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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How to find work done by force?

I don't get it. I think it's supposed to be $W = Fd$ and $k = \frac 12 mv^2$... but I don't get which numbers are supposed to go where. Am I supposed to do $12.5 \times 12$?
user416503
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Is optical reflection loss through multiple objects added or compounded?

I am taking a solar cell class and came across a question that deals with reflection losses as light passes through multiple materials before it reaches the solar cell. I tried to look up optical properties and laws, but can't seem to find the one…
user1362058
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How much force needs to be applied to get a body to a new position time?

I have a physics body with a mass m and existing non zero linear velocity v and position p. How much force needs to be applied to get it to a new position pn in t seconds?
Ian Hern
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How can I find angle between vector?

https://i.stack.imgur.com/KVuPo.jpg I don't understand the step on the right that starts: "We next apply Eq 3.20..." (that equation is the same as the e-28 on the left side). How are the angles determined to be $0^\circ$ and $90^\circ$?
user138342
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position of particle

The position of a particle moving along the $x$ axis depends on the time according to the equation $x = ct^2 - bt^3$, where $x$ is in meters and $t$ in seconds. What are the units of (a) constant $c$ and (b) constant $b$? Let their numerical…
user138342
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What speed should a record rotate under a needle

I have the question "An Lp record rotates at 33 and a third rpm(revolutions per minute). What speed does the record rotate under the needle when the needle is 14cm from the centre hole?" So I first made the radius 14 cm into 0.14m, And the rpm from…
Dan
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X and Y collide elastically, find angle of Y

A particle X moves with constant velocity collides elastically with an indentical particle Y which is stationary. After collision, X moves at an angle of 30° to its intitial direction of motion. What angle does Y make with the initial direction of…
Ray Jasson
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Charged metal spheres connected by a spring

Two initially uncharged identical metal spheres, 1 and 2, are connected by an insulating spring (unstretched length L0 = 1.39 m, spring constant ks = 20.7 N/m), as shown in the figure. Charges +q and –q are then placed on the spheres, and the spring…
Bailey
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Physics Problem

You measure a watch's hour and minute hands to be 7.2 mm and 11.7 mm long, respectively. In one day, by how much does the distance traveled by the tip of the minute hand exceed the distance traveled by the tip of the hour hand?
Long Trang
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Sound Intensity Level

The question is: The noise from a vacuum cleaner is 85 dB while that from a television set is 78 dB. What is the intensity level of the two sounds together? i can't find the right formula. thanks.
jeo
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Is it true that an object is accelerating if acceleration $a$ is non-zero?

Is it true that an object is accelerating if a $\ne 0$ ?
Yusha
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Dimensional Analysis Limitations

Since dimension doesn't depend on magnitude. Hence, if a relation is dimensionally correct then it doesn't mean that it will also be mathematically or physically correct. What will be the vice-versa? Please answer these three questions. Q1. If a…
Chrishiv Tamta
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Physics question about Impulse and Force, please!

We're out currently because of Coronavirus so all of my assignments are online because we're stuck inside. I was struggling before when I had a teacher, but I'm really struggling now without. He's linking most of our assignments to this site called…
Nicole
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Find km/h with Kinetic Energy and mass?

Sorry for the picture the math formatting is very hard. I'm trying to answer the exercise 4 which asks for (title). The info given is: Kinetic energy: $6,73*10^-19$ Mass: $9,109*10^-31$ My problem isn't the question itself it's actually only what…
Yves Bonneau
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What is the number j?

So, I've been hearing that $e$ and $i$ are not the only numbers out there that are represented and known by a single letter in the English alphabet. Apparently, there is also the number $j$. What is the number $j$ and is it irrational or not? I know…
Xavier Stanton
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