Frames Definition and 610 Threads

is centripetal force present in inertial and non-inertial frames?

Does speed of light Change with respect to accelerating frames It shouldn't be as gravitational time dilation exists

OK, this is a spin off from another thread, but it's an interesting topic in its own right. What I'm going to try to do is to give a rather physical interpretation of accelerated frames, specifically the Rindler metric, and a physical (rather than mathematical) interpretation of the Rindler...

A train of length 15cs moves at speed 3c/5. How much time does it take to a pass a person standing on the ground? [That is, what time elapses on the person's watch between the time when he is next to the front of the train, and the time when he is next to the back of the train?] Solve this by...

My textbook basically defines an inertial reference frame as follows: If you have an object O that has no forces acting on it, and there is a reference frame R where the acceleration of O with respect to R is zero, then R is a inertial reference frame. This to me seems circular. How does one...

Not sure how to go about proving that if E and B are perpendicular in one Lorentz frame they are perpendicular in all Lorentz frames.

Hi - I've just started having lectures on special relativity at uni. We were talking about inertial reference frames and how these can be characterised by the facts that: 1) They move relative to one another with constant velocity, and 2) Newton's laws operate in inertial reference frames...

A flash of light is emitted at point O and is later reabsorbed at point P. In frame S, the line OP has a length l and makes an angle theta with the x axis. In a frame S' moving relative to S with a constant velocity v along the x axis: How much time tau' elapses between emission and absorption...

c) What is the relative velocity of the two reference frames?

:confused: I am in desperate need of help with a certian physice question I am struggling on. here's the question: "A pilot is required to fly directly from london to rome, in 3.5hours. the displacement is 1400km [S 43degrees E]. a wind is blowing with a velocity of 75km/h [E]...

"In Principle, worldlines allow us to relate events on one another - to do sciecne without using reference frames at all". This was in Wheeler and Taylor's Intro to SR book. My question is, isn't this false? Because worldlines exist in a spacetime diagram. Vertical being time and horizontal is...

I have a few questions here, and I'm stuck/confused on some of them. Here they are: 1. The air speed of a small plane is 215 km/h.The wind is blowing at 57 km/h from the west. Determine the velocity of the plane relative to the ground if the pilot keeps the plane aimed in the direction [34...

i hope u can answer these ? for me please 1) how does einstein's special theory of relativity and inertial frames of reference explain and predict the behaviour of natural phenomena (weather)? 2)explain the conservation mass -energy as applied in special relativity? 3) what is the...

Hi! When we measure the Kinetic energy, which is the correct frame of reference that we must choose? Thanks :smile:

Hi, I've run into a relativistic kinematics question that I'm not sure how to approach. The question states: "A source and a detector are spaced a certain angle \phi apart on the edge of a rotating disk. The source emits radiation at frequency \omega in it's instantaneous rest frame. What...

under which conditions we could say that the same experiment is performed in different inertial reference frames. I have formulated for myself the following answer: We say that observers from two inertial reference frames perform the same experiment if the physical quantities they measure are...

Hi, Please help me, I can't make head or tail of the concept of an inertial reference frame. What is an inertial reference frame? In what fundamental way does it differ from a noninertial reference frame if all motion is relative? Thanks for your help. Molu

Energy is not an invariant quantity between different frames of reference. For example a particle having a kinetic energy in one frame has a zero kinetic energy in another frame. But what about interaction energy? If I know the interaction energy between 2 particles in one frame, how can I...

What is used to define an inertial frame in special relativity? Do I need to take one of the postulates as defining an inertial frame? What is bothering me is that I used to use Newton\'s first law to define inertial frames (a freely moving object will have a constant velocity). This can...

Consider two farmes of reference moving relative each other. In one of the frames the CMD is fully isotropic, i.e., it looks the same in all directions. In the other frame however, the CMD should be red shifted in one direction and blue shifted in the other direction. Thus, the first frame can...

A first spaceship S1 departs from Earth and quickly accelerates to a velocity V = c/2. S1 travels the shortest path (dead heading) toward a distant planet Alpha so that it arrives in 20 years as measured by a clock on S1. One year after S1 is launched from Earth as measured by a clock on the...

Is the comparison of the kinetic energy of a satellite in orbit around the Earth to that of a truck traveling down a road realistic? Are they in the same reference frame?

hi, in the case of elastic collision of two balls in constant speeds, if we took the origin in the center of of one of the balls, so the speed of the origin ball will be always zero, and the second ball will has the speed of v befor the collision and -v after the collision. so how the...

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...