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Homework Statement
Alpha Centauri is ##4.4## light years away from Earth. What speed ##u##
would a spaceship headed towards Alpha centauri had to have in order
to last ##t' = 10## years for a passanger onboard?
Homework Equations
I know equations for time dilation, length contraction:
\begin{align}
\Delta t &= \gamma \Delta t' \xleftarrow{\text{time dilation}}\\
\Delta x' &= \gamma \Delta x \xleftarrow{\text{length contraction}}
\end{align}
and Lorenz transformations:
\begin{align}
\Delta x &= \gamma(\Delta x' + u \Delta t')\\
\Delta x' &= \gamma(\Delta x - u \Delta t)\\
\Delta t&= \gamma\left(\Delta t' - \Delta x' \frac{u}{c^2}\right)\\
\Delta t'&= \gamma\left(\Delta t + \Delta x \frac{u}{c^2}\right)
\end{align}
The Attempt at a Solution
The only thing i know how to do is to determine the proper time which is the one measured on a spaceship...
\begin{aligned}
\boxed{t'\equiv \tau}
\end{aligned}
By using the equations above i simply can't calculate any other variable because ##\gamma## is unknown and is present in all 6 equations...