A uniform circular disc of mass 12kg is held by two identical springs as shown in the figure. When the disc is pressed down slightly and released, it executes SHM with a time period of 2 sec. The force constant of each spring is:

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236 Nm–1

118.3 Nm–1

59.15 Nm–1

None of the above

answer is C.

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Detailed Solution

As the two springs are connected in parallel keff = 2k

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