Question: Determine power of variable

Hi,

 

Lets say we have some expression like

0.5* t^5 * r^-1 *V

 

is there some way in maple to determine the power of the variable t ?

My goal is to realize a procedure [lets call it PowerOfT() ]  , so that

 

PowerOfT( 0.5* t^5 * r^-1 *V) = 5

 

Thank you very much for your help.

 

 

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