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प्रश्न
Two simple pendula of length L and 4L are pulled aside to the right and are at rest so that they make an angle 30° with the vertical. They are then released simultaneously at time t = 0. The time after which they will be in phase is ______.
विकल्प
`pi/2 sqrt("L"/"g")`
`pi sqrt("L"/"g")`
`2pi sqrt("L"/"g")`
`4pi sqrt("L"/"g")`
MCQ
रिक्त स्थान भरें
उत्तर
Two simple pendula of length L and 4L are pulled aside to the right and are at rest so that they make an angle 30° with the vertical. They are then released simultaneously at time t = 0. The time after which they will be in phase is `underline(4pi sqrt("L"/"g"))`.
Explanation:
`"T"_1 = 2pi(sqrt("l"/"g")), "T"_2 = 2pisqrt((4"l")/"g") = 4pi sqrt("l"/"g")`
T2 = 2T1, clearly after T2 both will be at origin and also in phase.
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