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## Homework Statement

The figure shows a ship (attached to reference frame S') passing us (standing in reference frame S) with velocity http://edugen.wileyplus.com/edugen/shared/assignment/test/session.quest2564447entrance1_N1002E.mml?size=14&ver=1463885870814 [Broken] = 0.952

*c*http://edugen.wileyplus.com/edugen/shared/assignment/test/session.quest2564447entrance1_N1004A.mml?size=14&ver=1463885870814 [Broken]. A proton is fired at speed 0.976

*c*relative to the ship from the front of the ship to the rear. The proper length of the ship is 760 m. What is the temporal separation between the time the proton is fired and the time it hits the rear wall of the ship according to

**(a)**a passenger in the ship and

**(b)**us? Suppose that, instead, the proton is fired from the rear to the front. What then is the temporal separation between the time it is fired and the time it hits the front wall according to

**(c)**the passenger and

**(d)**us?

## Homework Equations

L=L0*sqrt(1-ß^2)

t=t0/sqrt(1-ß^2)

## The Attempt at a Solution

Part a and c are easy, I simply used time=distance/speed since for the passenger it is the rest frame. However I was not able to get part b or d correct. I calculated the contacted length L=760*sqrt(1-0.952^2)=232.6344979m. And then calculated the time interval to be t=L/0.976c=0.798 microsecond. This was not the correct solution so I combined the velocities using the formula:

u + v

w = ---------

1 + uv/c2

where u=0.952c and v=-0.976c, and got t=L/w=2.29microsec

Please let me know which part I did wrong thanks heaps!

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