What is Frames: Definition and 630 Discussions

Dropped Frames is a multi-album project by American musician Mike Shinoda, currently consisting of three volumes. Dropped Frames, Vol. 1 was released on July 10, 2020, with subsequent volumes following on July 31 and September 18 of the same year. The project was composed interactively with fans on Shinoda's Twitch channel. All three albums were distributed via Kenji Kobayashi Productions, Shinoda's own company capitally related to Machine Shop co. With the exception of the opening track of volume 1, "Open Door", tracks on Dropped Frames are primarily instrumental.

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  1. J

    Lorentz transformations ( synchronising reference frames?)

    Lorentz transformations ("synchronising" reference frames?) Homework Statement A particle moves from (x,y,z,t) = (0 m,0 m,0 m,0 s) to (1 m,1 m,0 m,10 ns). i. What is the speed of the particle in this reference frame? ii. What is the speed of the particle in a reference frame moving...
  2. A

    Is symetry across inertial frames purely theoretical?

    Hi. If the twin paradox, etc, is not really a paradox because one twin experiences acceleration, then is the idea of recipricol time dilation etc due to symetry across inertial frames purely theoretical? What I mean is that could we ever find two inertial frames moving relatively to each other...
  3. D

    Bullet vs Photon: speed of light, momentum and reference frames

    X________________ moving | observer | | ---> v (moving speed train) photon | ^________________| X________________ ^ moving | ^ ^ observer | d1 ^ ^...
  4. Grimble

    Time scales in Inertial Frames of Reference

    Hello, I am trying to understand the relationships of the time scales that obtain within different Inertial Frame of Reference. Not when viewing one frame from another, I am quite happy with the Lorentz factor for that. No it is how the local time scale, that measured by a stationary, local...
  5. D

    Velocity of rain in different reference frames

    I'm having some trouble with the below vector question. I've got an answer although I'm not sure if it is correct or not. Homework Statement A car travels due east with a speed of 40 kph. Rain drops are falling at a constant speed vertically with respect to Earth. The traces of the rain...
  6. M

    Estimating Photon # in 2 Frames: Lorentz Transformation

    Suppose there is some EM wave in the vacuum with frequency and field strength \omega,E In the frame of someone moving along with the light, the frequency and field become: \omega^{\prime} = \alpha \omega\,, E^{\prime} = \alpha E\,, \alpha = \sqrt{\frac{1-\beta}{1+\beta}} Suppose both observers...
  7. e2m2a

    Orthogonal angle with respect to all inertial frames?

    Here is a thought experiment that I cannot resolve. Maybe someone smarter than I can do this. Suppose we have a long, thin rod rotating in the counter clockwise direction. The rod rotates around an axis which is connected to one end of the rod. The axis is attached to a second object which...
  8. blainiac

    Help finding time between two frames for collision detection

    Hey everyone! I programmed a verlet physics engine that works great. I got to the collision detection and response and it's been frustrating to say the least. I've tried tons of different ways, but no cigar. The collisions themselves are between points and lines between points. These...
  9. K

    Bernoulli's principle / ref frames

    Situation: a car moving quickly down the road with a window open. Car reference frame: the air outside is moving, thus has lower pressure, thus the air inside the car will be sucked out the window. World reference frame: the air in the car is moving, thus has lower pressure, thus the...
  10. H

    Einstein's Theory: All Frames Equally Important for Time

    Einstein said that all frames are equally important. Now, assume that I (or body A) was moving at a velocity of V. If body B was considered to be stationary and I was traveling away from it at a high speed then my time would slow down. This I understand. But... If body A was the inertial...
  11. M

    STRACT: Inertial Frames in Special and General Relativity

    How are inertial frames defined in Special and General Relativity? In Newtonian physics, an inertial frame is usually defined as one in which N2 holds. Clearly this cannot be the same definition as for SR. In GR an inertial frame is one in which SR holds (I think). However, there is now a...
  12. G

    Inertial Frames: Is 'Absolute Rest' Possible?

