,-100km/h are possible scenarios but in what ways are 150km/h ,200km/h and 500km/h possible ?
  20. Arman777

    I How Does Time Dilation Affect Space Travel Duration?

    Let us suppose a spaceship moving from Earth to another star that is 10ly away with a speed of 0.99c. Calculate the of years spaceship takes to reach its destination (a) in the rest frame of an observer on Earth and (b) as perceived by a passenger on board the ship For (a) I find that ##t_0 =...
  21. S

    I Two Observers Moving Opposite Dir Rel to Each Other

    Hello guys. I have a question for one of postulates of relativity. Consider there are three observers (called A, B, and C) in x-direction only. A is at rest. B is moving to the left relative to A with velocity 0.7c. C is to the right relative to A with velocity 0.7c. Then when A sees B or C...
  22. pobro44

    Two body problem, velocities of two bodies, relative velocity given

    When only force acting on body is a central force, angular momentum is constant and given by: L = mr^2 * w where r is distance from origin, and w is angular velocity. Angular momentum can also be written as following: L = r x mv = rmv * sin(theta) where v is tangential velocity, which is...
  23. S

    I How Do Rockets Traveling at High Speeds Observe Each Other's Velocity?

    This came to me in a blur of confusion whilst reading another thread about a giant wheel spinning, and it's made me confused. I'm hoping that this is something which someone can explain to me in a way I'll understand. Summary of my knowledge: 1: the speed of light is the same in all directions...
  24. mPlummers

    Relative error and measurement precision

    NOTE: this is a programming exercise (Python). I started adding to ##x_{true}## an error related to a (for example) 10% relative error, obtaining ##x_{measurement}##. Then i computed ##y_{measurement}##. To find the precision, i calculated ##(y_{true}-y_{measurement})/y_{measurement}##. If it is...
  25. J

    Unable to clearly understand relative velocity

    Unable to understand why this is the case? Also, if it were in two dimensions then I am guessing the same would apply, only the 'x-co-ordinates' and 'y-coordinates' would add up separately? Lastly, does the same hold for acceleration. I am aware that this is a trivial question, many books...
  26. Flying_Dutchman

    I CExploring the Coastline Paradox: Are Dimensions Relative to the Observer?

    A point is taken as an example of a 1D, a plane 2D and a sphere is 3D. If a point is viewed say at 1000x enlarged the point appears as a plane similarly if we a view a large sphere from very far it does appear as a dot. So can we say that dimension are relative to the observer ? Had our sights...
  27. E

    Comparing RBE to relative penetrating power?

    Relative biological effectiveness is a factor that radiation dose is multiplied by to account for differences in biological damage by varying types of radiation. RBE is higher for alpha particles than any other, yet the relative penetrating power of alpha radiation is the smallest of the four...
  28. gibberingmouther

    Relative Motion of Charges Question

    This problem seems pretty simple but I don't understand how the correct answer is 500,000 smaller than what I calculated. You have an electric field that has a magnitude of 10^6 V/m in the positive z direction. I assumed (though it was not stated) that the cause of this field was a sheet of...
  29. D

    Angular momentum of a system relative to a moving reference frame.

    I don't have too much of a clue of how to begin the problem. I first wrote the angular moementum of the system of particles: →M=∑mi(→ri×→vi)M→=∑mi(r→i×v→i). Then I know that the angular momentum from of the moving reference frame would have the velocity as the sum of the velocity of the frame...
  30. T

    Relative Velocity of Swimmer: How to Calculate Total Time for Different Paths?

    So I was just wondering if someone could check my method for (b) as sometimes I can have a tendency of getting the relative components wrong ect. Diagram 1 (a) Time for PY: ##T=L/c## Time for YP: ##T=L/c## Total Time:##2L/c## (b) Velocity for PY: ##c-v##...
  31. B

    Relative velocity between a Bus and a Car

    for part 1: t= d/s = 9000/13 = 692.31s for part 2: What i am unsure about is wether or not this is after the initial observation or exactly what they are asking honestly. so i found the relative velocity of the bus to the car and vice vera and came up with: t=d/s = 9000/4 = 2250s however i don't...
  32. T

    Relative Density Word Problem

    So I am a bit stuck on this question as my result using the above equations dose not give an numerical value which I assume from the question is needed. So here my method for solving My first thought was that if on the planet the person can throw a rock 10 time further then that it implies in...
  33. R

    Relative velocity between lift and screw

    v=16m/s+4*.659s=18.636m/s (for lift) v0=16m/s-9.81*.659s=9.53m/s my question is that why 16m/s is considered for screw velocity ? it is given for lift .what does it mean 9.53m/s? If you drop something , it gets acceleration and I calculate it 6.45m for screw while falling and why should I...
  34. N

    How do I compare indoor and outdoor relative humidity levels?

    If my inside relative humidity level is 50% at 73 F, and my outside relative humidity level is 97% at 36 F, how can I tell if I open my door, whether I will lose inside humidity into the atmosphere? The real life scenario is that my wife complained that the humidity was too low in the house...
  35. K

    How to measure the Sun's acceleration relative to the galaxy?

