Hemisphere Definition and 160 Threads

There is a hemisphere of radius R and surface charge density \sigma. Find the electric potential and the magnitude of the electric field at the center of the hemisphere. I started by saying V = \int dV = \int \frac{\sigma dA}{4\pi \epsilon_0 R}. This, at least, I am confident is correct...

Charge is distributed uniformly on the surface of a hemisphere. Find the electrical field at the center of the sphere due to that. Can anyone help me?pls ^___^

I recently read an article that stated that the Arctic ice cap is melting at a geologically rapid rate and that the air temperature over the North Pole is doing the same. The link is below: http://www.msnbc.msn.com/id/9527485/ I was wondering if any data have been collected regarding CO2...

I need to find the force on a hemisphere below a certain height H in water. The hemisphere is resting at the bottom. The radius of the hsphere is r. I think i need to use dF = dPdA and use spherical coordinates to integrate but do not know how to form the triple integral required!

How to find centre of gravity for a hemisphere shell?? Can someone show me how to calculate centre of gravity for a hemisphere shell??

I'm sure this has been discussed too many times, but it still seems to be controversial. So, if anyone south of the equator is reading this, please let some water go down the drain (a sink or bathtub, not a toilet) & tell us if it swirls clockwise or counterclockwise.

Consider a nonconducting hemisphere of inner radius R, that has a uniform charge distribution of magnitude Q on its interior surface. Find the magnitude of the electric field at C (the centre of curvature of the hemisphere). we haven't learned GauB's law yet. That is the next chapter. What...

Does anyone know which hemisphere has more land mass? My guess is the Northern Hemisphere, and if that is fact, why is it so?

I live in the northern hemisphere about 38 degrees latitude. Last week I noticed that the plane of the ecliptic defined by venus Mars and Jupiter (or was it saturn?) was nearly over head at the zenith. I don't remember seeing this in my past looks at the sky. Is this a once a year thing like...

A right circular cone is inscribed in a hemisphere. The figure is expanding in such a way that the combinded surface area of the hemisphere and its base is increasing at a constant rate of 18 in^2 per second. At what rate is the volume of the cone changing when the radius of the common base is 4 in?