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When doing physics problems, we'll often be required to calculate the numerical value and determine the units of a variable in the equations. The numerical values usually aren't too difficult to get, but , the same can't be said for the units. These units deal with dimensional analysis, which is a useful method for determining the units of a variable in an equation. A main use of dimensional analysis is in checking the correctness of an equation which we have derived by algebraic manipulations. Even a minor error in algebra can be detected because it will often result in a dimensionally incorrect equation.

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