Recent content by the-genius

Homework Statement There Are two bodies with mases M1 and M2 placed in space separated by a distance D. They attract each other due to gravitational forces and hence acclerate towards each other.The problem is to Find out the time taken before their collision? Homework Equations I know...

For whom is the pole shorter than the Barn? Fredrik. ----I think you mistyped it. Anyway--- I am thinking like this Ok, the runner goes inside, just when front end of the pole is about to escape out of the barn, front door slams in (and if he could breakthrough it, just when the back end goes...

What you all are missing is I think, globalization of inertial frame. How can we consider (according to your theories) Earth as inertial frame as it is in constant (centripetal) acceleration due to rotation around the sun. What i mean to say is, inertial frame are not global they are relative...

I think there is an interesting consequence of this time dilation. After return since the traveling twin is younger, it implies that he he is bacward in time. So, even though he may occupy same position in space with another twin (means he hits the other twin), he is at different time, so he...

How do you distinguish global and local inertial frames, atyy, please please explain in your own words (I wouldn't like a link to a lengthy explanation with difficult maths, I just need the concept)

Ok, fine Fredrik. But it may be interesting to see what the still observer sees. As he sees, both doors closing simultaneusly will he see the first door break even befor it is closed or what?

I didn't mean that Cantab Morgan. I meant, suppose you needn't need to use your rocket engine, simply an external gravitational field (my be from a star) will acclerate you. Your trajectory in falling elevator will be the required trajectory that the twin has to follow if the twin is also...

Al68, if you are in a box free-falling (acclerating with g) on earth, would you consider this box, a inertial frame of refernce? If no, then why not? If you leave a ball ball here, it will obey F=ma (at leat for you). If you throw it, it will move in constant line with respect to you, following...

It has this to do with the twins. If you can't tell in this case, the traveling twin too, can't tell if he is acclerating (due to this time not by the rocket engine but by gravitational field that acclerates every thing on the rocket (like the case of free fall)). So, the condition appears to...

I am asking the very question, what experiment would he carry out to test whether he is in inertial frame or not.. (but remember that if he is provided a fictional force so should every objects he will experiment with.)

You din't quite get me Cantab Morgan. If you are in a closed box and in free fall (acclerating towards earth), then if you let go your pencil, it will still appear to float, However, from the precpective of earth, you and the pencil are both acclerating towards the earth. How can you tell you...

How does person A knows (by mere looking) that the ball is going straight due to frictional force but not because Its in inertial frame. I think he will be free to say anything.

How do you FEEL cantab Morgan?\ You will feel that you are acclerating only when the forces(that accelrates you and the rocket) on the particles of your body are applied by say the wall of the rocket. If every-particle of your body were to fire their own rocket (very hypothetical) you won't...

While explaining about inertial and non-inertial frame of reference, people give this example-- http://www.phys.unsw.edu.au/einsteinlight/jw/module1_Inertial.htm if you don't wish to follow the link, here is a simple explanation---> there are two person and a rotating disk. Person A is in...

In the pole and barn paradox, if the observer (person A) closes the both doors simultaneusly (with respect to himself), when he sees the runner's stick (person B) is just inside and keeps it closed forever after that, how will things happen, will the runner be traped or the door will hit the...