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I have a problem about dimension matchig.

the dimensional relation between the period

**τ**, the pendul length

**l**, and the acceleration of the gravity

**g**takes the form:

**[ τ ]=[l^r] [g^s]**

Use the fact that the dimendion of τ is [T], that of l is [L], and that of g is [L/T^2] to show that

**τ is proportional to (l/g)^(1/2)**

I dont get the soltuion right...

Thank you

brad