    Hello... learning to post and into the appropriate forums. Also, can you delete previous post and how? Quick question: Since time as we know it does not or can not 'stop'... Is there such a thing as an intertial frame at 'absolute rest'? Thank you for any and all responses. Bye G
  13. I

    Rotating Frames: charges in a magnetic field

    I've got a problem understanding a line of proof in my lecture notes. Given that you have a charge of +Q and mass m orbiting a fixed particle of charge -Q' in the presence of a magnetic field B. The particle is moving slowly enough for relativistic effects to be ignored. Given that...
  14. G

    Equilibrium in Multiple Inertial Frames

    Two massive lead balls are sprayed with a thin veneer of positive charge. They are isolated and at rest in inertial frame K. The positive charge is such that the electrostatic force of repulsion exactly cancels the gravitational force of attraction. Viewed from frame K’, the Lorentz force on...
  15. U

    Can objects move faster than the speed of light in certain reference frames?

    Here's a question that's bothered me for a while. Suppose you are a person (P) at point A. You travel between point A and B at some fraction of c (speed of light). And so relativity kicks in. Now, that's the standard relativity model and we talk about P with regard to A and B. Now, what...
  16. B

    Converting partial derivatives between coordinate frames

    Homework Statement Given Cartesian coordinates x, y, and polar coordinates r, phi, such that r=\sqrt{x^2+y^2}, \phi = atan(x/y) or x=r sin(\phi), y=r cos(\phi) (yes, phi is defined differently then you're used to) I need to find \frac{d\phi}{dr} in terms of \frac{dy}{dx} Homework...
  17. P

    Kinetic Energy of Objects in System, in different frames of reference.

    Hey! So, as I understand, kinetic energy of a moving object is proportional to its velocity squared. So I'm wondering where these inconsistencies come from, and how they are resolved: So, say two objects of mass M are travelling, with reference to a stationary observer, one in the left...
  18. Z

    How does the principle of Reference Frames work?

    How does the principle of "Reference Frames" work? What would be an appropriate answer for that statement? I can't think of anything fitting, also I'm not too educated in that subject. Any help is greatly appreciated. :)
  19. Z

    Frames of Reference on Top of a Moving Train

    When an object is thrown by someone standing on top of a moving train, which variations of "frames of reference" would apply? (i.e. inertial, non-inertial, etc.) How would this principle work? (The object would go the same relative distance as it would if thrown from a person standing on...
  20. T

    Relativistic scattering Lab and CM frames

    Hi! I have the following problem: Example: collision of 2 electrons For non-relativistic scattering it is easy to show that the speed of the CM frame with respect to the lab frame is equal to the speed of the electrons in the CM frame, expoloiting the fact that in the lab frame, one of the...
  21. K

    Time dilation and non inertial reference frames.

    Homework Statement A clock chimes every hour, on the hour in it's rest frame, is it possible for an observer to measure the time between chimes less than an hour? Homework Equations t = \gamma t0 The Attempt at a Solution I understand that if an observer traveling in the frame S'...
  22. V

    Rotating frames (non-homework)

    Homework Statement This is an example problem from the book. However, I have absolutely no clue how they solved it. I cannot follow their logic. If someone can just solve it and explain it for me lucidly step by step, I would really appreciate it. Here it is: "A bicycle travels with...
  23. E

    Relative Motion: Framing Object Velocity

    So, for example, 2 objects are moving towards each other. There is a frame where 2 object move with (for the sake of simplicity thy both move with the same velocity) the velocity V Then there is a frame where one of the object stand still, but the other moves towards it with the velocity 2V...
  24. M

    Does c-invariance in SR postulate need inertial frames ?

    2 textbooks I have give postulate 2 of SR as: "The speed of light in vacuum is constant in all inertial reference frames". But "Classical Dynamics" by Jerry B. Marion has: "The velocity of light in free space is a universal constant independent of any relative motion of the source and...
  25. LarryS

    Can the SR Concept of Reference Frames be Applied to Quantum Mechanics?

