[rwallace]

The honest answer is, unless your profession is in the physical sciences or hardware engineering, learning physics from this or other sources will probably not be useful.

Whether it's worthwhile is to at least some extent a value judgment, and also as I see it, depends to some extent on what else you would have done with the time. If you have a block of time allocated for work, and you're thinking of spending it reading about physics instead of reading documentation on something you do actually need, that's probably suboptimal. If you've finished work for the day, you have a block of time allocated for intellectual leisure and you're trying to decide between reading about physics versus, say, the latest Dungeons & Dragons rules, in my opinion the former is more worthwhile.