A big meteor fell from the sky in Russia. Could we do some calculations on it?

Yes we can!

see: http://www.bozon.org/tweets/Russia-Rock.pdf

Based on simple calculations I've estimated the amount of kinetic energy the object had to be around 1/4 kiloton TNT. So approximately 50 times smaller than Hiroshima. Still a respectable amount of energy.

In addition a simulation of the results if the rock was a little bigger & a little faster... (actually an order of magnitude)

Please note: above simulation assumes all the energy is released at once several hundreds meters above amsterdam. In reality the results will be far less devastating.