# Questions tagged [physics]

Questions on the mathematics required to solve problems in physics. For questions from the field of mathematical physics use (mathematical-physics) tags instead.

3,856 questions
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### Simple equation that will recreate this graph shape?

I am working on an audio synthesis project for a guitar, and one of the most challenging parts has been finding an equation so the decays of the partials (modes) can roughly match the behavior of real ...
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### Understanding Expansion: shorthand in Sandia doc

enter image description here https://www.osti.gov/servlets/purl/10194662 It has been too long since I studied math. 68 years old. Trying to decrypt the math in an old 1994 ballistics study. per ...
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### Is Leibniz integral rule (basic form) allowed in this (physics) improper integral? Why?

Electric potential at a point inside the charge distribution is: $\displaystyle \psi (\mathbf{r})=\lim\limits_{\delta \to 0} \int_{V'-\delta} \dfrac{\rho (\mathbf{r'})}{|\mathbf{r}-\mathbf{r'}|} dV'$ ...
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### magnitude of unknown force on wall bracket question

I'm really stuck with part b of this question, even where to start. I think I keep over complicating it. If anyone could help that'd be amazing!
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### Finding the equilibrium between two beads with equal and opposite forces connected by a spring

Imagine two beads each on parallel rods. The beads are connected to each other by a spring of stiffness $k$. The beads each exert an equal and opposite force $F$ to each other. The distance between ...
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### Determine the forces exerted by the supports on the pipes at contact surfaces. [closed]

The question is: Three smooth homogeneous cylinders A, B, C are stacked in a V shaped through as shown in the figure below. Each cylinder weights 100 and has a diameter 5 cm. Determine the forces ...
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### Solving and making sure

There is a particle in a system.The mass of this particle is M=0.5 kg. The initial and final velocity are V0=2i , Vf=2j (i,j denote the unit vector in x, y axes) Question: 1) The initial and final ...
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### Determine the resultant using triangle method - Analytical Method - Vector Quantity - Physics

I'm having some problems finding the resultant in my physics subject. So heres the given problem: A = 10 meters B = 20 meters 30° The graph looks like this: A is in between Q1 and Q4 in x axis the ...
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### Finding the optimum parameters for volumetric swept 3D display application utilizing planetary gear system

Imagine a planetary gear system as below: There are two curved screens attached to a shaft of the planet (little purple gear). The curves are logarithmic spirals. So they are rotating with the ...
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### Infinitesimal approximations in triangle yielding differing results

I am trying to prove the equations of motion of a pendulum from its energy equation, and I am obtaining different results depending on which infinitesimal approximation I choose. The idea here is to ...
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### The magnitude of the acceleration? The tension in the lightweight cord?

Unfortunately I don't know anything in this question When two objects of unequal mass ( $m_1<m_2$ ) are hung vertically over a frictionaless pulley of negligible mass, the arrangement is called an ...
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### finding velocity of a leaking object in motion

I am having issue with my working for the problem displayed below. Here are my working as follows The questions ask for newtons second law, now as the mass varys with time I use the momentum form ...
2answers
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### Calculating Launch Angle Given Distance with Added Height (which itself depends on launch angle)

In my physics class we have learned to calculate a desired launch angle to allow a projectile to hit a target given the target’s distance away and the initial velocity. Now in this case the initial ...
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### Applying math incorrectly to physics

I have the following argument in physics which I'm pretty sure is wrong: Since all change in location is bounded by the speed of light times elapsed time, we can conclude that any movement is $c$-...
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### The integral over a sufficiently large volume should vanish

I was recently reading an article about organized waves in turbulent flows. At one point in the theoretical part of the study, the author presents the equations for the kinetic energy of the organized ...
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### Derivation from complex simultaneous equations (transmission of a resonator)

I am trying to verify a derivation presented in a journal article, where the authors derive an expression for the transmission of a lossy fiber ring resonator. They start with the equations: ...