    How would the acceleration of our sun relative to our galaxy be determined? A spaceship in orbit around our sun, with engines turned off, is in free fall. Accelerometers will read zero. Turning the engines on, the accelerometers will read the acceleration due to the thrust from the engines...
  36. Shakattack12

    Relative Refractory Period of Action Potentials

    Hello, Quick question on the relative refractory period in neurons. I understand it is caused by the slow closing of voltage gated K+ channels, which leads to hyperpolarisation. This means a larger than normal stimulus is required to bring the membrane to threshold. However, after reading my...
  37. M

    Dynamics: Relative Acceleration

    Homework Statement The problem is in the image attached below 2. Homework Equations In the working below (although I think I have misunderstood a concept) The Attempt at a Solution My attempt is in the attached image. I tried to leave the numbers out until the end. I have not written...
  38. EEristavi

    Motion in 2 Dimensions & Relative velocity

    Homework Statement The water in a river flows uniformly at a constant speed of 2.50 m/s between parallel banks 80.0 m apart. You are to deliver a package across the river, but you can swim only at 1.50 m/s. (c) If you choose to minimize the distance downstream that the river carries you, in...
  39. M

    A Regression analysis: logarithm or relative change?

    Hi. I am currently studying the market for equity options and the use of these to predict stock return around company earnings announcements. The dependent variable in my regression analyses have been the relative change in stock price or log-return from the day before the announcement to...
  40. M

    Rigid Body Rotation relative velocity question

    This is a question about the concepts behind rigid body rotation when we use relative velocity. In general, let us say that we have a rigid body and on it are two points, A and B, which are moving with velocities vA and vB respectively. These velocities are in random directions. The theory...
  41. nineteen

    Chemistry Finding the Chemical Formula and Relative Molecular Mass

    My chemistry teacher gave me this problem. I tried and tried, but I couldn't figure it out and the deadline is tomorrow. Please help me out here friends. 1. This is the problem : In a compound which is made of element Y, weight percentage of Y is 72% and N( Nitrogen) is 28%. Also, 3 Y atoms...
  42. G

    Request about experiments on the linear-motion Faraday paradox

    The Faraday paradox is a very curious example in the topic of relative motion. An experiment demonstrating the curious results is shown in the video below: This has made me curious about the linear version of the Faraday paradox. A conductor placed atop a magnet, both at rest in one scenario...
  43. S

    Relative Wind Problem (Modern Engineering Mathematics, 5th)

    Homework Statement A cyclist traveling east at 8 km/hr finds that the wind appears to blow directly from the north. On doubling his speed it appears to blow from the north-east.. Find the actual velocity of the wind.[/B]Homework Equations Wind(relative) = Wind(Actual) - Velocity(cyclist)...
  44. Jim Lundquist

    I Relative Amount of Hydrogen in the Universe

    Did hydrogen reach some maximum level in the early universe before fusion began creation of helium and thus decreasing the amount of hydrogen, or do fission reactions maintain some kind of balance? If the universe is constantly expanding, the density of remaining hydrogen would seem to decrease...
  45. M

    Relative Velocities: Speed of C in A's Frame

    Homework Statement Three trains A, B, and C with equal proper lengths L are moving on parallel tracks. In the frame of A, B has length 4L/5. In the frame of A, what is the speed of C, if the lengths of A and B are equal in the frame of C Homework Equations u'=[u-v]/[(1-uv)] c=1 The Attempt...
  46. B

    Calculate rest mass given relative speed and kinetic energy?

    The answer is 3.079*10^-26 kg I tried doing E=mc^2 20*10^9*1.602*10^-19=m*(3*10^8)^2 m=3.56*10^-26 kg However when I do E=γmc^2 I get the correct answer. Is the question wrong, because isn't it 20 GeV of kinetic energy, not total energy?
  47. jishnu

    B Impression of relative velocities

    Hi everyone, This is just a random thought that popped up in my mind while I was traveling in train to my college When we are inside a moving object and looking outside those thing that are near appears to move back(or move in opposite direction to that of our motion) with a same speed as...
  48. F

    Standing waves on a string experiment -- Relative amplitude of harmonics

    Hello forum, I am wondering why the higher order (higher harmonics) standing waves developed on a string under tension generated by an oscillating mechanical vibrator (set at the same amplitude but with variable frequency) have lower amplitude when compared to the lower harmonics (the...
  49. X

    I Understanding the Relative Velocity Paradox

    Hi! I'm an utter novice at physics, so please bear with me if I ask a foolish question. I just learned that velocities don't purely add: 2m/s + 2m/s does not equal 4m/s, but something like 3.9999999...9 m/s, and so on. Something to do with the upper limit of c. Logic makes me assume that this...
  50. D

    CO2 [ppm] exposure relative to room volume [m^3] and air ventilation

    Hi All, I am trying to find out how much CO2 (ppm) would be released into a ventilated room (m3) from a faulty pressurized gas cylinder to calculate risk associated. Would anyone be able to help me with a formula? I was trying to work with V=nRT/P but wasn't sure how do I translate the outcome...
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