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. U

    Relative acceleration between intertial reference frames?

    Does special relativity hold between two inertial reference frames that are undergoing relative acceleration? For example, consider two spaceships traveling toward each other on parallel (but not collinear) trajectories. They would pass each other at some non-zero distance, and thus their...
  2. Dale

    Frames vs Coordinates: Mapping Points in R4 to Events in Manifold

    I am generally pretty sloppy in my terminology on this point and use "reference frame" almost synonymously with "coordinate system". Is this a correct distinction between them: A coordinate system is a mapping from points in R4 to events in the manifold A reference frame is an orthonormal...
  3. grav-universe

    How to make two frames purely Galilean

    It is possible to synchronize two inertial frames with a relative speed between them such that what they measure of each other is purely Galilean. That is, according to each of the frames, they will measure no time dilation of each other, so their clocks will tick at the same rate, no length...
  4. L

    SR, electromagnetic waves in moving reference frames.

    Homework Statement Not really a homework/coursework problem, I'm just trying to make sense of some class notes from our chapter on special relativity. I'm trying to find the expression for electromagnetic wave propagation in a reference frame S' that is moving at a constant velocity with...
  5. S

    Understanding Acceleration From Different Frames of Reference

    This is what my teacher told me, but I still don't really see how it works. Say a person is in a car traveling at constant velocity, and it crashes into a tree, from an inertial frame of reference (the road), the person in the car continues traveling at the constant velocity of the car until...
  6. W

    Cons. Angular Momentum & Reference Frames

    Hi! I'm currently a student taking a classical mechanics course. Finals are coming up, and I've come to realize that I seem to have a firm grasp of most of the material (energy, forces, etc...) but not momentum. I know this because I was flabbergasted by a problem on my last midterm that...
  7. Z

    Lorentz Transformations and Reference Frames Problem

    Homework Statement In the old West, a marshal riding on a train traveling 35.0 m/s sees a duel between two men standing on the Earth 55.0 m apart parallel to the train. The marshal's instruments indicate that in his reference frame the two men fire simultaneously. (a) Which of the two men, the...
  8. J

    How Do Rotating Reference Frames Affect Forces on a Merry-Go-Round?

    Looking down from a stationary tree branch, a merry-go-round spins in a counterclockwise direction with an angular velocity of 1 radian per second. a squirrel of mass 0.2 kg sits on the outer rim of the merry-go-round, at a radius of 2.0 meters. a) what is the magnitude and direction of the...
  9. J

    Inerital vs Non inertial reference frames: quick conceptual question

    Homework Statement I'm doing a problem in which an ant crawls in a circle on a spinning pottery wheel. Say I'm looking at the friction which holds the ant in place. It keeps the ant from slipping. Looking at it in the inertial frame of reference, I know that the centripetal force points...
  10. A

    Why is the speed of light same in all reference frames?

    kindly be descriptive
  11. A

    Events in different reference frames

    I am having trouble with measuring coordinate time in different inertial reference frames. For example: Say a car is driving around a circular track (at constant v) and passes a stationary observer. I'll call this event A. Then the car makes another lap and passes the observer again (Event...
  12. A

    Finding Reactions in a Pinned and Roller Supported Beam: A Step-by-Step Guide

    Homework Statement The beam ABC in attachment has a pinned support at A and Roller supports at B and C. P is an internal pin. I have to determine the reactions at A, B and C and at the pin P when the beam is loaded as shown in the attachment Homework Equations \SigmaV=O \SigmaH=0...
  13. 1

    Light's constant speed and frames of reference

    Been reading up on physics out of pure interest, just learning really. Mainly started special relativity and learning about the inertial frames of reference. I think I understand that, but here's what I don't get. If from one inertial frame of reference moving at a constant 100 MPH, I toss...
  14. J

    Rotating Frames of Reference question.

    Homework Statement You are standing on a slowly rotating merry-go-round, turning counterclockwise as viewed from above. You are holding a string from which is suspended a rubber stopper of mass 45g. You are 2.9m from the center of the merry-go-round. You take 4.1s to complete one revolution...
  15. J

    Different frames of reference and particle production? a contradiction maybe?

    Hi, Second time I'm writing this question, the first one seems to have been lost in cyberspace but sorry if it somehow comes back and appears twice. Anyway, you know how kinetic energy depends on velocity, so that the energy of a particle collision will be different for two frames of...
  16. B

    Frames can really travel faster than light?

