Question: A rectangular block, with face lengths a = 35 cm and b = 45 cm, is to be suspended on a thin horizontal rod running

A rectangular block, with face lengths a = 35 cm and b = 45 cm, is to be suspended on a thin horizontal rod running through a narrow hole in the block. The block is then to be set swinging about the rod like a pendulum, through small angles so that it is in SHM. Figure shows one possible position of the hole, at distance r from the block's center, along a line connecting the center with a corner.
(a) Plot the period of the pendulum versus distance r along that line such that the minimum in the curve is apparent.
(b) For what value of r does that minimum occur? There is actually a line of points around the block's center for which the period of swinging has the same minimum value.
(c) What shape does that linemake?

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