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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Instantaneous velocity or acceleration

The trouble Im having is with instantaneous velocity or acceleration. Almost all questions give a function that I can take a limit of. But how would one model data as a function? Oh and It cant be linear..
Andrew Graham
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Initial velocity certain equation

The question is: Ball A is dropped from the top of a building of height h, and simultaneously Ball B is thrown vertically upward. If the two balls collid at height h/3, what is the initial velocity of Ball B? The answer they are looking for…
Taylor Huston
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How to calculate centre of mass of an object

I'm new here and this is my first post so please forgive me if I've not posted it in the right place! It's an Engineering related question but as maths is involved I thought it may be appropriate to ask here... I'm given the co-ordinates of a…
Jack
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Objects Behind Safety Net/Cage Thrown Forward at Highway Speed

I contacted the University of British Columbia Mathematics Department regarding this, and they directed me to post my question here. We are trying to improve the safety of equipment storage in our vehicles. SCENARIO A Inside a vehicle, there are…
Rob Brownridge
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Physics Conservation of Energy Problem

In the figure below, a block is released from rest at height $d = 24 \; \text{cm}$ and slides down a frictionless ramp and onto a first plateau, which has length $d$ and where the coefficient of kinetic friction is $0.50$. If the block is still…
user72195
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calculate drag in 3D

I'm trying to make a simple explicit dynamic solver for projectile motion in 3D, including drag and gravity, and suspect I'm doing something basically wrong. Drag force is given by $D = 0.5 \rho V^2 C_d A$ I thought about it, and decided that I…
missed
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Acceleration and Tangential Velocity Vector?

Find the resultant acceleration of a particle moving on a circle of radius $0.70\ m$, if its angular speed is 37 rpm and its tangential acceleration is $2.9 \frac m{s^2}$. Express the angle with respect to the tangential velocity vector. I thought…
Shane Yost
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$d_1 = 5\hat{i} - 2\hat{j} + 4\hat{k}, d_2 = -5\hat{i} + 2\hat{j} -\hat{k}.$ What is $(d_1 + d_2)\cdot(d_1 · 2 d_2)$?

$$\begin{align} d_1 & = \;\;\;5\hat{i} - 2\hat{j} + 4\hat{k}\\ d_2 &= -5\hat{i} + 2\hat{j} - \hat{k} \end{align}$$ What is $(d_1 + d_2)\cdot(d_1 · 2 d_2)$? For some reason the homework problem needs an exact number answer already. When I solved it…
Srishti Sharma
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Application of Stoke's Theorem

$\newcommand{\unit}[1]{\hat{\mathbf{#1}}}$ Verify the truth of Stokes' theorem in the case when $\mathbf{v} = y\unit{i} + 2x\unit{j} + z\unit{k}$, if the path $C$ is a circle $x^2 + y^2 = 1$ in the $xy$ plane and the surface is the plane area…
dustin
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How we can calculate the acceleration of a body using the second law of newton

If we hit a box (mass = $2$ kg, at rest, without friction) with a force of $2$ Newtons, how do we calculate the acceleration of the box upon hitting using the second law of newton? I tried this: $f = m*a$ $a = \frac{f}{m}$ => $a = \frac{2}{2} =1$…
Aymen
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Determine the magnitude of the vector sum

Determine the magnitude of the vector sum $V = V1 + V2$ and the angle $θx$ which $V$ makes with the positive x-axis. I get $B$ to be 37.0414 but I am not sure what to add it do to get the correct angle.
R3alAli
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Calculate the time of a ball from a to b

I want to build an automated pinball game. The plan is to place two light barriers (A and B) on the field. The time from A to B is measured and then the needed time from B to the flipper arm(s) C is calculated. An idealized environment is assumed.…
Kati
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Initial Velocity of a Thrown Rock

Your friend is standing below the window outside of our classroom and attempting to throw a rock past the window to get your attention. The rock is thrown straight up in the air and passes our window 0.40s after being released. It passes the same…
Sandro Hallado
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A convex spherical refracting surface

I'm trying to solve the following problem: A convex spherical refracting surface with a radius of 0.6 m separates a medium whose index of refraction is 1.5 from another whose index of refraction is 2.0. An object is placed in the first medium 1.0 m…
user1259404
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Plano convex lens refraction angles formula

I am designing an optical device with several plano-convex lenses. In order to determine several measurements I need to be able to calculate the resulting refracted angles in a diagram like this: (determine a2 if i know a1) lens diagram However,…
Birger Evansson
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