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 the change in volume (Physics question on elasticity).

A material has Poisson's ratio 0.5. If a uniform rod of it suffers a longitudinal strain of $2\times 10^{-3}$. What is the percentage increase in volume. Solution $V=\pi r^2L\implies\Delta V=\Delta(\pi r^2L)=\pi r^2(\Delta L)+2\pi rL(\Delta r)$ .…
The Cryptic Cat
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Energy of photons, and its relationship to frequency and wavelengths

I'm not fully grasping how $E=hv$ (Energy = Planck's constant $\times$ velocity) shows that the higher the wavelength, the lower the energy from the equation $c=v\lambda$ (speed of light = velocity $\times$ wavelength) But $v=f\lambda$ (velocity =…
hannah
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Motion profile, the maximum velocity allowed from stop

I´m trying to calculate what the maximum allowed velocity for a mechanical axis traveling towards a stop. The maximum velocity must be a secure speed so the axis have is able to stop in time. I have: current position current distance to…
stamp
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Distance dependent acceleration evaluation

I have been working on a derivation that deals with 2 bodies of equal mass being attracted by an effect similar to gravity. I have gotten to a point of attempting to numerically evaluate parameters for curve fitting as a means of testing my solution…
user336818
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Which formula is appropriate to use when calculating the displacement in this case?

The "reaction time" of the average automobile driver is about 0.7s. If an automobile can slow down with an acceleration of 12.0 ft/s^2, compute the total distance covered in coming to a stop after a signal is observed from an initial velocity of…
J. Doe
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Finding the radius of frustum cone?

I'm trying to understand how can i find the radius from the figure , the solution of the radius is given in the equation but I'm not getting how its derived
jack
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Two trains and a fly using the series

I'm having some difficulties dealing with this problem: A train starts travelling from A towards B. It's velocity is v. Simultaneously train starts travelling at the same velocity from B to A. The distance from A to B is d. A fly starts to move the…
user337944
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Calculating quantities with regards to a pendulum

The set up is a pendulum of length 2m with a mass on the end at 0.5kg. The mass is released at a small initial angle of 6 degrees moving into harmonic motion. I need to calculate the angular frequency of the oscillations and the maximum velocity…
Penny
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How much does water cool in 1 second

I'm wondering if I've done my calculations correctly because the units I get are really weird... So.. I'm calculating how much the temperature change in $1$ second if the temperature difference is $30$ kelvins and the cubic container ($10$ cm…
Matic
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Calculate initial velocity

If I have the equation $y'' = -g -by'$, I know that a rock was thrown straight up from a specific height h, and hit the ground at time t, how do I calculate its initial velocity? I don't understand what I use for y'' in order to figure this out?
Mikee
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physics related question

i am trying to calculate simple problem from physic,but i am getting somehow wrong answer.problem is that what is a mass of bag which is hold by child with mass $50$KG,if there is force of heaviness on both which is equal $600$N so in…
dato datuashvili
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Basic problem on deceleration

A car accelerates from rest for $15$ s with a uniform acceleration of $1.5$ m/s^2 and immediately decelerates with a uniform deceleration of $5$ m/s^2. How long does deceleration take? I used $v=u+at$ to try find to the time taken but it's turning…
sushi181
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Momentum change in an inelastic collision

Hello fellow stackexchangers, this is my first post, so sorry if this is too vague or violates guidelines. I am studying Physics and this problem came up, I will type it verbatim A small object collides with a large object and sticks. Which object…
Onion_Kurian
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Can I replot a model with an extra axis while saying the exact same thing?

I asked a poorly received question on physics stack exchange, about the universe. Today I left the comment: can we imagine the universe "expanding into nothingness" if we're clear that "nothingness" has no physical properties? i'd have thought …
user224953
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phys questions referring vectors

Three horizontal ropes pull on a large stone stuck in the ground, producing the vector forces A⃗ , B⃗ , and C⃗ shown in the figure below Find the magnitude of a fourth force on the stone that will make the vector sum of the four forces zero. Part…
user1234567
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