Make a list of formulas to calculate uncertanties and a brif explanation in which cases we would use them. The images attached show how to calculate the uncertainty of the density, and the second how to calculate the uncertainty of the mass using the centripetal force formula. The thing is, they are different ways of calculating uncertanties, and I also know we can calculate it using the formula for propagation of uncertanties, but I do not know in which cases I should use them, and thats what I want you to do, list them and when sould I use them.

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Half Life

The concept of Half Life has numerous practical applications some of them includes figuring out the effective drug dosage to finding out when a radioactive becomes safe to use. If you look for a career in Nuclear Physics you will need this concept.