Frames Definition and 610 Threads

kindly be descriptive

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...

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...

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...

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...

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...

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...

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

Can we built the [SIZE="4"]small passenger car [SIZE="3"]body using [SIZE="4"]ANY WOOD which is [SIZE="7"][SIZE="5"][SIZE="4"]STRONGER and [SIZE="5"][SIZE="4"]CHEAPER? If so, name the wood.

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...

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)...

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...

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?

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

Please see the attached figure.

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...

------------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

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...

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...

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...

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...

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?

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...

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...

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

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.

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...

is speed of light invariant for accelerated frames?

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...

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...

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...

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

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...

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...

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...

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...

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...

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...

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...