What is Outside: Definition and 469 Discussions

I'm confused on what this even looks like let alone trying to solve it. A ball of charge -50e lies at the center of a hollow spherical metal shell that has a net charge of -100e. What is the charge on (a) the hsell's inner surface and (b) its outer surface? The answers are: (a) +50e; (b)...

light in the event horizon does not come out, right. If this is due to gravity will light on the edge of the event horizon, butnot in it, be bent, so that when we look at the light beside a black hole, it is not coming from the behind the black hole, but from an angel. ___________s...

I can`t seem to find any information on how to calculate the magnetic field outside a real finite solenoid. I do not need the field on-axis, but rather perpendicular to the solenoid. Any ideas on how to proceed, or suggestions to literature? Thanks Indian

I realize this topic has probably been beaten to death on here but I've never had the fortune of coming across it so I made my own. Now, if you believe the whole Big Bang theory, the universe is exanding. In order for anything to expand, there must be something for it to expand into. Now, if...

We've got two concentric metallic spheres, let's say P and Q P is the smallest one, so its inside Q Q is grounded and P is positive charged I figured out that the field in between P and Q is not homogeneous but constant. But why is the field outside Q zero while it is not inside Q...

I am trying to set up an experiement to measure period doubling in a leaky tap. My plan was to just have a speaker input to a computer (through the com port I assume) to register drips into some container. My web searchs for how to wire the two wires from a speaker to any port on the...

Look woman, we aren't stupid. We didn't vote 9/11. We didn't vote Bush to stop gays from Marrying. I am so sick of people who do not understand the American political landscape, and who are obviously EXTREMELY confined in their thoughts, trying to come up with one reason on why Bush won. If it...

Consider a light source approaching a singularity (in free fall). As the source approaches the singularity, it is approaching infinite gravity, infinite tidal forces, infinite time-slowing, infinite escape velocity, and infinite red-shifting in zero distance (as seen, or not seen, by outside...

Escape velocity at particular radius from the gravitational source means the initial speed that an object needs at that raduis in order to coast without limit ("to infinity") without ever falling back to the gravitational source. If the escape velocity at a radius is so large that nothing...

Everything in the universe is inside of spacetime. But in order to fully understand the universe, the vantage point must be outside of spacetime. This point of view is impossible to reach. For the quantum universe of the elementary particles, an "inside" exists for all particles. This "inside"...

I have read that the Dark-Energy may be a consequence of Pressure from outside of the Universe. The presence of a spin zero field (higgs-field) seems to make this idea really interesting. Negative pressure was postulated by Poincaire, Dirac. Accordingt to the author, negative...

Hi I have scoured the internet trying to find the right expression to calculate the magnetic field (B) outside of an AC driven solenoid. All i keep getting is stuff for DC driven or inside the solenoid. Can anyone help? thanks Craig

Does anyone have an intuitive explanation why the gravitational force of a sphere on a distant point is the same as if all the sphere's mass were concentrated at the center? The usual integration over spherical shells goes through o.k. but the result is so simple it seems to me that maybe we...

A hollow spherical shell is uniformly charged with a total charge Q. Show that the electric field outside the shell is everywhere the same as the field due to a point charge Q located at the center of the shell.

A point charge Q is at the center of a conducting spherical shell of radius R. The total charge of the shell is -Q. (a) What is the field in the region between the point charge and the shell? (b)What is the field outside the shell? I think I got part (a): F = \frac{kq_1 q_2}{r^2} =...

A square has 360 degrees, if you measure the degrees on the outside, what degree do you get?

Matter can only exist in space-time, so outside space there is nothing, but snce space-time is in "nothing" would our existence be a paradox?

I know that there are devices which shift or replace wavelengths of light that are out of the visible spectrum so that we can see them. What would be the result of having a device which can sense artificial light bypass the restrictions of our eyes and send impulses directly to our brain. If our...

i read in the paper today that bush is worth something like 10 million dollars. and this is made up mostly of stocks and other investments. how can we trust him to do what's right for the country, and not what helps out his investments?