Recent content by StephenDoty

My professor wrote ln(P)=(-Hvap/R)*(1/T) on my paper then I just solved for T. Is this is not the correct formula to find the normal boiling point? What is? Oh, and does my Hvap look ok? Thanks for all of the help. I appreciate it. Stephen

if both pressures are the same then ln(P2/P1) in the formula ln(P2/P1)=(-Hvap/R)*((1/T2)-(1/T1)) would be zero and when finding the temperature T=(-hvap/R)*(1/ln(P)) ln(P) would equal ln(1) thus there would be a zero in the denominator. So how would that work? Thanks for the help. Stephen

Hello all I performed a lab where we put a graduated cylinder filled to 90% with water upside down in a large beaker filled with water and measured the volume of the air bubble inside the graduated cylinder at different temperatures. When I graphed Ln(PH20) vs. 1/T I got a slope of -10412...

I am trying to make a stator ring like the ones described in: http://www.tpub.com/neets/book5/18a.htm http://www.geocities.com/vijayakumar777/inductionmotor/inductionmotor.html http://www.mpoweruk.com/motorsac.htm How many windings per inward notch do I need to make from the wire to make a...

Hello everyone. I am currently studying the periodic trends in my chemistry I class. So I just want to make sure I understand the concepts. Z effective= Atomic # - # of core electrons. Z increases across a row and doesn't really change going down a group. Size, radius, of atoms the...

Hello all I would like to create a toroid with 3 phase windings connected to a three phase switch connected to 220V or 110V.The windings are wound in such a way that one type of coil is wound around the toroid at a specific location and around the toroid diagonally from the first position of...

great! thanks. but is Delta Hvap= 3.18 * 10^4 J/mol right??

Z^2/nhigh^2 - nlow^2 is the same thing as z^2*(1/nhigh^2 - 1/nlow^2)

E of nlow to nhigh= -2.178*10^-18 * Z^2/nhigh^2 - nlow^2 find the energy needed to remove an electron completely from a hydrogen atom and the energy needed to remove one mol of electrons from one mol of hydrogen atoms Z= 1 nhigh= infinity nlow=1 E = 2.178*10^-18 J one mole of electrons...

Hello all I completed a lab last week where we filled a graduated cylinder up 90% of the way with water and inverted it into a water bath and then we heated the bath to 80 degrees Celsius then measured the volume of the air bubble as it cooled to 50 degrees Celsius and at 1 degree Celsius...

I did that. But a solenoid does not have an external magnetic field. Any ideas of how to make a toroid with an external magnetic field?

I know it can be done because in my other thread on CR4 forum emc_c said to leave space in between the coils. This worked to a certain extent. The field was not strong at all. I am now wondering if criss-crossing two wires to make a criss-cross coil and connecting them together or if wrapping it...

I basically want a toroid with an external magnetic field. Would rapping the ring with a few loops of magnetic tape and then coil the toroid with a magnetic wire and use a dc power source create a toroid with an external magnetic field?

The circular magnets that you can buy at places like Radio Shack and ACE. It is just a simple magnet that is circular in shape. And it is 3-d so the circular magnet becomes a cylindrical magnet. Its the same thing.

Hello everyone I am trying to create a ring shaped magnet. If you coil wire around a toroidal core the magnetic field is only inside the toroid I want the magnetic field to be present around the outside and inside the hole of the toroid, the ring shaped magnet? I basically want the magnetic...