A uniform disk turns at \( 2.4 \mathrm{rev} / \mathrm{s} \) around a frictionless axis. A nonrot...

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A uniform disk turns at \( 2.4 \mathrm{rev} / \mathrm{s} \) around a frictionless axis. A nonrotating rod, of the same mass as the disk and length
\( \mathrm{P} \) equal to the disks diameter is dropped onto

W the freely spinning disk (see the figure). They then both turn around the axis with their centres superposed. What will be the angular frequency in rev/s of the combination when they start rotating together?
(1) \( 1.2 \mathrm{rev} / \mathrm{s} \)
(2) \( 2.0 \mathrm{rev} / \mathrm{s} \)
(3) \( 1.44 \mathrm{rev} / \mathrm{s} \)
(4) \( 0.96 \mathrm{rev} / \mathrm{s} \)
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