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.

5951 questions
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confusion on force = mass x acceleration

this doesnt even make sense if force = mass x acceleration then thats like saying a car that weighs 2000 kg traveling at 80 mph and not accelerating will hit you and there will be no force but i would definitely get run over???? (no) how does this…
Saketh Malyala
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formula to convert rad to rev?

I spent ten minutes googling and can't find it anywhere. What is the formula to convert a rev to rad? What is the formula to convert a rad to rev? I think the first is 1 rev = 2 pi * rad and the second is 1 rad = 2pi / rev Is that right?
user444658
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Consider a cube of 1 Ohm resistors...

What is the resistance between 2 points in a cube of 1-ohm resistors? I am asking about each of the cases: 1) The 2 points are connected by 1 edge 2) The points are 2 edges from each other 3) The points are antipodal (if such a word can be used in…
mtheorylord
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How to find tangential accel?

https://i.stack.imgur.com/6U3uJ.png I think this is a differentiate problem? How would I do this? Just 0.3t^2 ? And then put the 5 in there? So answer is 15?
user435909
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How to find resultant change in speed?

"A 79 kg man is riding on a 38 kg cart traveling at a speed of 5.0 m/s. He jumps off with zero horizontal speed relative to the ground. What is the resulting change in the cart's speed, including sign? " I have: $$(79+38) \times5 / 28 > 15.4 - 5 =…
user435909
  • 25
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Simplifying Expression for Potential Energy of a Uniform Rod Attached by a Light String to a Fixed Point

I am self-studying through Mathematical Methods for Physics and Engineering and have come to a bit of a roadblock in chapter nine, on normal modes. As pictured, the system is a uniform rod attached to a fixed point $P$ by way of a light string. The…
Luciano
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Volume of ellipsoid in "On the Electrodynamics of Moving Bodies"

On Einstein's famous paper, in the section on the transformation of light energy between frames of reference, Einstein devises a thought experiment to determine it. He imagines two frames of reference, $K$ and $k$, in which $k$ moves relative to $K$…
Phineas Nicolson
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How to calculate active load on a swingset?

Related to this question from DIY StackExchange. Given a beam (a swingset) with three swings suspended from it. Each swing holds 450 lbs of stationary load for a total of 1,350 lbs of stationary weight suspended from the beam. All three swings…
The Evil Greebo
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Direction finding help

I don't understand why this is incorrect. It's y/x times tan inverse, right?
user416503
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how find lower, higher values , given radius and height?

One cubic centimeter of a typical cumulus cloud contains 50 to 500 water drops, which have a typical radius of 10 μm. For that range, give the lower value and the higher value, respectively, for the following. (a) How many cubic meters of water are…
user416503
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Velocity/Acceleration Problem

My engineering physics teacher gave the class practice problems for the upcoming exam, but I can't figure out how this one problem is supposed to be solveable. A red car and a green car, identical except for the color, move toward each other in…
tmac1
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Write an equation for density, using the variables provided

I have no idea how my answer is wrong. I am so certain it is right. This problem asks me to use THEIR variables to solve for density. density = $\frac MV$ $M$ can already be used for Mass, it's $9.25$ kg in this scenario but they want VARIABLES,…
dmscs
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Displacement word problem

In the figure below, a radar station detects an airplane approaching directly from the east. At first observation, the range to the plane is $d_1 = 380\ \text m$ at $40^\circ$ above the horizon. The airplane is tracked for another $123^\circ$ in the…
user366783
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Angle between the positive direction of the x axis and a line tangent to the particle's path

The position $\vec r$ of a particle moving in an xy plane is given by $\vec r$ = $(1.00t^3 − 3.00t)i + (8.00 − 9.00t^4)j$, with $\vec r$ in meters and $t$ in seconds. In unit-vector notation, calculate the following for $t = 2.10 s$. What is the…
user366783
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Differentiating for velocity

The position $\vec r$ of a particle moving in an xy plane is given by $\vec r$ = $(1.00t^3 − 3.00t)i + (8.00 − 9.00t^4)j$, with $\vec r$ in meters and $t$ in seconds. In unit-vector notation, calculate the following for $t = 2.10 s$. I found $\vec…
user366783
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