Recent content by Jacobim

Yes there are at the bottom of the page: http://www.nature.com/srep/2014/140422/srep04741/full/srep04741.html#supplementary-information It just appears as the force between a the water resisting a bubble being created in the tube and the force pulling the water down balance to allow a large...

Ah, ok. All that information was hidden behind a little circle symbol that said "5 amps" (or maybe I didn't read my textbook thoroughly).

What about the danger of wet hands on a car battery? That was my original question to the person I am discussing it with. Wikipedia suggests wet skin could reduce resistance to 1000 ohms. That gives 12 mA across whatever path the current takes, and that seems dangerous to me. He maintains that...

Ok thanks. One thing I found confusing is in circuits class, there would be circuit examples with a constant current source instead of a constant voltage source. So that had me confused about what is the driving force in a circuit.

It is said that with dry hands, you can touch the poles of a car battery and it will not shock you. I understand this is because dry hands have a very high resistance. Now if you have wet hands, or even worse if you have needles stuck into your skin that are attached to the battery posts, this...

Hello, I am calculating the centroid of an area using this equation for composite bodies: sum(indivudual area times individual centroid)/sum(individual area) = distance from axis to centroid this is just y bar for a cross section that is symmetrical about the y axis I was under the...

Could it be said that the eye is a radio reciever?

What is the distinction between EM waves and Sound waves. I know that sound is cyclical vibrations in some sort of medium. When the frequency increases, do these vibrations become EM waves? I know that EM waves do not need a physical medium. But they are still energy, and sound is energy. So...

but the d squared is not an exponent, its a derivative...are they the same?

yes, I see that now. Does the d^2 mean something? or just signifiy second derivative, i can see how the dx squared would be like acceleration is seconds^-2

is there an algebraic meaning to expressing the derivative of a function as (d^2)y/(dx)^2 in the liebniz way

Thanks Jbriggs and everyone else. I just have these concepts and I get them confused, but actually they are simple concepts, so the trick is to not get them confused.

A Newton is: ( (one kilogram times one meter) per second) per second) I am trying to get at the basic logic of how we can apply numbers to reality. I have a good understanding of how we use a ratio to express things. A ratio separates one quantity into the amount of another quantity. In fact...

Thank you for all the replies. I will have to study this information to understand it.

There is no position vector in the definition of magnetic flux. It is just the integral of B dot dA