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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Velocity decreasing and time increasing

My question is in regards to forming linear relationships and solving through direct proportion. The question is as follows: A ball is thrown vertically upwards with a velocity v of 12 m/s, which decreases by an amount proportional to t, the number…
TGamer
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Common center of mass

Suppose I have $n$ areas of masses $m_1, m_2, ... ,m_n$, each with a center of mass $[x_i, y_i]$. They have no intersections between them - the areas are exclusive. If I consider them all as one body (one area), what is their center of mass? Is it…
SlowerPhoton
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Analytical Solution of Fick's 2nd law , what is C(x, t) = X(x) * T(t)

Analytical Solution of Fick's 2nd law Part 1 Part 2 I just want to know what is C(x,t) = X(x) * T(t) Please if any one knows pls tell me
sunny
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I know this is more about physics than maths, but can someone please help me with this question?

Half a coconut of mass $0.25$ kg is suspended from a tree branch by a light piece of string of fixed length $0.4$ m. A gust of wind displaces the bob from its equilibrium position and the center of mass of the coconut rises $20$ cm above its rest…
s20081063
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How to solve this physics problem without a calculator (for an upcoming test)

Ok so i am a student and i have bad time on high school physics because i cant use calculator on an upcoming test here is my problem transfer from 5000 second to hour now i can use calculator right now but i wont until i know how to transfer from…
Root_Jail
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Units of $sec^2/ft.lb$: What does that mean?

I'm working through a text that talks about mechanical vibrations, and I found something I haven't seen before, nor understand, yet. In the example, it gives me a weight of 16 lb. It says this is actually a measure of weight and not mass. To…
Korgan Rivera
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Wind effect on free fall

If I've a free falling object from a known height above sea level. The object has longitudinal streamlined body so aerodynamically efficient, under 0.09 drag coefficient as heading down with its nose. How can I calculate the wind effect of 10 m/s on…
Dawood
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Circular Motion Question

A small mass is suspended by a light rod from a pivot P. The mass moves with constant speed in a horizontal circle. The rod has length 1 metre and makes an angle of $30^\circ$ with the vertical. Assume $g=9.8ms^{-2}$ I solved part $A$ and $B$…
D.Ronald
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What equation is this?

A friend bought me a mouse pad that is simply labeled "Einstein's Theory" on the back. On the front it has an image, which I was able to find online through some searching. As this one: Note the URL also attributes it to Einstein. However, I cannot…
Lon B
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Solve for time given distance and acceleration and initial velocity

The problem is as follows: A car is going at initial velocity 1 m/s when a brick wall appears 50 m away. Assuming the driver reacts instantaneously and accelerates at a constant rate of 5 $m/s^2$, at what speed will the driver hit the brick wall? I…
Michael Mshtc
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Integral Definition of Center of Mass: Rope in the Plane

If the placement of a rope is defined by an even function $y (x) $ from $x=-a $ to $x=a $, what is the the center of mass of the rope?) I imagined it would be the average value of the function over the interval, but that is not the case. Or if it…
user367387
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Moment of inertia of sphere

I know that the moment of inertia of a sphere is $\frac{2}{5}mr^2$ but using the perpendicular axis theorem we can get that the $I_z=I_x+I_y$ and they are all equal in case of the sphere because of its symmetry, therefore $I = I + I$ and then $I=0$!…
Ahmed Maher
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AB-Matter paper, understanding what a variable represents?

One meter of AB-needle has line having n = 5.7*10^-14 nucleons with mass m = 1.67*10^-27 kg. Total mass of one meter AB-needle equals only 10^-12 kg/m. M1 = nm = 5.7*10^-14 ×1.67*10^-27 = 10^-12 kg/m. One million kilometers of AB-needle weights only…
BlingSco
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Why are we studying unitary representations of Lorentz group?

Does it have any physical meaning
user472054
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How to get a equation from relation of three functions in physics.

Let $\rho = K* \frac{P}{T} $ where K is s real constant number. So $\rho$ is related to $\frac{P}{T}$. Someone said that we can conclude from this: $\frac{\Delta\rho}{\rho} = \frac{\Delta P}{P} - \frac{\Delta T}{T}$ Equation (I) Delta is the common…
titansarus
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