Mathematics Stack Exchange
Mathematics Stack Exchange

Questions tagged [physics]

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

This tag is for questions on the mathematics required to solve problems in physics and should not be confused with those on physics concepts. Pure physics questions should go in the Physics Stack Exchange. For questions in the field of mathematical physics, please use the tag instead.

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Hamiltonian, Unitary and Matrices Exponential

Suppose I can write my Hamiltonian as above. $J_x, J_y, J_z$ and $Q$, etc. are operators. It is obvious that I can add the terms as I want: I can add $J_x + J_y + J_z + ...$ or $J_y + J_x + J_z ...$ or etc. From my Hamiltonian, I can get a unitary…
user21091084
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Lagrange function of a material point

I'm reading volume n. 1 of "Course of Theoretical Physics" by Landau, Scope: Lagrange function of a material point in free motion, in an inertial system. What: two inertial systems, K ad K', the second moving with velocity $ v' = v + \epsilon $. We…
dattiluca
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Optical mirror for cylindrical to planar reflection

I was thinking of converting a disused chimney into a static periscope, using long focal length lenses at top end of the chimney. A static design would be easier, so I was wondering how one would design the mirror shape such that it converted a…
Konchog
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Simple physics problem: What is the mass of an object?

An object is thrown straight upward with an initial velocity of 1217 pixels per second. The vertical velocity of the object after 2 seconds is 0 due to gravity and the object is 1188 pixels above its starting point. The acceleration on the object…
Joncom
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Van der Waals interaction of an atom with a semi-infinite crystal surface spherical coordinates

Interaction of an atom with another atom that is distance $r$ away from it is given by $$ V=-\frac{C}{r^6}. $$ If you first use polar coordinates for the total interaction with a an infinite plane that is placed distance $h$ away from it you get for…
user34909
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How much force would someone falling with a rope experience?

I was trying to figure out how much force a rock climber would experience when they fall, at first I thought the rock climber would have some potential energy ($E_p$) given they are a certain distance up ($h$), have mass ($m$) and are under the…
James
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Baseball Flight Path

I am trying to come up with an equation that is able to estimate the magnitude of the velocity a ball after it travelled a certain distance in the $x-$direction. I came across the following site here and want to incorporate drag into the…
William Garske
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Deduction of movement dynamics (Newton's laws)

I'm working in the following paragraph If I consider a model which is supported to rotate freely about an axis through its center of gravity. if the model is placed in a uniform flow perpendicular to the axis, then it does pitching motion. Let…
Skinner.
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How to calculate the centripetal force along a cartesian axis?

If a centrifuge without a ballast is centered on the origin of an x-y coordinate plane, and starts at the x-axis rotating with increasing velocity counter-clockwise around the origin, how can the centripetal force of this accelerating centrifuge be…
User3910
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How to calculate the moment of inertia of a Cylinder with body axis through the center

doing some physics I stumbled over a problem. In a book of mine the moment of inertia of a Cylinder with the body axis through the center can be calculated with the formula in the picture. I tried to calculate this formula using the general term for…
Mo711
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Physics problem regarding a sliding box and variable retardation

I am currently working on a physics problem that asks to solve for the velocity at a certain distance when a box is slid with an initial velocity of 10 m/s. The problem also gives a variable force that is retarding the motion of the box. This…
ExoticFerrari
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Orbital velocity decreases with radius, yet to increase altitude a spaceship must accelerate. Where does the velocity go?

The following has been bugging me recently and I can’t figure it out: The orbital equation of an object of negligible mass is: $$v = \sqrt[2]{MG \over r}$$ So in other words, v decreases as r increases. Yet I know that in order to increase it's…
Chopo87
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How does the length of a double open ended tube affect its frequency?

I am attempting to build a trumpet, and need to calculate the lengths of the piping for it. I have attempted to find information on this online, but have been unable to find something that can help me to understand it. I am asking this question on…
R Reed
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Calculating Internal Resistance Of A Non Ideal Voltmeter

This question in should be simple, however I'm still struggling to wrap my head round it. Question : "A non ideal voltmeter is connected across a DC battery of emf = 10V, and internal resistance. The voltmeter reads 9.8V. when the voltmeter is…
user1102081
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How to find the angle between a vector and a plane?

I have been given a Vector in $R^3$ , that hits the XY plane, and I have been given the refractive index for $Z>0 \text{and } Z<0$ , I want to find the angle this incident ray makes with the plane so that I can find the angle of refraction. How to…
math and physics forever
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