Answer:
When the earth shrinks, the moment of inertia \[\left( I=\frac{2}{5}M{{R}^{2}} \right)\]decreases about its own axis due to the decrease in radius R To conserve angular momentum. \[(L=I\omega =I.\frac{2\pi }{T}),\] the time period T decreases. That is, the length of the day decreases.
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