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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Heuristics for definitions of open and closed quantum dynamics

I've been reading some of the literature on "open quantum systems" and it looks like the following physical interpretations are made: Reversible dynamics of a closed quantum system are represented by a group of automorphisms (of a $C^*$-algebra,…
Dave Gaebler
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How Do You Solve for Landing Speed?

A ball is thrown eastward into the air from the origin (in the direction of the positive x − axis ). The initial velocity is $50i + 80k$. The spin of the ball results in a southward acceleration of $4 ft /s^2$ , so the acceleration vector is…
Robert
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Find the magnitude, angle of acceleration and the angle of a particle's direction of travel

So I'm doing a Physics problem and have run into a snag with the online homework - every answer I've tried keeps getting rejected and I'm down to my last shot and I don't know what I'm doing wrong. The problem is as follows: A 0.36 kg particle…
secondubly
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Simple physics question; about the instant speed at given time?

I'm doing some very basic physics tasks and something that seems to come up a lot is the following. Being able to view when(seconds) the speed (m/s) is equal to some average-speed calculated in an earlier step. The graph would have seconds on the…
Algific
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Finding greatest value of a trigonometric expression involving two angles

A particle is projected up a plane inclined at an angle $b$ to the horizontal, the angle of projection being $a$ above the horizontal. Part 1: If the initial speed of projection is $V$ m/s show that range, $C$, on the inclined plane is given…
Jim
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mathematical justification or creating a mathematical problem of the last part of a gauss theorem proof

this page proves the gauss theorem. First they prove that there has to be charge allocated in the origo of a function and that this is where you get the gauss formula and therefore you can integrate over any shape and obtain the same value. It is…
torgny
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What's the total of battery if 50mA of current are provided to a load for 1 hour?

What's the total charge that moves from one terminal of a battery to the other if 50mA of current are provided to a load for 1 hour? I think I'm suppose to use the formula I = Q/t, where I is the current in amps, Q is Coulombs and t is time in…
echo
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Specific volume of an air parcel

So I have an unsaturated air parcel in the atmosphere that ascends adiabatically from the $1000$ mb level to the $700$ mb level with its initial temperature being $10$ degrees Celsius. I have to find the initial specific volume in $m^3/kg$. I know…
Sofia June
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Acceleration to speed at specific distance and time

My brain hurts and I'd really appreciate some help with this formula. I am currently at 0m travelling 50m/s. I want to decelerate and come to a stop at 10m in exactly 0.5 seconds. What should be my acceleration to achieve this. No mechanics formula…
Simon
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Evolution curves on dynamic system

The matrix of a linear dynamic system is: [0, 3] [3, 0] FACT: If A is the evolution curve that passes on point (1,1) in phase space and B the evolution curve that passes on point (1,-1) we can say that origin is the negative limit of A and…
pedroh
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Centre of Mass and Moment of Inertia of a sphere - spherical cap

I have been given a sphere of radius a, from this sphere a cap of hight h is cut off. 1) What is the centre of mass of the rest of the sphere? 2) What is the moment of inertia regarding the axis of symmetry? 1 - no real Idea how to do it. 2 - I…
user155452
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How to calculate direction of ball upon collision?

I'm creating a game (Breakout) that involves a paddle and ball. I'm having trouble calculating the direction that I should send the ball after collision with the paddle. Currently, upon collision I've reversed the Y velocity of the ball so it gets…
user143772
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A question about the Laws of Thermodynamics

Many popular and semi-popular books about cosmology have appeared during the last few years in which the ultimate fate of the Universe is conjectured. One such scenario stipulates that space will expand forever and will contain nothing but electrons…
Garabed Gulbenkian
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Air friction question

Suppose I throw a ball up in the air (with air friction $b>0$) at time $t=0$ and it lands at time $T_1$. So we have the equation: $$m\frac{\mathrm{d}v}{\mathrm{d}t} = -bv + mg$$ And suppose I throw a ball up in a vacuum (with the same initial…
Craig Feinstein
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Magnus Force Calculations returning null.

Hey i didnt know whether to come here or stack overflow as i have a programming problem for a mathematics equation. Im getting a null value back when calculating the magnus force(spin). Im using XNA so that i can represent the data graphically and…
Pendo826
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