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Pendulum Period Equation: Vary Length and Mass

APPH12-DKYHNL

What is the period of a simple pendulum with a length of $3L$ and a mass of $2M$?

A

$2\pi \sqrt { \cfrac { L }{ g } }$

B

$2\pi \sqrt { \cfrac {3 L }{ g } }$

C

$2\pi \sqrt { \cfrac {6M L }{ g } }$

D

$2\pi \sqrt { \cfrac { 3L }{ 2Mg } }$