# Simple conceptual and calculation relativity

• seto6
In summary, the stars explode simultaneously in the rocket's frame and the person in the rocket sees the flash from star B first due to their motion towards it. The time difference between the two flashes is 0.
seto6

## Homework Statement

you are flying your personal rocket craft at v=o.9c from star A to star B. The distance between the stars, in the stars' reference frame is 1.0ly, bother star happens to explode simultaneously in your reference frame at the instance you are exactly halfway between them.
do you see the flash simultaneously? if you do explain how. If you do not, which do you see first and what is the time difference the two flash.

## Homework Equations

umm sure non needed.

## The Attempt at a Solution

well ik that star B explodes first in rocket frame then star B explodes.(i know the explanation)

im having a hard time finding the time difference!... if some one can give me a hint to approaching the problem it would be good!

Last edited:
help..

i am trying my best, it would really be helpfull if someone would help me please and thank you.

Why do you have to go from rocket's frame to the star's frame and then go back to the rocket's frame? If the question asks something about the observation in the rocket's frame, it's better to consider the situation in the rocket's frame.
In this frame, you see that when you're right in the middle of the stars, they explode. Then there is "flash". What is this "flash"? What is the flash's speed? From the fact that you're half way between the stars, can you deduce the distance that each flash has to travel to reach you? How is each distance of each flash compared to the other?

What's your explanation for the relative timing of the flashes? (@seto6)

I second hikaru1221's suggestion of looking at the event in the rocket's frame.

the stars do explode at the same time in rocket frame but since the person in the rocket is moving towards star B, the person in the rocket will see the star B explode first then star A exploding. there is a delay between the explosion

In the rocket's frame, what is the motion of the person in the rocket?

i see rockets frame is persons frame there for explode at same time so...change in t =0 correct?

If I understand you correctly, yes, that's correct.

## 1. What is the concept of relativity?

The concept of relativity is a fundamental principle in physics that states that the laws of physics are the same for all observers, regardless of their relative motion. This means that the laws of physics are not affected by an observer's perspective or frame of reference.

## 2. How does relativity affect calculations in physics?

Relativity can affect calculations in physics by introducing mathematical equations that account for the effects of time dilation and length contraction at high speeds, as well as the curvature of spacetime in the presence of massive objects.

## 3. What is the difference between special and general relativity?

Special relativity deals with the laws of physics in inertial frames of reference, while general relativity takes into account the effects of gravity and acceleration on the laws of physics in all frames of reference. General relativity is considered a more comprehensive theory than special relativity.

## 4. Can the effects of relativity be observed in everyday life?

Yes, the effects of relativity can be observed in everyday life, although they are usually very small. For example, GPS systems need to account for the effects of relativity in order to accurately calculate the location of a receiver on Earth.

## 5. Is relativity compatible with other theories in physics?

Yes, relativity is compatible with other theories in physics, such as quantum mechanics. However, there are still ongoing efforts to reconcile the two theories and create a unified theory of physics.

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