# What is Outside: Definition and 469 Discussions

Outside is an American company and magazine focused on the outdoors. The first issue of Outside was published in September 1977.

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1. ### I Can angular motion exist outside of a gravity field?

I can't find the answer anywhere here's my question. can a centrifuge exist outside a field of gravity. More specifically, in a theoretical void of nothing without stars in view or any point of reference for comparison how could motion like spinning or acceleration exist?
2. ### A How to take a matrix outside the diagonal operator?

How to derive (proof) the following trace(A*Diag(B*B^T)*A^T) = norm(W,2), where W = vec(sqrt(diag(A^T*A))*B) & sqrt(diag(A^T*A)) is the square root of diag(A^T*A), B & A are matrix. Please see the equation 70 and 71 on page 2068 of the supporting matrial.
3. ### I Black Holes: Event Horizon Causally Disconnected?

I've heard quite frequently that events inside the event horizon of a black hole are causally disconnected from the rest of the universe. I take it to mean that while outside events can interact with the events inside of the horizon, the reverse is not true i.e. inside events cannot interact...
4. ### I The Effect of Wind on the Rate an Outside Spigot Freezes

Suppose one forgot to protect outside water spigots against below freezing winter air. If there is a stiff wind, will, as I think, the spigot freeze sooner than if the air is calm at the same temperature? Also, wouldn't the case of calm air actually be more complicated to model because the...
5. ### I Image appears outside of q -- Lens Maker's Equation confusion

Summary: Does the image distance q in the lens-maker's equation mean where real images form or where any image at all forms? If the former, what separates the real image from all other reflections? Hi all, I attached a series of images taken with a camera for a concave mirror, the Pasco...
6. ### I Calculating the thermal coefficient between the insulated interior of a telescope instrument package and the cold ambient air outside

I've built an insulated chamber to protect a sensitive instrument at freeze temperatures in the winter. The instrument is mounted on a telescope, so the heat inside the chamber will slowly dissipate in the ambient. A digital PID thermostat is used to keep the temperature at a safeguard level...
7. ### I Why is there no induced charge outside of the conductor?

If we put a positive charge outside of a conductor, there is an induced charge, but if we put a positive and negative charge inside a conductor, there is no induced charge?
8. ### Using command line parameters outside of main function

I would like a program to read in a file entered by the user via the command line, which is then used in the main body of the code. See example code below: #include <iostream> #include <fstream> struct run_t { std::string file; }; run_t run; const POINTER* ptr = toy(run.file,0); int...
9. ### B Traveling outside of the Earth's atmosphere

If outer space is a vacuum there is no force in a vacuum to create friction, therefore if a vehicle i.e. spacecraft space shuttle is it a vacuum and produces any amount of thrust it should move a constant through space continuing to add thrust will only make the craft move faster until it...
10. ### Displacement Electric Field Outside Dielectric Material

I know that inside region 1, the D-field is zero as it is a conducting sphere, the E-field must be zero. It makes sense that in region 2 (inside the dielectric) there is a D-field. My question is, is there a D-field outside the dielectric material (r>R)? Obviously there will be an E-field, but...
11. C

### Why does a specific temp feel different inside depending on the temp outside?

If it's 20degrees outside and 68degrees inside it's warm when you come in from the cold. If it's 100degrees outside and 68bdegrees inside if feels cool. 68degrees is constant. Why does it feel different depending on the temp outside?
12. ### Potential outside a grounded conductor with point charge inside

Potential inside is given as in ,https://en.wikipedia.org/wiki/Method_of_image_charges, which is the sum of excitation and induced potential. When the charge is outside it is easy to argue potential is zero in the sphere. But when we have charge inside and image outside, what is potential...
13. ### How would you go about studying physics outside of university?

I think I want to pursue physics, but I can't seem to keep up with the pace of a university class. I also don't like the format. How would you go about doing this?
14. ### Expression for Electric Field Outside Sphere

I'm not quite sure where to start. If someone could help me I would very much appreciate it.
15. ### I What part of physics describes what happens just outside of an electron?

