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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finding speed given acceleration and displacement but without velocity and time

Your task is to correctly answer the following question: Assuming the spinner starts from rest, what will its speed be (in cm/s) after travelling 250 cm? the acceleration is 1.57cm/s/s but how are you supposed to solve this without velocity and…
Mo Salah
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Mechanics- problem solving

The distance from point $A$ to point $B$ is $s$. In the motion from $A$ to $B$ and back, the speed for the first part of the motion is $v_1$ and the speed for the return part of the motion is $v_2$. The average speed for the entire motion is…
Shah21
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Finding $E_4$ after minimizing $E_m$

When approximating an even function with period $2\pi$ by a Fourier-cosine-Series with $m$ terms, it has the error $$E_m=\int_{-\pi}^\pi \left[f(x)-\frac{a_0}{2}-\sum_{n=1}^m a_n \cos(nx)\right]^2 dx$$ Now I have to find the $a_n$'s which minimize…
Adam
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Minimizing the MSE of a cosine Fourier Series

When approximating an even function with period $2\pi$ by a Fourier-cosine-Series with $m$ terms, it has the error $$E_m=\int_{-\pi}^\pi \left[f(x)-\frac{a_0}{2}-\sum_{n=1}^m a_n \cos(nx)\right]^2 dx$$ Now I have to find the $a_n$'s which minimize…
Adam
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Calculating the length of a train

In the above question, I tired to calculate the length of the train as 300/1200 + 3/1200 = 11/400 Km But they are subtracting the above length. I'm not sure why they are doing so.
Simran
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How to calculate theoretical and experimental data in general physics´experiments?

I m trying to figure it out how to calculate experimental time, experimental speed,experimental acceleration, theorical time,theorical speed and theorical acceleration. I need to calculate theoretical and experimental data in general…
Charlie Van Basten Øydne
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Is the following problem lacking more data?

I encountered the question below on a national-level high school test that took place today. "Two ships, A and B, depart from the port at the same time. A sails at 8 km/h on a 120 degree course. B sails on a 195 degree course. After 90 min, the…
X HOxha
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Distance of object when it is moved away

I also asked this on StackOverflow but this is a better place to ask the question. Suppose an object of 4cm is right in front of my eyes. I move it further away till it appears to me to be of 2cm. Is there a way to find out how much I moved it? I…
Shauryagoel
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weird rate problem that I can't solve

Two teams compete in a relay race, they're composed of 4 members, each of whom runs 100 meters. All of the members of team B runs at $b$ meters per second (mps). The first 3 members of team A can only run at 5$b$/6 (mps) while the 4th member runs at…
Anthony
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Calculate maximum speed for a car in game

I'm trying to write a program that will simulate driving a car along a given route. I would like to ask if there is a fairly simple way to calculate the optimal speed/velocity for each section of the route, assuming that we know parameters such as…
MlodyPL
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A 86kg person jumps and plunges 2.6m deep into water before coming to a stop. How can I find the force of friction from the water?

Their velocity before hitting the water is $10.48m/s$, and I want to use the conservation of energy formulas. I also went ahead and calculated the acceleration $(13.62m/s^2)$(edit: its $21.12m/s^2$), in hopes that would help, by using $F=ma$, but…
Lean Summers
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A small block rests on a piston. When does the mass leave the piston?

I'm having difficulty with this physics problem. A small block that has a mass equal to $m_1$ rests on a piston that is vibrating vertically with simple harmonic motion described by the formula $y = A \sin(\omega t)$. 1)Show that the block will…
Ann Watson
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Any central force implies conservation of angular momentum

It is well known that not only a central force of 1/r^2, but any central force directed to one central point implies kepler's second law or the conservation of angular momentum. But how exactly can this be seen?
metuk
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How many coils I have to cut from a spring do to change it from 18 Joule to 10 Joule

In spring-powered airguns you calculate the effect in Joule. I would like to change the spring in my airrifle but where I live the legal limit is 10 Joule and I bought a 18 Joule spring (there are no 10 Joule springs for sale). This spring is 337 mm…
Lucian
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How to construct the hyperbolic embedding space for metric

I'm having trouble going to different coordinates for the hyperbolic geometry metric: $$dl^2=d\chi^2\, - \, \frac{1}{\kappa}\sinh^2(\sqrt{-\,\kappa}\,\,\chi)\,\big(\,d\theta^2 \, +\, \sin(\theta)^2 \,d\phi^2 \, \big), \,\,\,\,\,\, \kappa <0$$ How…
Linus
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