7. REASONINGThe centripetal acceleration is given by Equation 5.2 as ac= v2/r. The value of the radius ris given, so to determine acwe need information about the speed v. But the speed is related to the period Tby v= (2πr)/T, according to Equation 5.1. We can substitute this expression for the speed into Equation 5.2 and see that avrrTrrTc===222224/bgSOLUTIONTo use the expression obtained in the reasoning, we need a value for
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