# Questions tagged [integration]

For questions about problems related to physics that involve evaluating integrals. Purely mathematical questions should be asked at math.SE.

1,412 questions
Filter by
Sorted by
Tagged with
52 views

### Mapping monoenergetic dose rates to a dose rate from a spectrum of neutron energies [closed]

I have the following function N(E) = B Sinh(sqrt(2E)) e^(-0.88E) which represents the release of fission neutrons over different energies. I have calculated dose rates for different monoenergetic ...
25 views

• 151
1 vote
51 views

### Integral of Theta function [closed]

I'm trying to compute the following integral, useful to calculate Amplitudes in String theory \int \frac{d^2z}{\tau_2} \;\partial^2_z \log \vartheta_1\left(z\right) = - \frac{\pi}{\...
• 11
37 views

### Residue theorem application

First I want to provide a little bit of context: I finished my undergrad degree in physics in 2008 and after that I moved into strategic consulting and into the financial world. Right now, at 41 years ...
93 views

### Hooke's law and derivation of work done by spring confusion

For simplicity I'll do this in 1 direction so I can let the sign dictate direction and ditch the vector notation. The force done by a spring can be written as $$F = -k\Delta x ,$$however this ...
34 views

### How to know the position of an object when calculating the center of mass, without using integrals? [closed]

For example, if I have a 1/4 piece of pizza, what is the position?
In Tong's lecture notes (http://www.damtp.cam.ac.uk/user/tong/qft.html) page 38, he calculates the following propagator: $$D(x-y) = \int \frac{d^3 p}{(2\pi)^3} \frac{1}{2E_\vec{p}} e^{-ip \cdot (x-y)}.... • 665 1 vote 1 answer 40 views ### Electric field at a point created by a charged object (derivation/integration process) I was hoping someone can help me understand the math behind the electric field (electrostatics). I have gaps in my knowledge about integrals and derivatives (university moves very quickly and it has ... • 19 0 votes 0 answers 13 views ### Movement of a mass on a spring in damped SHM Suppose a ball is connected to a spring attached to a wall, and they are in space, i.e. assume no gravity. The ball is put into a fluid with Stoke's drag and oscillates backwards and forwards relative ... • 605 2 votes 1 answer 66 views ### Integral Quantity Interpretation Is there any natural interpretation for the following quantity?$$\int_{\vec{r}(t)} \nabla(\vec{v} \cdot \vec{A})dt \ .$$Where:$$\vec{v} = \frac{d \vec{r}(t)}{dt} \ , is the velocity of the path ...
I can understand the Differential form of Gauss's Law ∇⋅𝐄= $\frac{ρ}{ɛ_0}$ as saying that the source of electric field vectors or flow disperse(The divergence of the electric field) is equal to the ...