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What Physics do you want to be explained?

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A guy uses a metal detector that creates a 175 kHz magnetic field. How long does it take to collapse.

 

You do 1/175kHz to find the period, which is one cycle. I thought collapse is when the cycle ended, so isnt that right? The mark scheme tells me to divide my answer by 4...

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I think the question is very wrong.

and don't ask school problems here

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What makes you think the question is wrong, and how come we can't post school problems. I am asking about what they mean really, because the markscheme doesn't really explain why I should divide my answer by 4.

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Hey if I travel at 99% of light speed will an observer at rest watching me see me moving slowly or quickly. Special Relativity really confuses me.

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its a theory to do with how fast you are going, and based on this speed how much your mass changes, how much time changes for you doing the moving - its complicated i cant get my head round it :P

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its a theory to do with how fast you are going, and based on this speed how much your mass changes, how much time changes for you doing the moving - its complicated i cant get my head round it :P

 

I know that's called relativity. Einstein's stuffs.

If it was just relativity then the answer for your query would be 'quickly'.

 

For special relativity, that what r-z reminds. :rolleyes:

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trolol what is the purpose of this thread?

 

The question was: What Physics do you want explained?

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