New answers tagged definition
3
votes
Why is Kinetic energy not an explicit function of acceleration?
His main question was that acceleration is also a property of a moving body so why is Kinetic energy which keeps track of energy associated with motion doesn't include the acceleration explicitly?
...
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5
votes
Why is Kinetic energy not an explicit function of acceleration?
This is just another "why is this thing not the definition I think it is?" question. The thing we define to be kinetic energy is a function of speed. If you want to get to the heart of the ...
- 58.6k
3
votes
Why is Kinetic energy not an explicit function of acceleration?
Most high school students have seen the kinematic equations. Specifically
$$v^2 = v_0^2 + 2ad$$
This is the explicit equation that shows $\Delta v^2$ is directly proportional to acceleration.
If you ...
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4
votes
Why is Kinetic energy not an explicit function of acceleration?
Kinetic energy is not a generic property of a moving body. It is a property defined in such a way as to satisfy some essential relations directly originating from Newtonian Mechanics.
In particular, ...
3
votes
Why is Kinetic energy not an explicit function of acceleration?
There is one assumption made in the way he framed the question:
His main question was that acceleration is also a property of a moving body so why is Kinetic energy which keeps track of energy ...
- 3,313
2
votes
Why is Kinetic energy not an explicit function of acceleration?
A change in kinetic energy depends on acceleration and is independent of the choice of relatively inertial reference frames.
On the other hand, kinetic energy itself, which is a function of velocity, ...
- 77.9k
3
votes
Accepted
What is resistance precisely?
Is there a mathematical definition for resistance ?
Here is an experimental definition of resistance. We can measure the current $I$ that flows through any object or device when we create a range of ...
- 60.5k
2
votes
Does every object in space have a weight (disregarding negligible external forces)?
Mass is the amount of stuff in an object. An object always has mass.
Weight is the gravitational force a nearby planet exerts on an object. The object has weight only if there is a planet nearby. (Not ...
- 45.7k
1
vote
Does every object in space have a weight (disregarding negligible external forces)?
This question is really mixed up. Is it about "weight" or is it about gravitational self interaction?
If it is about weight, then it is meaningless, but the fact that it is so is an ...
- 39.6k
0
votes
Is pressure only define at the surface in contact?
If the container is rigid, then hydrostatic pressures on the container due to the fluid outside the container (A,B,C) are independent of the hydrostatic pressure of the fluid within the container (D).
...
- 77.9k
0
votes
Accepted
Is pressure only define at the surface in contact?
The definition that you quote from the top of the Wikipedia article applies to pressure on a surface, but further down in the article there is another definition:
Fluid pressure is ... the ...
- 60.5k
3
votes
Definition of conjugation of complex Grassmannian numbers
The mistake in your calculation is to assume that the product of two real Grassmann numbers is still real. This is not true due to to 9.65. Consider two real Grassmann numbers:
$$
\theta^* = \theta\...
- 15.1k
3
votes
Work force displacement vector doubt
Multiplication is commutative so $Fx\cos\theta=x\cos\theta F$. Additionally, cosine is a symmetric function so if you measure the angle to be the opposite magnitude (i.e., with a minus sign), the ...
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1
vote
What is a *Poisson Solid*?
Small linear stresses and strains in a homogeneous isotropic 3-dimensional material are classically related by an elasticity tensor with only 2 independent parameters, e.g. the shear modulus $\mu$ and ...
- 13.2k
0
votes
Accepted
How are $t$ and $u$ channel processses different?
Well, you are right in that the two diagrams you show for the Compton scattering are indeed equivalent. However, these are neither t- nor u-channel diagrams; the diagrams you show are s-channel ...
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1
vote
How are $t$ and $u$ channel processses different?
The dependence of the processes on the moemnta are entirely different, being roughly
$$
\frac{1}{(p_2-p_4)^2 -m^2}
$$
for the first and
$$
\frac{1}{(p_2-p_3)^2 -m^2}
$$
for the second.
- 56.5k
2
votes
Entropy in a thermally isolated system
In page 141 of the book "concepts of thermal" it is said that for a
thermally isolated, the change in entropy is bigger or equal to 0
since $dQ=0$.
There's only two ways that the entropy of ...
- 77.9k
1
vote
WKB method as a Semiclassical Approach
What is precisely mean in quantum mechanical context to be "semiclassical"? Wikipedia states that generally semiclassical methods just mean that one part of system is described classically, ...
- 65.1k
1
vote
How one uses the definition of observers in General Relativity?
You're not considering whether the reference frame is inertial or non-inertial. An inertial reference frame is one in which the entire coordinate system under consideration is traveling at a constant ...
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1
vote
Derivative for the Maxwell field
$$\frac{\partial(\partial_{\mu}A^{\sigma})}{\partial(\partial^{\nu}A_{\lambda})}$$
I can't understand whether I must raise the lower index of the partial derivative, and lower the one of the vector ...
- 23.3k
1
vote
What is symmetry in the context of physics?
I am not sure entirely what you are asking but at first glance it looks like you are asking how physics approaches local versus global symmetries to which there are already answers to that question.
...
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3
votes
The definition of the Lie Derivative
It's just because you want to compare two objects at the same point. In differential geometry you can NOT compare objects at different points since they live in different spaces. The pull back allows ...
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0
votes
What is capacitance, in general?
I really like not to overanalyse things.C=dQ/dV.It simply means that if we have have a capacitor of 1F and we put it under a voltage source of 1V the charge stored on the plates of the capacitor will ...
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