Recent content by riddledum

  1. R

    Time dilation and length contraction at relativistic speeds

    Woops, saw what I did wrong there & Got the right answer immediately. Thanks a lot!
  2. R

    Time dilation and length contraction at relativistic speeds

    What am I doing wrong here? t' = t*sqrt(1-v^2/c^2) t' = 100000*sqrt(1-0.9c^2/c^2) t' = 31622.7766
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    Time dilation and length contraction at relativistic speeds

    Managed to solve both 2 and 3 now
  4. R

    Time dilation and length contraction at relativistic speeds

    As always, I have trouble getting started and getting my head around what to do and how. Some small tips to get started would be appreciated.
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    Time dilation and length contraction at relativistic speeds

    Hi guys and girls. Need some assistance with these problems, not the hardest examples, but I need some help on the way. Homework Statement 1. An astronaut travels at 0.9c across our galaxy, which is 100 000 light years in diameter. How long time will it take (according to the...
  6. R

    Speed of ball exiting a loop-de-loop with 0.0675 m radius

    The whole thing looks like this: http://pici.se/pictures/mnClqYBkT.jpg The end is at the same height as the point where the velocity of the ball is 2.16 m/s
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    Speed of ball exiting a loop-de-loop with 0.0675 m radius

    My physics teacher gave us this follow-up to the classic loop-de-loop assignment where you have to calculate the height from where you have to drop a ball in order for it to just make it round the loop. The problem with this assignment is that our teacher refuses to help us, and there are no...
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