Two simple pendulum, whose lengths are 100cm and 121cm, are suspended – McqOptions

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1.	Two simple pendulum, whose lengths are 100cm and 121cm, are suspended side by side. Their bobs are pulled together and then released. After how many minimum oscillations of the longer pendulum, will the two be in phase again?
A.	11
B.	10
C.	21
D.	20
Answer» C. 21

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