Frames Definition and 638 Threads

If quasars are appearing to travel at almost the speed of light from us, what would the relative time frames between us be.

when I read what inertial frames I understand and it make sense but unfortunately when I try to apply what I understood on that question ,I can't illustrate these frames. Please help. question is that: I am standing on a level floor at the origine of an inertial frame ( S) and kick a...

I can't figure out the correct explanation for this gedanken. 1) We have a room in deep space which is shielded from external EM fields. The walls are lined with photon detectors. Inside is a charged ball attached to an insulating rod. The other end of the rod is on an axis and the rod is...

What is the difference in magnitude between the effects of normal doppler effect and doppler effect in accelerated frames, e.g. when the (light)source is accelerating wrt the observer? What is the formula for doppler effect in accelerating frames?

ok one of the postulates of special relativity is that the speed of light is constant in any intertial reference frame right? Has there been any experimental proof of this? When I learned this, my teacher mentioned the michalson-moray (spellings probly wrong) experiment that disproved the...

This is a highly theoretical question... so beware! The Work Energy(WE) equation in Mechanics says that the net total work done on an object due to various conservative and non-conservative forces equals the change in kinetic energy of the body. This above theorem is usually derived simply from...

Are you in inertial frames? hi, today my friend ask me 2 simple questions, too shame i cannot answer him...so i post it here: is the classroom an inertial system ?? Earth is rotating around the sun - so ...can still consider as inertial ? 2. If u working in laboratory to find so physics...

and is the momentum of a particle the same in all inertial frames? Thanks for any help

In flat spacetime, if you are at rest in a rotating frame, how would you be able to detect that rotation? For instance, on a small planet surrounded by nothing, how can a reference frame that rotates at the angular velocity of the planet be declared noninertial? Thanks for any replies.

Just a quick question here, that I've been having a bit of trouble figuring out: How do you calculate the energy of a photon in a frame if you know the energy of the photon in another frame as well as the relative velocities of the two frames? Thanks a lot.

After a dispute on the nature of kinetic energy on a previous topic, a new question has arised. If kinetic energy is different for each reference frame, then what happens with mass, considering the mass-energy equation?

The captain of a boat wants to travel directly across a river that flows due east with a speed of 1.48 m/s. He starts from the south bank of the river and wants to reach the north bank by traveling straight across the river. The boat has a speed of 5.64 m/s with respect to the water. What...

today my dynamics lecturer illustrated a situation to us where energy did not appear to be conserved. The situation involves observing the motion of a mass sliding down a slope, height 'h' above the ground from rest initially in the rest frame, we see; initially, PE = mgh KE = 0...

Suppose there is an inertial frame S in which there exists some object A at rest, located at (x,y,z)=(10^8,0,0). Now consider the non-inertial frame S' whose axes are coincident with those of S at t=0, but which is rotating about the common z-axis with constant angular frequency w. If S' has a...

hi can some body take me thru the meaning of frames in relativity.Also please if anyone has the links to the original paper of AE's do send them. thanks reg vln

Consider a magnetic field with a charge at rest in inertial frame S. From this reference point the particle is not moving wrt the magnetic field and will not experience a Lorentz force. Now consider a frame S' moving wrt S at a constant speed. An observer in this frame would see the charge...

http://uk.arxiv.org/abs/physics/0412039 Sounds off base to me, but I'd welcome an informed critique.

i was just reading, and i saw this question, and i don't know how to explain it... how can you describe why when two things go at a velocity v, and one of them accelerates to 2v, the KE gain w/ respect to the Earth and the other object are different, but the work done is constant? i just...

why is it that when two events occur simultaneosuly at separated points on the x-axis of reference fram S, the observer moving in the positive X direction sees the event withe largest x coordinate first shouldnt it be the smallest?

i've just started studying these but unfortunatley I've been unable to get my hands on the textbook, and my lecturer is... not that great :frown: Could somebody explain what these are to me? I have little to no idea about them as of now... maybe a few sample questions too? That would be a...

