Questions tagged [equilibrium]

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494 questions
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How to calculate equilibria of the sum of “similar” Hamiltonians

Determining equilibria of a Hamiltonian system is equivalent to finding the zeroes of a function, so in general it is a hard task- But what if we have some additional information on the Hamiltonians? ...
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Direction of frictional force on a particle on a plate in circular motion

If we have a particle on the surface of a round plate ,at a distance $r$ from the center, that is rotating with an angular acceleration $k$ , and this particle is in equilibrium with respect to the ...
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Why do we consider the tension in a taut cable to be zero Newtons or Pound Force?

I have been browsing for a few hours now and I can't seem to find a reason for why this assumption is made for calculations and such in engineering problems like statics. It's a little embarrassing to ...
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Why are clockwise and anticlockwise moments not balanced in this equilibrium scenario?

If we take moments about the peg, which is directly below centre of mass of the cone (which is $r$ cm from its circular base) we get $3rTcos(90-ø) = Trcos(90-ø)$. $T$ = tension in string. Clearly this ...
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Thermodynamic equilibrium

I am a bit confused with the description of the thermodynamic equilibrium from my course. By definition the system is in equilibrium if all state parameters are constant in time and there are no flows ...
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Why will a non-black body of a temperature the same as that of the internal walls of a cavity be in thermal equilibrium, if brought into the cavity?

The book of Zemansky and Dittman claims that: I am confused with the first line of the second picture. What is written, actually means that if the temperature of the body is the same as that ...
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Confused by the definition about the inertial frame of reference

In Wikipedia, you can find the definition of the inertial frame of reference, which states: In classical physics and special relativity, an inertial frame of reference (also inertial reference ...
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Equilibrium and centripetal acceleration

Why is there still a non zero centripetal acceleration for a particle at equilibrium in uniform circular motion if equilibrium implies total Force = 0?
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What is the definition of equilibrium?

Assume that two bodies are rotating about their center of mass because of their mutual gravitational attraction between them. Can they be said to be in equilibrium? I believe that the answer is no, ...
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Understanding thermodynamic equilibrium for a relativistic system

The conventional books on thermodynamics that I know, do not talk about the thermodynamics of relativistic systems. But in Cosmology, the thermodynamic concepts are often applied to the whole universe....
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How to identify the equilibrium state and the steady state?

1.Is there any difference between the equilibrium state and steady state? 2.Can I just understand thermal equilibrium and nonequilibrium state just from whether the Hamiltonian of the system is ...
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Torque of the contact forces about the centre of mass

A person leans in the opposite direction when he or she lifts a heavy load in one hand. I read a reason for the same in a book. According to the book, if a body is placed on a horizontal surface, ...
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Could a gas be in thermodynamical equilibrium even with a gravitational field?

Let us consider a cylinder filled with ideal gas, and let us assume that the gravitational field is parallel to one of its sides, well in this case, how would the system be in equilibrium? Suppose ...
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Is it true that an object, in course of its motion, always seeks the position of minimum potential energy?

I have heard the statement, in a Classical mechanics course, that the motion of an object is always toward the position of minimum potential energy. I don't think that this statement correct because I ...
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Reaction forces in pyramid stacking of steel coils

I was tasked with solving this problem at work as we are out of coil holders and we bought 140 coils and need to stack them asap. Companies that make the storage holders are on back order for several ...