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A pendulum with a bob of mass 150 g has the same period as a thin...

A pendulum with a bob of mass 150 g has the same period as a thin rod of the same mass and length 42 cm when the rod is pivoted about its end. What is the length of the pendulum?

Answer options are

  • 13 cm

  • 21 cm

  • 14 cm

  • 28 cm

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