This is not a homework problem, but a math question of curiosity. At 57 I am way past courses and homework.
If a potential, V, is expressed as a volume integral, how does one apply Poisson's equation to that integral?
If V = k∫V'\frac{ρ}{R}dv' (V on the LHS is voltage and the integral on...
I believe you are wise beyond your years! I went back to this and tried it and it works! The problem is simpler than I was imagining.
Using Ta = Tb = Tc = 50 and then just summing from left to right:
Sum of external forces = 50 + 100 + 50 + 50 - 20(9.81) = 53.8N. The second 50N on the...
Fair enough.
I have tried a number of ideas and seem to end up with more variables than equations each time. The one item that vexes me is that I cannot figure out what Ta is. The tensions Ta, Tb and Tc are all the same, but with the steadily applied 100N force I am stuck on how to...
When you say add all the external forces, including the two strings to the ceiling, I assume you mean that the sum of the upward forces is 100N + 50N + 50N + Tleft, where the second 50N is from the fact that the anchor tension must be the same as the applied 50N. How do you determine Tleft...
Homework Statement
Not sure why, but I opened an old textbook (Dynamics - Engineering Mechanics, Meriam, 1980) and started paging through. I decided to try this problem (attached jpg) and got stuck.
The problem asks for the acceleration of the center of mass of the system of 4 weights...
Feynman's style
Crosson,
I agree that the cross product is the result of the negative sign on tau.
FWIW, Feynman's style is different than I have seen in any other physics book. Mostly I appreciate it, but not always. I suppose I have gotten used to a kind of consistency in those other...
Double use of negative signs
Crosson,
Thanks for your reply.
I understand what you wrote. However, it is the "package" of negative signs that I am confused by. That is, Feynman has to define tau with a negative sign (where he says in the pdf, "Setting tau = -uBsin(theta)". Since the...
In reading Feynman's "Lectures on Physics", volume 2 I have a question and have included a scan of a small section from the book.
Feynman was a big fan of using the Principle of Virtual Work, but his explanation, as least insofar as how he used it is wanting, at least for me.
The attached...
jtbell,
I know it is ridiculous, but I was doing the "thought experiment", Brin suggests, as to what would happen if...
So, what happens to the potential energy of the moon or satellite if the Earth mass is reduced in half suddenly. It seems to me that the question can be addressed purely...
In light of the Conservation of Energy principle, what would happen to the potential energy of the Earth's moon, or any satellite of Earth, if the mass of the Earth were instantaneously reduced by half? That is, is potential energy conserved, is it transferred to another form of energy or is it...
I have been looking at this paper (http://www.phys.unsw.edu.au/~jw/pendulumdetails.html) on the details of Foucault's pendulum. I am interested in understanding the details, but am having some trouble. My purpose is to study this as an example of how the analysis is done. I'd like to ask some...
Also trying to find Kolecki's rhythm
John,
I am also reading this trying to better understand tensors for my own edification. It would be great to have someone of the same bent with whom to discuss this topic. I am an engineer and probably have about the same level of formal math training...
I agree that there does not have to be a definition, I am wondering if there is. As an engineer I like physical definitions, but can live without them. Since complex angles are used in physics I can understand that there may be a physical definition.
Thomas
I may be on a wild goose chase here, but I am looking for a physical definition of a complex angle, i.e., an angle of the form a + bi. Is there such a beast or is a complex angle purely a mathematical construct?
Thanks.
Thomas