A uniform rod of mass m = 1.5 kg suspended by two identical threads l= 90 cm

Question:

A uniform rod of mass m = 1.5 kg suspended by two identical threads l= 90 cm in length (Fig. 4.t3) was turned through a small angle about the vertical axis passing through its middle point
C. The threads deviated in the process through an angle a = 5.0 °.
Then the rod was released to start performing small oscillations.
Find:
(a) The oscillation period;
(b) The rod's oscillation energy.

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