I don’t really get the point of this. Who should know these? Why should they know them? What should they know about them? As a mechanical engineer, for inst

I don’t really get the point of this. Who should know these? Why should they know them? What should they know about them? As a mechanical engineer, for instance, it’s usually a bad idea for me to think about these equations - it’s to “in the weeds”, so to speak.