Recent content by ksy

I hadn't thought about the case of a>g! Yes then N would point in the -y direction all right lol! Then again it would be N from the ceiling rather than the scale. Ibik, PeroK, Chestermiller, thank you all very much for your help!

Hi, I was looking over one of the sample examples in Halliday and Resnick, the one about the scale in the elevator. There is something that bugs me about it, and I'd like to know if you agree. The example has to do with finding the reading of a scale that is measuring someone's weight in a...

Thanks a lot to both of you. So the problem would not arise for a solution like the one Ron Mallett's machine is based on?

I remember reading something, long ago, to the effect that any attempt at creating a CTC would be doomed by energy from vacuum fluctuations piling up through it and leading to explosive behavior (I think the idea originated in work done by Misner and Taub in 1969?). Does anyone know what is...