Astronaut traveling what effects would she feel?

[goWlfpack]

astronaut traveling.. what effects would she feel??

Homework Statement

An astronaut is traveling in a rocket in outer space in a straight line at a constant speed of 0.5c. Which of the following effects would she experience?

Her heart rate would change.
She would feel heavier.
She would find it harder to breathe.
Some of her dimensions would be shorter.
None of these effects would occur.

Homework Equations

The Attempt at a Solution

i thought all of them (except the last would occur) i know that she would feel heavier and i know that it would be harder to breath. I am pretty sure the heart rate would change because of the speed, and the dimensions would be shorter because she is traveling so fast right?? or would her dimensions be the same b/c her frame of reference is moving that fast too??

 

[CompuChip]

In special relativity, what clocks and rules are affected by time dilatation and length contraction, respectively?

 

[goWlfpack]

well with length contraction, if the observer is moving, objects appear shorter if they are stationary, and a time interval to an observer in motion will appear longer then an observer at rest. So the heart rate would seem slower?? but would it actually change?

 

[CompuChip]

Well, the point is, that time intervals of one observer A will appear longer for another observer B (in relative motion) but not for A himself. Similarly for length contraction.

So, for example, would she have to had taken length contraction into account while building the bed on board her spaceship before departure?

 

[goWlfpack]

Well, the point is, that time intervals of one observer A will appear longer for another observer B (in relative motion) but not for A himself. Similarly for length contraction.

So, for example, would she have to had taken length contraction into account while building the bed on board her spaceship before departure?

oh ok, so b/c in this case the observer is moving the time intervals will not seem any different? so heart rate stays the same. The dimensions should as well then, b/c the area she is in is moving at the same speed as her.
she would feel heavier though and find it harder to breathe b/c of the pressure and the force of gravity working against her right?

 

[CompuChip]

Do you find it hard to breathe while traveling at 30 km/s through space?