Coulomb's law for three dimensional space is an empirical law that describes the forces between two stationary point charges and is defined as: \vec{F}=\frac{K q_1 q_2 (\vec{r}_1-\vec{r}_2)}{|\vec{r}_1-\vec{r}_2|^3} From Coulomb's law, the magnitude and direction of an electric field produced by...
16. ### I Probability of finding a particle outside its light cone

Say we just created a particle (high probability of one-particle state), is the probability of a very far away detector getting triggered at the time of creation (probability of finding a particle outside of its light cone) zero according to QFT? Since we can detect particles and make...
17. ### Potential Inside and Outside of a Charged Spherical Shell

So here was my first go around at it: At first it made sense in my head but don't think my process is correct. Then i noticed the example in the book: I guess the reasoning isn't 100% there in my head and if i don't have an actual σ, how will i cancel out any legendre polynomials due to...
18. ### Rate of heat flux from from hot gas in a pipe to water outside

I have solved the first 2 parts. For the 3rd part, I have obtained the equation: T(x) - T0 = (T1 - T0)e^(-Φx/fc), where f = fm in the question. How do I obtain that expression for H? Thank you!
19. ### Electric Potential of point outside cylinder

Edit: Below is my work but i believe i have chosen the wrong values of the separation vector in the s direction. Any ideas as to what it should be?
20. ### B Black Hole Observation: Outside Observer & Spherical Symmetry

I know that for the infalling observer the horizon is a fake singularity that can be removed via the Eddington-Finkelstein co-ordinates but wouldn't the classic Swartsheild co-ordinates still apply for the outside observer? So, while for the infaller it takes a finite time, the outside...
21. ### Undergrad research opportunities outside of university

Given the state of affairs with COVID and its effects through closures of "unnecessary" services and colleges working more online for the time being, does anyone have advice on how to go about gaining physics research experience outside of the university? At this point, I'm about 18 months...
22. ### E-Field immediately outside a charged conductor

Griffith's says this, and I'm not exactly sure why... If you had a solid, spherical, and externally induced conductor... Does this mean that IMMEDIATELY outside, when you're infinitesimally close to the surface, E looks like this? If you surround the entire conductor with a Gaussian surface...
23. ### Why is the CO2 level lower in my house than outside?

How is this possible? I can't think of what could be absorbing Co2 inside my house, when I am producing it at a pretty high rate. I have my HVAC running on a frequent cycle mode also. I have no plants. The sensor...

25. ### How to surround myself with other physicists/students outside of academia?

Hey, I figured the general discussion would be the most appropriate place for this discussion. I finished my PhD a couple years ago and moved to my original country. I still keep in touch with my previous adviser as we are still working on my thesis research, which is great. However, because of...
26. ### What is the meaning of electric field "immediately outside the surface"?

Today when I am reading Griffith's electrodymamics on surface charge and force on conductors, I have come across two very ambiguous terms: electric field at the surface and immediately outside the surface. The context of these two words is as follows: The electric field immediately outside is...
27. ### Magnetic Flux outside of a long solenoid

I have been reading Griffith's Introduction to Electodynamics and i am currently at the chapter about magnetostatics. There is an example about a long solenoid with n units per length and radius R that shows a way of finding the magnetic vector potential. The magnetic field inside the solenoid...
28. ### "Open to the outside" of the cell?

Summary:: What does this mean? Discussion changed to meaning of words - moved from Biology When a channel in a plasma membrane (or really anything else in everyday life) is "open to the outside" of the membrane (or wall), what does that mean? Does that mean if you're standing outside of it then...
29. ### What percent of the universe is outside of galaxies?

Summary:: What percent of the universe is outside of galaxies? Hello, What percent of the universe is outside of galaxies? I need this information for a writing piece I am doing. I need specifically to be able to state that if someone was to randomly relocate to somewhere else in the...
30. ### Best outside color for thermal insulation

I'm wondering if the outside color has an influence on the thermal depletion of things such as a thermos, a wall, etc. Assuming, obviously, there's no sunlight hitting on them. It certainly has, but what difference percentage can we typically expect for example for bottles such as the ones on...
31. ### Solving Potential of a Charge Outside a Sphere with Green Functions

I was wondering if there is a way to deduce the solution of the potential of a charge outside a sphere given by the image method, though Green functions. Because of a Dirichlet condition (GD(R,r')=0), I know that a solution can be written as GD=Go+L, where ∇2L=0. But in order to approach this...
32. ### Determine the magnetic field inside and outside the cable using Ampere's law

My attempt: I realized after i had tried to solve the problem that the current must be constant in the cables. But no information about where the cables has radius a and b is given so how would I go about to find an expression for the current? Thanks in advance!
33. ### Can a window-mounted air conditioner suck in air or particulates from outside?

I read before that room air conditioner is not supposed to suck in air or particulates/dusts from outside but my air quality monitor can detect some increase in pm2.5 particulates when the aircon is opened. Is it because its sucking those particulates from outside or the fan of the air...
34. ### Misc. Mechanism or method to unlock a window from the outside?

