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Imagine a tunnel is dug along the diameter of the earth. Show that a body dropped from one end of the tunnel executes simple harmonic motion. What is the time period of this motion? Assume the earth to be a sphere of uniform mass density=5520 kg m^-3 and G=6.67×10^-11 Nm²/kg².
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acceleration 5520 maintain density by gravitational force of Earth
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