- #1

MathematicalPhysicist

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or more precisely how do you compute the age of the man who stays in earth while the other one in the spacecraft has spent a year in the vehicle?

thanks in advance.

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- Thread starter MathematicalPhysicist
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- #1

MathematicalPhysicist

Gold Member

- 4,494

- 278

or more precisely how do you compute the age of the man who stays in earth while the other one in the spacecraft has spent a year in the vehicle?

thanks in advance.

- #2

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Originally posted by loop quantum gravity

or more precisely how do you compute the age of the man who stays in earth while the other one in the spacecraft has spent a year in the vehicle?

thanks in advance.

For the unaccelerated parts of the trip, you use

T

For those parts where the spacecraft is undergoing acceleration, you use

T

To find v after time t

v = c * tanh(at/c)

- #3

MathematicalPhysicist

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does t0 for the person in earth?Originally posted by Janus

For the unaccelerated parts of the trip, you use

T_{0}= t_{1}/[squ](1-v²/c²)

For those parts where the spacecraft is undergoing acceleration, you use

T_{0}= c/a * sinh(at_{1}/c)

To find v after time t_{1}at acceleration a:

v = c * tanh(at/c)

- #4

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Originally posted by loop quantum gravity

does t0 for the person in earth?

Yes.

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