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alphabeta
 one year ago
I used a ruler and found the uncertainty to be +/ 0.05cm. If I used the ruler twice when measuring, should I just multiply the original uncertainty by 2, or how does it work?
alphabeta
 one year ago
I used a ruler and found the uncertainty to be +/ 0.05cm. If I used the ruler twice when measuring, should I just multiply the original uncertainty by 2, or how does it work?

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IrishBoy123
 one year ago
Best ResponseYou've already chosen the best response.1best case is you luck out and are out by \(+ 0.05\) then \( 0.05\) , or \( 0.05\) then \(+ 0.05\) , as the errors cancel, but you are trying to cancel the the theoretical uncertainty, ie huch MIGHT you be out  so you need to look at worst case: ie you could be out by \(+ 0.05\) both times; or \( 0.05\) both times so you are certain to within which overall tolerance?

alphabeta
 one year ago
Best ResponseYou've already chosen the best response.1Ok, so if I understand you right, my new uncertainty (if we look at the worst case scenario) would be +/ 0.1?

alphabeta
 one year ago
Best ResponseYou've already chosen the best response.1Woho, thanks for your help!
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