The focal length, like you said it's the distance between the FOCAL point and the mirror.
Trees
Animals
Grass
Minerals
Coal
Fossil fuels
Natural gas
When an atom of nuclear<span> fuel (uranium) absorbs a neutron, the uranium will </span>fission into two smaller atoms (waste) and release one to three neutrons. The kinetic energy of the waste is used to heat the water for the steam turbine. The neutrons are used to fission<span> the next lot of uranium atoms and the process continues.</span>
The volume of a cube is given by:

where L is the measure of each side (which corresponds to its width, since all sides of a cube are equal).
Plugging the data of the problem, L=32.1 cm, inside the equation, we find the volume:
