Capacitance of loops
Hi, Does anybody know a nice formula for the capacitance of two metallic wire loops with equal radius R? (The center of the loops are above each other, their distance is d. The whole system is in...
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Horizontal Velocity in Monkey-Dart Problem
In the Monkey-Dart experiment (where a monkey lets go of a vine exactly the same time a dart is shot at him), the dart is known to reach the monkey because the distance from the vine to where he ends...
View ArticleExistance of particles in potential extrema
First time poster so I apologize any problems with location or content. By the way, you guys are awesome. Just some context: last semester I had a theoretical mechanics class and the teacher said,...
View ArticleQuestions about electrostatic charge
Can one transmit electrons to create an electrostatic charge through electrostatic induction? Can one use a gas to create an electrostatic charge in an item by moving the air next to it? If either of...
View ArticleHow can evaporation occur?
Since heat is transferred from a region of high temperature to low temperature if a few molecules have more energy, it would be transferred to the surrounding molecules. So if a molecule has 10J of...
View ArticleConvertion of angular momentum to linear momentum
Suppose a rod is rotating about its center of mass, for simplicity consider it to be its geometric center(uniform density). At an instant a rigid ball is introduced near the rod so that it collides...
View Articleotto cycle and Carnot efficiency
Dear all, how to prove that when the fuel injected per cycle decreases, the efficiency of the cycle approaches the Carnot efficiency. Regards,
View ArticleElectrostatic charges in ionic compounds
From this link: http://www.chemguide.co.uk/atoms/str...nicstruct.html it explains why NaCl has a 6:6 coordinated structure and not an 8:8 coordinated structure. However, i don't really understand their...
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Rotational Equilibrium and Normal Forces
Hi, The question I have is not for a numerical answer but for clarification. Attachment 55386 Some of the questions involving torque/rotational equilibrium describe a person standing on a plank. I know...
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Pendulum Potential energy equation
hello every one i have this pendulum: i need to stabilize the pendulum in the inverted position , i need to know the potential energy for the pendulum , i read several articles in each one i have a...
View ArticleInternal repulsion in metals
When metals are polarized, one end will be positive and the other end negative. So why won't the metal stretch out in the 2 ends? Like in this image: http://postimage.org/image/lb179qpo7/
View ArticleHow exactly do you find the net force between charges?
I was doing some homework problems, and I came across a couple I didn't know. I then realized I must have screwed up my understanding on electrical forces. For an electrical force, if there are two...
View ArticleDeriving Moment of Inetia using just linear dynamics
Can moment of inertia be derived using just linear dynamics and calculus. Textbooks usually derive moment of inertia using energy equation and and analogy of 1/2mr^2w^2 with 1/2mv^2. I would like to...
View ArticleHarmonic oscillation with friction
Hello, I want to include kinetic friction into the harmonic oscillator. A small blocks is attached to a horiontal spring on a table. Because there is kinetic friction there are two forces on the blok...
View ArticleEnergy vs Stability
I'm having trouble understanding the relationship between a system's energy level and its stability (in a general sense). My understanding is that chemical and physical systems experience a driving...
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Free Body Diagram for a Kite
The wind is blowing with a force of 48 N against a kite that Taylor is flying, so that the tail of the kite makes an angle of 24° to the ground. I am just really confused on this, I attacted the...
View ArticleGibbs free energy and melting
Hi, As I understand, during the process of phase change from a liquid to solid (or any phase change for that matter,) the temperature of the substance remains constant as the energy being applied to...
View ArticlePhase relation between current and electromagnetic field generated
Dear Forumers I am having a bit problem understanding the phase relation between current source and the generated eletromagnetic field components. Assume a very small current element( a very small...
View ArticleBlackbody and absorption problem
Well, this question may seem elementary to you but I simply do not have a background for it. Now the question: Sun radiation resembles a blackbody at over 5000°K. A solar cell's temperature is around...
View ArticleDetails on Voltage
Hi all, I just completed my first circuits course (which I did decent in). One thing that has always been bothering me is my understanding of voltage. If you have a general understanding of even the...
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