Weight on other worlds

A student has a mass of $58\ \text{kg}$. You will make the program find the student's weight on four bodies with $W = mg$, pick out where the weight is smallest, and find what a bathroom scale marked in kilograms for the Earth would show on the Moon. Then it draws the weights as bars.

The idea. The mass is the same everywhere; only the weight changes. A bathroom scale measures the pull and divides it by $9.8\ \text{m/s}^2$, so on the Moon it shows the wrong mass.

Your tasks.

1. Inside the loop, work out W, the weight on each body, in newtons.
2. Set lightest to the name of the body where the weight is smallest.
3. Work out scale_moon, what the bathroom scale shows on the Moon, in kilograms.