Laminar vs Turbulent Flow
I was hoping someone could give me an explanation as to why resistance of a fluid moving through a tube changes from being determined by viscosity in conditions of laminar flow to being determined by...
View Articleheat specific
The low is: [tex] dQ=dU+p dV[/tex] but the specific heat to volumen (in a perfect gas) cte is: [tex] C_v = \frac{dQ}{dT} = \frac{dU}{dT}[/tex] why if in adiabatic proces [tex] dQ=0[/tex], then [tex]C_v...
View ArticleConservation of angular momentum
I was thinking of a couple basic mechanics problems lately. What if you have a rod sitting in space at rest, and you shoot a bullet at its center. Linear momentum is conserved, and the problem is quite...
View ArticleQuestion of conservation of energy in this thought experiment
Hi, I have a somewhat silly question about something I cannot figure out properly. I have a cylinder with a piston inside. The cylinder is sealed and filled with air. The piston is free to move back...
View Articledoubt in Law of mutual interaction
Book: Classical mechanics (textbook) by Douglas Gregory (cambridge publications) Law of mutual interaction states that when two particle (let it be P1 and P2) interacts, the particle (P1) induces an...
View ArticleWeight to electrical energy.
I am trying to calculate the output of a weight imposed on a electrical generator via a gearbox. Can anyone please help me with this? Let say the weight is 500 000 metric tonnes. How much electricity...
View Articlemomentum of photon
1.photon has no mass . so m=0.hence, p=mv=0.by doing some calculations , we can get that p=h/lambda.we can prove p=mv experimentally.but how can we prove the second one experimentally?
View ArticleInitial-Value Version of Hamilton's Principle?
As far as I understand, Hamilton's principle (a.k.a. "least action" or "stationary action") requires that you know both the initial and final location of a particle. Then, based on the requirement that...
View ArticleFluid flow - pressure v volume?
This a practical problem for the design of a system which uses a water driven hydraulic motor. Assume a 100 gallon tank is filled with water, constantly filled further pressurized by a pump to 500psi...
View ArticlePropagation of static electric field
At what speed does a change in a static electric field propagate through a medium? I understand that through a vacuum it's the speed of light, but through a medium such as a conductor or insulator how...
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How is pressure on an object ?
I would like to know how is the pressure on an object (black on figure). The pressure is not a classical pressure like gas but is given by macroscopic balls. Balls are like magnets, North pole outside...
View ArticleExplanation of Rayleighs work on vibrations of liquid droplets
Hi, I'm trying to calculate the vibrational energy of a water droplet for a given vibrational amplitude. Rayleigh wrote about this in Proc. R. Soc. Lond., volume 29, 1879, "On the Capillary Phenomena...
View ArticleUnderstanding Brewster's Angle
Hi, I'm struggling to conceptually understand why Brewster's angle occurs. I know Fresnel's equations and can see that at some angle, the reflected parallel component goes to zero. What I don't...
View Articlewhat does interaction means?
when we say two masses or charges or particles interacts with each other, we have used the word interacts, what does that mean, does that mean a physical contact or something of that kind?
View ArticleElectric potential energy
hi, please can anyone analyze the following sentence in terms of the formulas of electrostatic forces or Potential energy (assuming electrostatic force is directly proportional to potential energy)...
View ArticleUnit Normal Vector in Acceleration
What is the Unit Normal Vector in Acceleration.[tex]\vec{u}_n[/tex] How would I go about calculating the normal. Wiki and Wolfram Alpha were very vague about calculating the normal of an orbit. I would...
View ArticleStatic friction in body with no intention to move
Suppose a block of mass 5 kg is resting on a horizontal surface and coefficient of static friction between block and surface is 0.2. If the block is pushed against a vertical wall with a force of 200...
View ArticlePSI Calculations
Suppose you have a hollow cube with a volume of 504c3. The inside of the cube has a psi of 94 and is just air. Now suppose that a hole opened in the bottom of this cube with an area of 12.56cm2 that...
View ArticlePutting it all together (calc and physics)
Ello all. Ok so im excited. i am taking my first ever physics class, calc based. SO im trying to relate things from calc to physics because i am some what confused. In calc we learned that if you have...
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Bullet drop relative to line of sight
I'm kind of confused by this: Suppose a rifle is zeroed in at 800 meters (the bullet hits the line of sight at 800m). This means the bullet must be fired at an upwards angle, the scope stays pointing...
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