Recent content by shanname

sorry, didn't realize I wasn't bolding \dot{r}.

Thank you, AlephZero. I believe I understand. I mean, I know that v is just another name for \dot{r} and the like, I just thought it could be rewritten in terms of v for that reason. No one ever explained that this is true specfically because v did not "depend" on r... is it ever the case that v...

My classical mechanics textbook says that, for a projectile, the linear drag force is given by f = -bv and the second law is written as m\ddot{r} = mg - bv (a second order differential equation) which can be rewritten as m\dot{v} = mg - bv (a first order differential equation) because the forces...

Why are you disregarding the y-component when you differentiate?

pushing the cart at a 0° angle would not produce a greater force--it would increase the work, if you calculate it with the original displacement and applied force: W = (50m)(35N)cos(0°). but the question is asking how the applied force would have to change, if at all, for the speed to stay the...

No lab for Optics, and we will be using Principles of Physical Optics by C. A. Bennett. According to its whopping 6 reviews on Amazon, it would be good if it wasn't filled with errors and typos (apparently in the tables and even the derivations). I imagine the professor will be difficult for us...

I am the girlfriend. The adviser seemed to think it is a manageable course load (without a job). He said Modern Physics I & lab and Mathematical Physics I were absolutely necessary to stay on track, and he strongly recommended taking both Thermodynamics and Optics. I believe he recommended those...

I didn't take physics I & II until the last 2 semesters at my community college. It took me ~1.5 yrs before I got to take physics I, due to the abundance of math courses I had to take. If taking a math class over the summer will keep you from having to stay an extra semester, I would do it. I...