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Found 11 results

1. ## Why is a magnetic field of a permanent magnet not considered energy?

1 law cant create energy. ok but you can give energy to a ferromagnetic and magnetize it. then magnetize as many ferromagnetic material as you want, and not diminish the magnetic field of the 1st one you had. I dont understand how no loss and how that is not considered braking the 1st rule
2. ## Giant Space Javelin

If a giant needle-shaped mass of tungsten carbide (9540km in length, 3567km in width, moving at 99% of light speed) collided with earth, pointy end first, at the north pole, precisely what would happen to the earth, both geologically, meteorologically, and ecologically? Additionally, how would the results differ if the object collided at, say, the south pole, or the peak of the mid-Atlantic ridge?
3. ## Carnot's Theorem

As I was reading through my physics book I came across a proof of Carnot's Theorem. Consider two reversible engines A and B working between same temperatures limits T1 and T2. Source being T1 and sink T2 are coupled. eff1(heat engine) = (Q1-Q2) / Q1 = W / Q1 eff2(refrigerator) = (Q1'-Q2') / Q1' = W / Q1' ( I ) if eff1 > eff2, Q1' > Q1 Also Q1 - Q2 = Q1' - Q2' i.e. Q2' > Q2 Here both Q2' - Q2 and Q1' - Q1 are positive quantity. Which means heat flows from colder body to hotter body with a
4. ## Transport Phenomenon

Hello, I am wondering while finding viscosity of gas why do we consider the rate of transfer of momentum in downward direction to be shear strain ?
5. ## Joule's Expansion And Adiabatic Expansion

I was wondering what causes the difference between adiabatic expansion and Joules expansion? Because to me both seems to same. In a sense that in case joules expansion we open the valve in order to let gas expand on its own. In this case after a while the pressure inside the chamber change, volume change but not the temperature. If I imagine the molecules seems to travel at same speed even if we let the valve open which causes the velocity of the particles to remain same. So I want to know why cant I imagine same thing in case of adiabatic expansion ? Can you please help me understand this
6. ## Why Does The System Pressure Decrease In An Isothermal Expansion?

In a piston cylinder arrangement, the piston can be extended only if the pressure of the gas inside is higher than the atmospheric pressure.In case of isothermal expansion of ideal gas, initially the piston is at rest(gas pressure is equal to the atmospheric pressure) and as energy is given to the system (heat is given to the system) the piston moves.Doesnt this mean the pressure of the gas increases above the outside pressure?(But I have learnt that pressure never increases in an isothermal expansion, it decreases with increase in volume(hyperbolic relation))
7. ## Why Does The System Pressure Decrease In An Isothermal Expansion?

In a piston cylinder arrangement, the piston can be extended only if the pressure of the gas inside is higher than the atmospheric pressure.In case of isothermal expansion of ideal gas, initially the piston is at rest(gas pressure is equal to the atmospheric pressure) and as energy is given to the system (heat is given to the system) the piston moves.Doesnt this mean the pressure of the gas increases above the outside pressure?(But I have learnt that pressure never increases in an isothermal expansion, it decreases with increase in volume(hyperbolic relation))
8. ## What Influences A Matter's Specific Heat?

why do different matter with the same mass require different amount of heat in order to raise it's temperature for 1 degree? what are some influential factors that causes it's difference?
9. ## My Final Theory

I'm going to do a wrap-up now of my theory and what my investigations of cosmology have led me to believe. It's also going to be my last post on cosmology and my ideas. Based on all the current models of significance in the theoretical world, I have came to some final conclusions about the universe at large. 1). To follow the intrinsic rules of spatial symmetries, the universe is part of the full Poincare Group leading to a primordial universal rotation. 2) The rotation naturally leads to an intrinsic torsion field. 3) It also leads to an intrinsic centrifugal force field whic
10. ## Help With Statistical Mechanics

I have been set the following piece of work which I have mostly done, I have worked out the amount of particles hitting the disk but am unsure on how to continue to work out the number of particles hitting the back of the ring, any help would be appreciated, thank you
11. ## Help With Statistical Mechanics

I have been set the following piece of work which I have mostly done, I have worked out the amount of particles hitting the disk but am unsure on how to continue to work out the number of particles hitting the back of the ring, any help would be appreciated, thank you
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