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Tangeton

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^{2}against L, and so I also worked out T

^{2}for each lengths' period time, T.

I am stuck on the uncertainty. I have tired tried to work it out but when I do it for T I get 6.77%, and I do it for the spread of my results for T, but when I rise it to the power of 2 to get T

^{2}its 45.89%. I can't have such a huge uncertainty. And also I am worried because it is uncertainty in measurement but I can firmly say that I didn't measure T but 10T, and so should I do the uncertainty for average 10T instead?

What uncertainty would be the best to put down on my write up?

I'm an A Level physics student.

Thank you for all your help!