Q.

Two simple pendulums whose lengths are 100 cm and 121 cm 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

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a

11

b

10

c

21

d

20

answer is B.

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Detailed Solution

Let T1  and  T2  are the time period of the two pendulums T1=2π100g and  T2=2π121g   (T1
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Two simple pendulums whose lengths are 100 cm and 121 cm 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