Recent content by d4rr3n

So the current flowing through the wire of an electromagnet generates no electric field?

Why is it that a static electric field will exert a force on a stationary charged particle but a magnetic field from a permanent magnet will not? I am somewhat confused by this because the magnetic field in a permanent magnet is the result of spin charge polarisation which must generate closed...

The Earth has a net negative charge whilst the Ionosphere has a net positive charge, this has been known for well over a hundred years now. My question is about the negative charge of the Earth, are the free electrons on the Earth's surface stationary? are they whizzing around in the Earth in...

Thanks, I have read elsewhere that a magnetic field has no effect on a stationary charged particle i.e. it does not cause a stationary charge to move or to aline to the magnetic field in any way.

An electron beam can be curved into a loop using a magnetic field with flux lines at right angles to the electron beam. These electrons have a high kinetic energy leaving the electron gun. My question is how would a magnetic field effect motionless charged particles for example a cloud of...

In a Newtons cradle when one ball strikes one end only the last moves forward, the force is merely transmitted through the others...but you are saying they will all move forward? In the example you gave I would expect 4 to strike 2 and 1 to rapidly accelerate away from 2, I would expect 2 to...

If the large ball was lifted and released would not its kinetic energy be transmitted through the decreasing size balls causing the last to accelerate away from the others with a grater velocity then the large ball that initiated the process?

In a Newtons cradle the ball at one end of the ball train moves with similar velocity to the other minus the gradual slowing due to loss of energy in both. What would be the result if I made a Newtons cradle in which the size/mass of the balls gradually decrease? My instinct tells me that the...

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True Cause of Whip's Crack Uncovered http://www.scientificamerican.com/article/true-cause-of-whips-crack/ In the above they are saying it is not the tip that brakes the speed of sound but it is the loop traveling down the whip which is accelerating until it exceeds the speed of sound. "The...

I have found that you can easily crack a leather cord with no tapering, therefore the belief that the phenomenon is due to the mass variance along the length of the whip is incorrect.

I have been watching slow motion videos of whips cracking and the tip makes a loop traveling at speeds above that of sound. I was thinking it might be due to centripetal acceleration. The radius of the loop decreases as it travels down the whip.

I'm trying to understand by what mechanism a whip can multiply the velocity of the initial arm motion until it reaches the speed of sound, how is it doing this?

Use a fire piston and a falling weight to depress the piston.

I allowed unlimited speed so that nobody could say we can't spin it fast enough or there is no motor that could do that ;) What would happen to the bar as its angular velocity approached the speed of light for example, I'm sure the effect of spin would result in a different phenomena then an...