Everywhere I've been, the only place that indicates that you're taking an online class is where it usually lists my room number. As long as the adcoms don't get that, you should be fine.
That being said, unless Physics comes very naturally to you, it may not be wise to take it when you have a massive course load. Some people find it easy, and good for them, but for others, it can end up taking a LOT of studying. If you're in an online class, I would imagine there being a lot of homework to offset the inability to give you pop-quizzes and so on.
Not only that, but since Physics is a math-based class, it can be extremely difficult to ask and have answered any questions, since text can only do so much. You're going to need to make sure that you know exactly which symbols you use for a given variable (since it seems most professors seem to have their own personal arsenal that they don't share with the world for many of them) and that you have no problems drawing diagrams based purely on text.
If I were you, I'd personally just wait until I could get into a lecture, not necessarily because the lecture itself is going to help you, but rather because the notes you take in a lecture will be your own, and it will make it that much easier to understand what you're supposed to be reading.