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by you-know-who
February 20th, 2012, 10:06 am
Forum: 2012 Study Events
Topic: Fermi Questions C
Replies: 82
Views: 40955

Re: Fermi Questions C

One question: why is it that a number beginning with a digit 5 or greater is rounded to the next power of 10, and a number beginning with a digit less than 5 is rounded down? The event asks us to estimate the answer to the nearest power of 10, so that's equivalent to estimating the log of the answer ...
by you-know-who
February 19th, 2012, 8:10 pm
Forum: 2012 Study Events
Topic: Fermi Questions Marathon
Replies: 166
Views: 56345

Re: Fermi Questions Marathon

A pencil has dimensions 5E-3 m x 5E-3 m x 1.5E-2 m =3.8 E-7 m^3.
The box has volume 2E3 m^3

So 2E3/3.8E-7= about E10


Estimate 16^16

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