    SR "Reference Frames" in QM ? The SR concept of “Reference Frame” cannot be transferred to the micro-world of QM because, due to the HUP, space and time are blurry in that world. Comments? (Thanks in advance).
  26. B

    Rotating frames of Motion in Vector Notation

    Afternoon, I'm studying Engineering Dynamics (4th Year Undergraduate) and I was wondering if anyone can point me to a resource with regards to rotating reference frames and vector notation? The notes I've been given aren't particularly helpful. Much appreciated.
  27. B

    Frames of reference problem help(grade 12)

    Homework Statement A boat goes at 7.78 m/s [37 degrees west of south] in a current of 2.41 m/s [5 degrees north of west]. Find the velocity compared to the bottom. Homework Equations I think we use this: Vf2 = Vi2 + 2a x delta d The Attempt at a Solution I drew a diagram but...
  28. W

    Coriolis and different refererence frames

    Hello, I am stuck on the coriolis force. If an object is dropped how do I get the eastward deflection when looking from an inertial frame? I know how from the rotating frame but for some reason I am stuck, i.e. what terms to use. Also, if I throw a ball straight up from Earth what is the...
  29. S

    Relative acceleration & reference frames

    Homework Statement 1. You are passing another car on a highway and determine that, relative to you, the car you pass has an acceleration toward the west. However, the driver of the other car is maintaining a constant speed and direction relative to the road. Which of the following statements...
  30. B

    The 29.97 frames per NTSC standard

    I have read before that when color television was developed the frame rate was changed from 30 frames per second to 29.97 frames per second to avoid some kind of problem with the circuitry, but I have never seen an explanation of just what this technical problem was. My somewhat educated guess...
  31. M

    Understanding Inertial Frames: How to Determine if You're in One

    Is there really such a thing as an inertial frame? How would we know for sure if we were in one? Looking at space, things are moving and accelerating all over the place, it would seem impossible to tell whether a frame is really inertial or not. Imagine you are in space and everything around...
  32. S

    Line charge in different frames.

    Here is an interesting question (units are Gaussian): An infinitely long strgiht wire of negligible corss-sectional area is at rest and has a uniform lineare charge density q_0 in the inertial fram K'. The frame K' (and the wire) move with a velocity v parallel to the direction of the wire...
  33. A

    Is c invariant in Accelerating frames?

    Simple question. I would like to know if there is a definitive answer , consensus in the field, on the question of the measurement of light in an accelerating system. Whether one way measurements from the front to the back and vice versa would result in (c +v) = (c-v) = c as usual...
  34. Z

    Understanding Magnetism in Different Reference Frames

    What if i was traveling in a car with an e- with me. W.r.t to a positive charge at rest , it would seem accelerating to me i.e. it would have a magnetic field but acc. to a person on the ground it would just have an electric field. If there were a car moving relative to me , the person would...
  35. K

    Gravitational Field & Reference Frames

    In Newtonian physics gravity is a force and in relativity it's curved spacetime if I understand it correctly. So my question is, does the gravitational field of an object look different to different observers? What I mean is, does one reference frame see the strength of the field to be greater...
  36. DuckAmuck

    How much energy is needed to create 3 protons and an antiproton from 2 protons?

    So, here is the situation: One starts with 2 protons, they collide and one ends up with 3 protons and an antiproton. How much energy will you need to do this? Upon inspection, it seems you will just need 2mc^{2} in kinetic energy to create 2 new proton-massed particles. This is wrong I...
  37. L

    String theory and reference frames HELP

    I am reading The Elegant Universe...and I have bumped to possibly the first part of the book that I can not understand. When an electron and a positron pop out of existence, they soon annihilate each other with a "bang"...emitting a photon. If fundamental substance of universe are...
  38. A

    Special Relativity and reference frames

    Here's a statement that I'm supposed to solve: (\Deltax')2 = (\Deltax)2 - c2(\Deltat)2 And the accompanying text: "Show that (the equation above) is the same for all reference frames in special relativity" I consider myself somewhat decent with your basic special relativity calculations...
  39. M

