Ohms law implies specific condition for the charge density
We have all seen Ohms law, J=σE. This approximations makes sense in simple electric fields in which the charges are accelerated in parallel. However as I will demonstrate, this implies a few conditions...
View Articlefinding the "energy balance" of a hydroelectric power generator
I proposed a new hydroelectric energy idea to somebody and they asked me for a "energy balance". I know nothing about physics or anything relevant to calculating something like this. If somebody asked...
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Mechanics question on vector statics
Determine the reactions at B and D when b = 60mm ? (Diagram is attached) Since B and D are hinged we don't know the direction as well as magnitude of the reaction forces at B and D. Hence we have 4...
View ArticlePulling information out of a black hole
Can somebody help me out here. The gravity of a black hole is so strong that nothing can escape it, not even light. If that's the case, why cant another black hole of larger mass be used to extract...
View ArticleGravitational force on objects
If I take a feather and a rock and drop them at the same time, because of the effect of the gravitational force, we know that the rock will hit the ground first. (The rock experiences a larger...
View ArticleViruat Displacement??????
What is Virtual Displacement in D'Alembert principle???????????Please explain with a good example..........:eek:
View ArticleNeed help finding downloadable electro-nuclear simulators for Mac OSX
Hello. I would like help finding downloadable magnetism simulator applications for my Mac, which runs OSX Lion with 10X GPU Mac Pro, so i won't have to worry about system requirements. I really don't...
View ArticleA Charged metal Sphere [does charge move around]
For a charged metal sphere of charge "+q" is the following statement true ? all the excess charge is in static equilibrium The statement basically implies that the excess charge on the surface can't...
View ArticlePressure of liquid given radius, help please!
A test tube filled with water is being spun around in an ultracentrifuge with angular velocity. The test tube is lying along a radius and the free surface of the water is at radius r(o). Show that the...
View Articlehelp finding potential energy of submerged buoyant object
object is the shape of a ball 300 feet in diameter. (~100m) object weighs 100,000 lbs (~50,000 kg) object is at a depth of 1000 feet (~300m) I just need a rough estimate - you can use meters or feet or...
View ArticlePositive charge distribution in a conductor
Hi experts, I still do not understand how positive charge is distributed inside a conductor. In case of extra electrons is it quite evident, as they are free to move and repel each other, so they go as...
View Articlenewtons 2nd law for rotating bodies
Is shown like this in my book: Consider a rotating body with an angular acceleration α. There must be a tangential force component if it is rotating: For a general point on the body we can write: Ftan...
View ArticleSpecific Heat: Bond or Freedom of Degree Based, Or Size??
Okay so Ive been trying to understand what causes one substance to have a higher specific heat then other but Ive read quite a few conflicting sources in which one says its due to the freedom of...
View ArticleFishing
I am trying to figure out how much force i need to pull to drag an object with a given surface 1634 square inch and weight from a given depth. Between 100 - 200 m 11-21kg psi. However I do not know how...
View ArticleDifference between heat and temperature
I know there is a difference between heat and temperature as once I was told what it is. I remember it being very subtle and that's probably why I cannot remember the details anymore. Would anybody be...
View ArticlePractical Fluid Mechanics
Suppose I have say a 40' long 3/4" garden hose stretched out linearly on a level surface. One end is attached to a faucet with maybe 30 psi. At 10', 20', 30', and 40' there are small vertical pipes...
View Articlerechargeable batteries help
Hello! this is my first post here,hope it's the good part of the forum. I have some questions and i would appreciate it very much if someone more knowledgeable than me could help me out. A while ago I...
View ArticlePrinciples behind how Waveguides work.
So I am studying about waveguides and I am going through all this mathematics and then I realized that I do not understand the general concept of how wave guides even work. I can go through the math...
View ArticlePotentials from Equation for the Field - Independent Variables? I'm Lacking...
Hey guys and gals, this isn't actually an assignment of any sort, so I didn't want to put it in the homework section. This is also my first post, though I have been lurking for quite a while, reading...
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