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Fermi problems and equivalents

3 fermi problems:

Q1) Estimate the number of atoms in a Trex?
Q2) What is 10amu in kg?
Q3) Estimate the number of hairs on a dog?

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Here are my estimates:


The esitimated weight of a T-rex is about 4 tons. If we assume that the averageatom in the T-rex is carbon (there are also calcium, oxygen nitrogen and ofcourse hydrogen), and we know that one mol of carbon has the weight of 12 grams, then we can see thet the number of mols of carbon in T-rex is:

m = (4tons) * (10^6 gr/ton) / (12 ...