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If an object is placed in a tunnel running through the Earth’s centre, it does simple harmonic motion. Calculate the time period for this. If radius of Earth is 6.4 × 106 m and mass is 6 × 1024 kg.

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Time period of simple harmonic motion of an object placed on the tunnel running through the centre of the Earth,

or T = 84.7 min = 85 min

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