    Oscillating table and reference frames

    Homework Statement A horizontal table oscillates with a displacement A sin ωt , where A = (Ax , 0, Az ) is the amplitude vector and ω the angular frequency in an inertial frame of reference with the z axis vertically upwards, normal to the table. A block sitting on the table has mass m and...
  40. C

    Solving 4-Vectors and Wave Amplitudes in Different Frames

    Homework Statement I am aving a bit of trouble understanding how to show something is a 4 vector. For example K = (v/c, 1/lamdba, 0, 0 ) Show it is a 4-vector. I am not quite sure how to start this. Similarly I have the amplitude of a wave in frame S described as A=cos[2PI(vt-x/lambda)] and...
  41. V

    Understanding Frames of Reference in Relativity

    Im trying to understand frames of reference, I am very new to relativity so sorry if I am being silly! Suppose you have a 2 spacecraft one traveling relative to the sun, and the other traveling relative to the first spacecraft in a perpendicualar direction. i know the velocitys of...
  42. O

    How Do Lorentz Transformations Confirm a Rocket's Motion in Special Relativity?

    Homework Statement Show that the primed frame corresponds to a 'rocket' frame moving at speed v in the x direction relative to the unprimed frame. Variables: x, x', t, t', y, y', z, z' Homework Equations ct' = γct - βγx x' = γx - βγct y' = y z' = z The Attempt at a Solution...
  43. C

    What is the Relationship Between Energy and Time in Different Frames?

    something which seems so fundamental that i can't find anywhere that derives it is the following: E' = gamma * (E - p.v) where E is the energy in one frame, p the momentum, v the relative velocity of the other frame, and E' the energy in the other frame. i.e. energy transforms like...
  44. Spinnor

    Does the CMB allow special rest frames to be defined?

    Does the CMB allow special "almost" rest frames to be defined? In this sense, use a rocket to put yourself in a frame of reference such that in this frame observations of the CMB would average to zero (average over photon momentum) over your celestial sphere. In such a rest frame is the total...
  45. C

    Special relativity inertial reference frames.

    [b]1. Suppose the space time co-ordinates of two events in inertial frame S are as follows: Event 1: x1=x0, t1=x0/c y1=z1=0 Event 2: x2=2x0, t2= x0/2c y2=z2=0 Show that there exists an inertial frame s' in which these events occur at the same time (i.e t1'=t2') and find the value of time...
  46. C

    Spacetime we are able to distinguish between different inertial frames

    A professor told me that in our spacetime we are able to distinguish between different inertial frames because the cosmic microwave background looks different. If this is true then what spacetime do we live in? What would it look like mathematically. Would the det(g) not be negative?
  47. Q

    Special relativity - frames of reference

    Homework Statement We have two frames of reference: K (x,y,t) and K' (x',y',t') such that initially x=x'=y=y'=t=t'=0. Now let K' move with a velocity \vec{v} = v [\tfrac{1}{\sqrt{2}},\tfrac{1}{\sqrt{2}}] Write Lorentz transformations in such a case. Homework Equations The Attempt at...
  48. R

    Show momentum is conserved in two different frames (relativity)

    Homework Statement A 2000-kg car moving with a speed of 20 m/s collides with and sticks to a 1500-kg car at rest. Show that because momentum is conserved in the rest frame, momentum is also conserved in a reference frame moving with a speed of 10 m/s in the direction of the moving car...
  49. M

    Deriving acceleration in rotating reference frames

    Hi, everyone:) In my mechanics book a derivation is given for acceleration in rotating reference frames. However, there is one step I don't understand. First of all, it is derived that v=v'+\omega\times r' or \left( \frac{dr}{dt}\right) _{fixed}=\left( \frac{dr'}{dt}\right) _{rot}+\omega\times...
  50. J

    Frames of Reference: Exploring Motion & Inertial Frames

    I keep hearing how motion only exists relative to something else. But what if there is some object in space, and it is the only object in the universe. It has some kind of propulsion system, and it activates it, goes to a certain speed, then stops accelerating. Is that object really moving, or...
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