Question

The order of magnitude of seconds in a day is ${10}^x$. What is $x$.

Answer 1

We know that there are $60$ seconds in a minutes, $60$ minutes in an hour and $24$ hours in a day. Round that off to $100$, $10$ and $100$.
That is ${10}^2\times {10}^2\times {10}^1={10}^{5}s$
Hence, its magnitude of seconds in a day is ${10}^{5}s$