# physics

1. ### Truss Calculator problem

Hi all :), below is a truss I simulated in a truss calculator. Just wondering, how to solve for the the compression and tension of each member and are there any method that can solve this? This is not homework, I just want to build a truss calculator app so I need to understand the physics...
2. ### Field theory and electronics circuit

Hello Guys, I was reading the article about the What is Electronics in the link : What is Electronics written by Ralph Morrison. I was stuck at the following paragraph called Field Theory. after reading it two times, I am still confused and could not describe with Maxwell equation what really he...
3. ### Why can a radar with circularly polarized antenna not see a conductive surface?

We know that conductive surfaces reflect the radar signals very well and the radar sees the surface. Why this is not like that when the antenna is circularly polarized?
4. ### Number of atoms in helium liquid

Hello I have a question in my exercise that I need to ask about . the number of atoms in a helium liquid particle whose size is 0.708nm (I did not want to say lattice constant because I imagine helium liquid does not have a lattice structure because it is not crystalline.) Another...
5. ### Continuum of nanoparticles (cobalt ) meaning

Hello i am doing an excercise and they asked me to tell if a cobalt crystal is continuum or not ? But i don't know the meaning of continuum , and can not find it on internet either . Can you please give me the definition of continuum ? like continuum of cobalt nanoparticle thanks
6. ### A quick question about thermal voltage

I was skimming around G. D. Mahan's Condensed Matter in a Nutshell and came across a pretty interesting nugget: $\varepsilon (k) = \frac{\hbar^2 k^2}{2 m^*} \sim k_B T \,.$ (It's important to draw a distinction between $$k$$, which is the lattice's wavenumber, and $$k_B$$, which is the...
7. ### How do you solve the following dependent circuit problem? I tried to use KVL to get i1, but I got .44, which is the wrong answer.

Circuit problem: I have the answers to it, but I need to know the process of how to get there.