Hello, I hope this is the right place to post about this. I live in a multi-unit condo, and I have a window that I am trying to lock and unlock from the outside. The window is from the kitchen and looks out onto a public-ish breezeway where I can access easily. I know this might seem a...
35. ### B Neutron Decay Outside of a Nucleus Near Absolute Zero

Does neutron decay outside of the nucleus occur faster, slower, or at the same speed when the environment it is in is near absolute zero? Do any external factors affect the speed of a neutron decaying?
36. ### Magnetic field outside a solenoid

In his book on electrodynamics, Griffith talks about the magnetic field outside a solenoid. Firstly instead of dealing with a typical solenoid with closely wound loops, he instead works with a cylinder with a surface current that has no z-component. To get the angular component of the B-field...
37. ### Find the potential V(r, φ) inside and outside the cylinder

Not even sure where to start.
38. ### Why is the Electric Field outside this wire not zero?

Not a homework. Just self-studying electromagnetism. I am stuck at understanding the very beginning of the solution steps in this example: The E as given in the solution is the field away from a long straight line with charge Lambda. That's clearly not the current configuration. E should...
39. ### Find the electric field inside and outside of a spherical shell superposition

Hi! I need help with this problem. I tried to solve it by saying that it would be the same as the field of a the spherical shell alone plus the field of a point charge -q at A or B. For the field of the spherical shell I got ##E_1=\frac{q}{a\pi\epsilon_0 R^2}=\frac{\sigma}{\epsilon_0}## and for...
40. ### Induced Current In a Tilted Square Inside and Outside a Solenoid

Plot for the ring ^ Calculations for the Square ^ Plot for square without cosg on the outside calc ^ Plot for square with cosg on the outside calc ^ As can be seen the formulas for the square conductor do not connect at R, which I'm not sure if they should or if they should not as in this...
41. ### Electrical field outside a hollow spherical conductor

Hello everyone, There is an electrical field inside and outside (at the same time) the spherical hollow conductor when we place positive or negative charge inside, isn't it? I know this is because of the induced charges on the inner and outer surfaces of the conductor. There is no field inside...
42. ### Speed of the outside of a wheel faster than the speed of light

I'd like to know if anybody can tell me either; How large a wheel would have to be for the outer edge to travel faster than the speed of light if powered by a motor that's around now. We'll say the wheel is in outer space to eliminate drag and such
43. ### The electric field inside and outside of a dielectric

I bring a dielectric in a region with electric field ##\vec E_0##. Net electric field ## \vec E_{net} = \vec E_0 + \vec E_p ## , where ## \vec E_p ## is electric field due to polarization of dielectric. For linear dielectric, ## \vec E_p ## is 0 outside the dielectric. So, ## \vec E_{net} =...
44. ### Finding out the mass of gas transferred outside of a room

I thought I should use the ideal gas law to find out moles of air that would be transferred out through the window but the temperature and volume outside is not known. Can you help me further? thanks
45. ### B What would happen if we teleport 1mm^3 of neutron star core outside?

Summary: hypothetical experiment, how would neutron core behave in such a circumstance such as, if we teleport 1mm^3 of neutron star core from it outside. how would the 1mm^3 neutrons behave? 1. Would it be stable/no change 2. Would it decay into cosmic radiation 3. would it decay into...
46. ### I Do linear AND dispersive waves exist outside of QM?

Outside of QM, do perfectly linear waves really exist in nature? I am referring to just those waves that also have dispersion - in which the wave components have differing phase velocities. ... or are we just using the mathematics of linear systems to approximate nonlinear systems? Thanks in...
47. ### Calculating the Fraction of Time Particles Spend Outside a Potential Well

I want to compute the fraction of time both particles spend outside the finite potential well. All I can get is the probability to find them outside. The wavefunction outside the potential is: $$\frac{d^2\psi}{dr^2} = -L^2 \psi$$ Where: $$L = \sqrt{\frac{2mE}{\hbar^2}}$$ Solving the...
48. ### Electric field outside a spherical shell?

If a charge is put inside a spherical shell, why is the electric field outside the shell independent of the location of the charge? Gauss's law could find that the net flux is independent, but not each individual field? Is this something about the surface charge density being independent of...
49. ### Pressure Difference Between the Inside and Outside of a Balloon

Hello all. I have a question about gasses and pressure: Is there a way to calculate how strong a material making up a balloon has to be to withstand a given pressure difference between the inside and outside? In other words, if I have a balloon I need to fill to a pressure of 10atm inside vs...
50. ### Voltage around a loop, half inside a capacitor and half outside

Homework Statement This is not a homework problem, I'm working through griffiths Electrodynamics on my own. Homework Equations when there is an emf source, since electrosatic fields integrate to zero around a loop The Attempt at a Solution The solution claims that since the integral of f...