Does a straight wire or Electron have a north and south magnetic pole?
So does a wire actually have a magnetic north and south pole? I know a coil of wire will form one but a straight wire will only attract another wire if the other wire's current is going in the opposite...
View ArticleFreezing Salt Water Experiment
I'm in a bit of a time crunch for science fair, and there are still a few questions about my experiment that are unanswered. What I'm dong is trying to accelerate the freezing of salt water by adding...
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What does V(p) graph tell me?
Hello, Well I have all sorts of question, so let me start. In school we had a project where we had to examine, actually predict when the balloon will explode. The following data may not be ideal, but...
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Newton's Rings
See attachment please. After that, please point out, the order of the dark fringes. I mean I can't see where is m=0 dark fringe? Where to start? I want to know so I can know that radius enclosed by...
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Confused about phase lead and lag of a wave.
A sine wave traveling in +x direction can be represented by [itex]\cos(\omega {t}- kx+\phi)[/itex]. As shown in the drawing attached where [itex] \phi=\frac{\pi}{2}[/itex]: a) Is a plot that holds t=0...
View ArticleWhy does Neon gas sometimes glow brilliant white ?
Hello, I was recently pulsing a coil at fairly high voltages (200-600VDC) using DC squarewave, at fairly high frequencies (100Hz - 1.3KHz). The output of the coil had a Neon bulb attached. I wasn't...
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Verify definition of circular polarization in Balanis.
Attached is a scan of how Balanis define plane wave with circular polarization with Ey having a phase of +∏/2 respect to Ex component of the E field. I don't quite agree with the book. The second...
View ArticlePushing a railway car without spinning the wheels?
Hi everyone! I'm struggling to get my head around a calculation having not done any physics studies for 10 years - My brain is a little rusty. Please consider the following scenario: Railway trucks...
View ArticleIs Tidal Energy a "creation" of energy?
I would like to discuss very basic idea about conversion of energy. Every form of energy we utilize (solar energy, wind energy, geothermal, fossil, hydro, etc) can be traced back to the exhaustion of...
View ArticleEllipsometric measurements on a mirror.
Hi, During my internship I worked with an Ellipsometer. Now I'm wondering, what values of Psi and Delta do you get when you measure a mirror under an Ellipsometer? Are there any phaseshifts at all?...
View Articlecouple of questions
1.assume i am riding a motorcycle at 100km/h, but i ride the motorcycle inside a very long train which is moving at also 100km/h. What speed do i have reported to the world? 200km/h? 2.what happens at...
View ArticleEquation for Induction of Electric Current in Magnetic Field
I am looking for something that should be relatively simple to find, but as such, I have not been successful. I know that an electric current can be created by moving through a magnetic field. I have...
View ArticleCentre of Gravity and Centre of Mass
Hey folks, I was doing some moments problems the other day, and I started considering centre of mass and centre of gravity and have gotten myself rather unsure. My textbook defines centre of mass as...
View ArticleAngular momentum vectors and frisbees
While working on shooting mechanisms for the 2013 FIRST Robotics Competition, our mentoring scientist noted that the direction of the angular momentum vector pointed down for our prototype shooter. So...
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How can ellipticity angle be negative.
In plane wave elliptical polarization, the book said if the Ellipticity angle is possitive, it is a Left Hand Circular polarization(LHC). If Ellipticity angle is negative, it is Right Hand Circular...
View ArticleIntegrating Acceleration for Distance
I'm trying to integrate acceleration from an acceleraometer to find a distance travelled. I have heard all the stories about this not being accurate but i didn't come up with the method i'm just trying...
View ArticleConfused about thermodynamic quantities and their minimums.
http://img842.imageshack.us/img842/7200/img0103iu.jpg Mainly concerned with the first half of the page. You'll see that it derives for a system in contact with a constant-temperature, constant-pressure...
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Statics: Bending of a beam/evenly distributed force problem
Hello, and sorry for my English, as I am Norwegian. I have a statics problem which I can not understand. I've taken a pic from my book: The problem asks me to find the largest bending stress, σb, in...
View ArticleQuestion about Inertia
I have a question regarding Inertia. Exactly how much force, in Newtons, is required to overcome the inertia of exactly one kilogram of mass? It seems to me there must be some sort of quantity for it.
View ArticleConceptual thermodynamics question
According to Carnot's theorem η≥η' where η corresponds to a reversible machine and η' is not necessarily reversible, so far so good, the problem is that it is ussually assumed that when η' is...
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