# Questions tagged [equilibrium]

Equilibrium is the condition of a system in which all competing influences are balanced. These can range from forces (static/dynamic equilibrium), to chemical processes (chemical equilibrium) and temperature gradients (thermal equilibrium).

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### Help solving this mechanics problem [closed]

Between a push cart and a pull cart, which requires the greater "effort"? For consistency, both weighs 500 N, has a handle bar inclined 30° above the horizontal and a coefficient of sliding ...
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### What is the minimum value of $\mu_s$ that will allow rod $AB$ to remain in place? The rod has length 3.3m and it has weight of 200N [closed]

First, I have properly drawn the Free Body Diagram (attached below) and mentioned all forces. Since the system is in equilibrium, the sum of all vertical and horizontal forces will be zero. This ...
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### Empirical equivalence of shifted chemical potential $\mu_i$

It is often said that, in classical thermodynamics, entropy $S$ and energy $U$ are defined only up to an additive constant proportional to the total amount of substance $N=\sum_i N_i$ (where the sum ...
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### Vapour mass to remove from tank in VLE to reduce a certain amount of pressure [closed]

I have a tanktrailer and a tank containing a cryogenic VL-mixture of methane. I would like to calculate how much kg of Boil-Off gas I would need to take out from the tank to the trailer in order to ...
1 vote
65 views

### Weight distribution and support polygon

I was working on a problem of supporting an object with sticks and wondering about some use cases that would fail. My approach is to place the n-sticks (for example 4) under an object with mass m ...
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### What happens to entropy and energy when you inject heat into 2 systems in thermal equilibrium?

Below we have a system A and B in thermal equilibrium. What happens to the entropy and energy of the systems when you inject heat into system A and let it equilibriate further? I know that heat will ...
1 vote
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### Is the pressure zero in thermal equilibrium? [duplicate]

In a canonical ensemble, we have $dU=TdS-pdV$. When we are in equilibrium, the energy $U$ is minimized. This implies that $\left(\frac{dU}{dV}\right)_S=0$. Since $\left(\frac{dU}{dV}\right)_S=-p$, we ...
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### Thermal equilibrium, heat and temperature [duplicate]

I am just studying thermodynamics for the first time and confused between these three terms Temperature is defined in terms of thermal equilibrium (from zeroth law of thermodynamics) and thermal ...
1 vote
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### Total temperature when combining two systems of unequal temperature [closed]

I know that intensive properties a characterised by the fact that when you combine two systems (A and B) that have the same value of an intensive property (for example same Temperature) the combined ...
1 vote
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### Comparison of time to thermal equilibrium

I suddenly got curious in real life. The refrigerator stops working when it reaches a set temperature. If a hot object enters the refrigerator, the temperature of the refrigerator will rise and it ...
1 vote
54 views

### How much force is each leg supporting? [closed]

Assuming that the plank rotate in the red dot and it weights 10kg, how can we calculate the weight or force each leg is supporting? I tried the following system, assuming the left most leg is ...
132 views

### An axiomatic approach to thermodynamics

I have been working on an axiomatic approach to thermodynamics, and tried to follow the footsteps of Theodoro Frankel using his little book, The Geometry of Physics. The passage appears before ...
1 vote
An isothermal process is one in which temperature of the gas is constant throughout the process. From my physics textbook: the state of a gas is described by specifying its pressure $p$, volume $V$ ...