Question

When the earth shrinks, without reducing its mass, what change will be there in the duration of a day?

Answer 1

$t = \frac{2\pi \: r}{v}$

by using this formula, the new time period is double of initial time period, thus the time period is 48 hr.

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Answer 2

Answer:

T=2pi r/v

The time period is double initial time period thus the time period is 48 hrs