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# Problem 3. The Twins Paradox. Question 1. Which basic principle of Special Relativity is used that...

Problem 3. The Twins Paradox.

Question 1. Which basic principle of Special Relativity is used that makes the Theory appear to fatally contradict itself?

a. the laws of physics are the same for all non-accelerated observers

b. the speed of light in vacuum is a constant regardless of the motion of the observer or the source

c. the laws of physics are the same for all accelerated observers

d. a and b

Question 2. What is the resolution of the paradox in terms of what the spacefaring twin experiences that the Earthbound twin does not.

a. the spacefaring twin is moving while the Earthbound twin is not

b. the spacefaring twin exceeds the speed of light in vacuum

c. the spacefaring twin experiences acceleration that the Earthbound twin does not

d. the Earthbound twin experiences acceleration that the spacefaring twin does not

e. none of the above

Question 3. The Special Theory of Relativity covers:

a. only nonaccelerated conditions

b. only accelerated conditions

c. both accelerated and nonaccelerated conditions

d. neither accelerated or nonaccelerated conditions

Question 1 Answer. Option a is correct. Laws of physics are invariant in all non-inertial frames.

In paradox taking the Earth as stationary frame, the spaceship is moving. So, the age of spaceship twin will be lowered than the Earth twin. But taking the space ship as stationary, now Earth is moving in opposite direction. So, age of the Earth twin is less than spaceship twin.

Question 2 Answer. Option C is correct.

Considering the ship as usual so,when ship is achieving speed it will be accelerated. But taking a hypothetical example that ship achieves it's speed in infinitesimal time or that is it is not accelerated, than option e is correct.

Question 3 Answer . Option a is correct.

Special relativity is only applicable to non-accelerated frames (non-inertial frames).

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