Could someone explain me in detail the differences between an inertial reference frame and a non-inertial reference frame? Are inertial frames restricted to Euclidean space?

gre problem: special relativity, two events in two reference frames 34. In an inertial reference frame S, two events occur on the x-axis separated in time by \Delta t and in space by \Delta x. in another inertial reference frame S', moving in the x-directon relative to S, the two events could...

1) Which object provides an inertial frame of reference? a. the tip of the moving second hand of a clock b. a rock thrown vertically upward c. a pendulum swinging with no air resistance d. a skydiver falling at terminal velocity At first I thought c might be correct, but now I am...

Hello all! I have a question on acclerating frames. The apparent weight of an object in an elevator that is accelerating upward is m(g+a), where g is gravity and a is the acceleration of the elevator. In my textbook they give an example of a crate placed on a scale at the equator. They want...

I have learned that objects moving at high velocity experience time dilation, among other things, and that there is no ultimate frame of reference in the universe. If this is so...say two galaxies pass by each other at near the speed of light...in which one would time be moving slower? There's...

Your standard first-post-pleading-for-help here :) This doesn't make sense: Say you've got a setup like in picture 1 (floor is frictionless) If the F readout on the scale is 18N, and the box is 5kg and F=ma, then 18N/5kg = 3.6m/s^2 = a, right? Okay... Now, if the velocity is...

how do you determine if something is a proper inertial frame of reference? the Earth is but a car isnt? you can feel a car accelerate, even though you are in it, but you can't feel the Earth accelerate as it changes directions in its orbit.. is there a poitn after which you don't feel...

hi folks! I have a question which had been haunting me for quite some time... can an observer sitting in a accelerating reference frame deduce that he is accelerating without establishing any contact with the outside world( i am alluding to outside the frame ambience)?

Is it possible to define one's identity (i.e. answer the question "Who are you?") without resorting to some sort of reference frame (e.g. "I am the son of so and so"), and if so, how? And for that matter, is there anything at all out there, which can be defined without a raference frame? I...

Do two observers in different reference frames necessarily agree on the energy of another object in a third reference frame?

A question that led to an interesting answer was posed in a newsgroup recently that I thought I'd share here. Someone proposed a scenario where there were two rocket ships that would travel at constant speed along a circle in opposite directions. They would pass each other twice per revolution...

I can make a local inertial reference frame in a gravitational field by creating a frame that is small but close to the source of curvature of space-time. Alternatively I can make a local inertial reference frame by creating a frame that is large but a long distance from the source of curvature...

Hey everybody, this is my first post! :biggrin: I've always had a problem understanding why, if a space-explorer left on a ship, traveled at nearly the speed of light for a while, and then came back to earth, he might have only aged a few months whereas the people of Earth would have aged...

Moving in Frames?? okay, so let's say I ran 3 miles. At one point, I must have been halfway between start and finish right? From the halfway point, I must have existed halfway from there and the remaining 1.5 miles also. And halfway between THAT point and the finish. Then halfway from THAT...

Suppose 2 inertial frames with relative relativistic velocities. To discuss phenomena in other frame, we need to use Lorentz Transform for length and time. I got question: do we have to also use LT to talk about permittivity and permeability of other IRF? This seems strange. Permittivity has...

1. Let clock A and clock B be of identical construction, and let them both not be subjected to any force. Let them be at rest with respect to each other. Thus, the relative velocity v is equal to zero. Therefore, using Newtonian mechanics or SR, the clocks tick at the same rate. For the...

If you take two identical radioactive samples, place one on Earth and another on a near-lightspeed spaceship, and compare them some time later, will the one left on Earth have undergone comparatively more radioactive decay than the one on the spaceship? If the experiment is repeated by...

What determines whether a boat goes upstream, downstream, or straight across? Is it be the angle that the boat is pointed, the speed of the boat and the speed of the river?