Power plant and barrier in code

You will write three functions about a power plant and about fusion.

The idea. A power $P$ in watt and an energy $E$ in MeV for each fission give $\dfrac{P}{E \times 1.602177 \times 10^{-13}}$ fissions each second. The mass of uranium-235 in a day follows from this rate and $N_A$. The electric barrier of two nuclei that touch is $1.44\,Z_1Z_2/d$ in MeV, with $d$ in fm.

Your tasks.

1. In fission_rate, return the fissions each second.
2. In uranium_per_day, return the mass of uranium-235 that fissions in one day, in kg. Use $0.235$ kg/mol.
3. In barrier_mev, return the electric barrier in MeV.