    I've read about 'ergosphere' in wiki and surprised at the information presented that ergospheres around very fast spinning black holes can drag space time many times faster than light! Such that any object that falls into this spinning ergosphere, will also begin to 'accelerate' to match the...
  17. L

    Simple question about inertial frames of reference

    Hello, I know that this is going to sound stupid, so please forgive me, but could someone give me a brief and simple definition of what an inertial frame of reference is and what a non-inertial frame of reference is? Thanks, Louis
  18. M

    Is There a Type of Wood Strong Enough and Affordable for Building Car Frames?

    Can we built the small passenger car body using ANY WOOD which is STRONGER and CHEAPER? If so, name the wood.
  19. W

    Special relativity clocks observed from two frames

    Homework Statement Observers S and S' stand at the origins of their respective frames, which are moving relative to each other with a speed of .6c. Each has a standard clock, which, as usual, they set to zero when the two origins coincide. Observer S keeps the S' clock visually in sight...
  20. W

    Particle energy and momentum in different reference frames

    Homework Statement A particle is observed in a certain reference frame (i.e. observer A) has a total energy of 5GeV and a momentum of 3GeV/c. (a) What is the energy of the frame in which its momentum is equal to 4GeV/c. Homework Equations E'={\gamma}E-{\gamma}{\beta}(cp)...
  21. I

    Can SR handle acccelerating frames?

    This is the continuation of a discussion in https://www.physicsforums.com/showthread.php?t=431068". Where does SR end and GR begin, in today's textbooks (not internet forums)? Do accelerating frames (coordinate systems) belong to also to SR, or is GR needed? I say that they belong solely to...
  22. G

    Electromagnetism in Reference Frames

    If observer A was at rest with respect to a charge that was moving with a constant velocity |v| > 0 in observer B's reference frame, would observer A detect a magnetic field?
  23. A

    Reference Frames in Simultaneity

    Lets say that a person in a moving train throws a ball in the direction of motion from one end and hits the other end of the train at 10 mph (relative to the person on the train). According to special relativity, from the perspective of a platform observer though they would see the ball having...
  24. Y

    Two travelers both in Inertial Frames

    The twin thing has been beat to a pulp on these forums - so maybe this got resolved somewhere along the way - if so - someone can point me to the solution. Otherwise here is the set-up. Assume two satellites are placed in orbit around a black hole, one is in circular orbit, the other highly...
  25. J

    Quick Reference Frames Problem. Soon

    A ferry cross a river of width d. The speed of the boat is v relative to the water, and the speed of the tidal current is w parallel to the riverbanks. The ferry landing points are directly opposite each other on each side of the river. How long does the shortest return trip take? My attempt...
  26. A

    Galilean Relativity & Inertial Frames

    I just want to make sure I understand this correctly. Please critique: Under Galilean relativity, Newton's Law of Inertia retains the same form under any inertial frame of reference. There are relative velocities between inertial frames but its possible to determine absolute velocities under...
  27. A

    Relativity - space time interval between 2 frames

    Homework Statement In frame S, Herman drops a pizza at the same time that Pavel drops a marker. In frame S', Alice is moving relative to their S frame - What is the space time interval she sees? A. S' > S B. S' < S C. S=S Homework Equations Lorentz transformations is what we've been...
  28. W

    Transforming angular velocity between different coordinate frames

    Homework Statement There are two coordinate frames i.e. frame A and frame B. The relationship between them is that frame A is rotated w.r.t to frame B . This relationship remains fixed i.e. rigid body. This rigid body relationship is given by rotation matrix R_BA which transforms the vector in...
  29. O

    Do Laser Beams from Spacecrafts Travel at Different Speeds?

    Hey guys I don't think i have the correct solution to this question. I would say tht the laser beams would bothe reach the planet at the same time, but this just seems way too easy. Any hints/thoughts/suggestions on solutions to this question? Thanks Two spacecraft are flying towards a...
  30. A

    Change of vector in different frames

    I just read this in a text: The rate of change of a vector with respect to a fixed frame is same as that with respect to a frame in translation. But supposing it were a position vector then rate of change(velocity that is) is different in different frames translating with respect to each...
  31. P

    Relativity, reference frames and Lorentz transformations

    Homework Statement The system S' moves in relation to the system S with velocity \upsilon along the -x- axis. At the time when the beginnings of the coordinate system are in the same point, clocks in both system shows t=t'=0. Which coordinates will have a reference point during the motion in...
  32. A

    How does the energy and time dilation of objects moving at high speeds work?

    Assume you have two objects, with nothing else, moving directly away from one another, each at 51% of the speed of light. But, from the frame of reference of one object, the other is going 102% of c, an impossibility. How does this work? And: Those same two objects, which has more energy...
  33. C

    Speed of light in NON-inertial frames

    I haven't studied this very much, but how do EM waves behave in noninertial frames? Do photons have an acceleration in order to maintain constant speed c in the noninertial frame? What happens to the Lorrent'z force in non-inertia frames? A charge moving in a magnetic field is equal to a...
  34. E

    Inertial reference frames problem

    Homework Statement An example of an inertial reference frame is: A. any reference frame that is not accelerating B. a frame attached to a particle on which there are no forces C. any reference frame that is at rest D. a reference frame attached to the center of the universe E. a reference...
  35. R

    Solving Lorentz Transformations for Light Speed c

    Sorry, this is a really basic question which will possibly annoy you and I'm embarrassed to even be asking this :blushing: But if you travel at say 0.5c to the left (relative to your axes) and a photon of light goes past you to the right at c (again relative to your axes) what are the sums...
  36. W

    Calculation of angular acceleration (two rotating frames)

    Please see the attached figure.
  37. V

    How Does Charge Movement Affect Electric Field Perception in Different Frames?

    Charge 1=+e Charge 2=-e Charge 3=+e If chg3 moves along the positive x in a magnetic field directed in +ve y, it sees an electric field in the +ve z, then in this frame a chg 1 and 2 both in rest in the initial frame experience an electric field in the -ve z, with the positive...
  38. A

    Frames vs Lines of Simultaneity

    ------------Frames and Lines of Simultaneity---------------- Is there any difference between the two? If there is what is it?? I may be missing something obvious but as far as I can see they are just two ways of graphing and conceptualizing a singular entity. Thanks
  39. T

    Finding a Natural Frame of Reference on the Cosmic Scale

    I'm looking for a list of "natural" frames of reference on the cosmic scale. Something that can be used as "the" frame of reference for everyone in the universe that isn't arbitrary. So let's brainstorm about some potential candidates. The more the better. If need be, start with an idea and...
  40. J

    Solving Frames of Reference Homework: Static/Kinetic Friction

    Homework Statement A child sits 2m from the centre of a merry-go-round (a rotating wooden platform) which is rotating at 3.5revs/min in a clockwise direction (when viewed from above). She places a wooden block of mass m=0.25kg beside her on the platform. a)Draw a diagram showing all the...
  41. K

    Understanding Earth's Rotation: Impact on Reference Frames

    Urgent-About reference frames! Hi guy's. I thought about this for quite a while but could not convince myself to believe it. I may be wrong somewhere but still any help would be greatly appreciated. The question: Now the Earth rotates at a speed of 7.29*e^-5 rad/sec.,so that any...
  42. E

    Point charges in non-inertial reference frames

    Okay, in inertial reference frames, two particles with the same charge will always repel each other. Even if they were moving in parallel at high speeds, and thus producing magnetic fields, special relativity would come in and balance the forces from the electric and magnetic fields so that...
  43. C

    Simultaneity of Events in Different Inertial Frames

    if two events are simultaneous in an inertial frame, then they would not be simultaneous in another inertial frame as long as they are separated in space.Equally the vice versa is valid.Does this not imply that it would be possible for one to see someone to be born and to be dead at the same time?
  44. C

    Special relativity: local frames versus global frame in a loop scenario

    Take the following setup: A series of pulses of radio signal is relayed around the world, along the equator. There is no "gap", it is a continuous loop along numerous relay stations build along the equator. The total number of pulses is fixed at 648,000 - I'll explain in a minute why that...
  45. M

    Electromagnetic force on a particle in two different frames of reference

    Consider an infinitely long straight conductor carrying a current. Let's assume that the free charges in the conductor are positive and are moving at a drift velocity v. Now, consider a particle of charge +q also moving with v in the same direction as the current at a distance r from the...
  46. B

    Conserved kinetic energy in collisions in different frames

    Homework Statement How do you show that in the non-relativistic case, if KE is conserved in a collision as viewed in one frame, then it is conserved in all other frames moving with constant velocity? Homework Equations The Attempt at a Solution Not sure what to do... thanks
  47. M

    Apollo 11 launch at 500 frames per second

    http://www.petapixel.com/2010/04/26/apollo-11-launch-at-500-frames-per-second/ High speed footage of the Saturn V's engines starting and lift-off with a very informative technical commentary.
  48. I

    Accelerating frames and black holes

    I have a question that's been bothering me for a couple of days, and none of my professors have been able to answer it. Two observers, Alice and Bob, are initially at rest relative to each other. Bob begins a constant acceleration. I want to be specific; let's say his acceleration is g and...
  49. N

    Speed of light for accelerated frames

    is speed of light invariant for accelerated frames?
  50. ?

    Electricity and Magnetism: The Surprise Connection

    You have two like charges with the same velocity and a displacement between them perpendicular to the velocity. Moving charges produce a magnetic field. The charges should magnetically attract one another. Now consider the reference frame of the charges. There is no motion so no magnetic...
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