Mathematics Stack Exchange
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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 are satellites accurate with their distances?

Not sure if this is the right forum, but I know this can be explained with some math that I haven't been able to find. Thanks. With the formula $d=cr$ we can get the distance between two points, $r$ being the time it takes for a signal to reach B…
Erik
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Summation for Average Speed

How would I write a summation for the average speed of an object, given $10$ speeds (which were calculated $r=\frac{d}{t}$)? Would it be: $$ \sum_{i = 1}^{10} \frac{d_i}{t_i}$$ or am I wrong? I'm not sure about the subscript i's after distance and…
GunnarJ
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What is the average speed for the entire trip?

A train leaves on station 80 miles/hour for 3.5 hours and 70 miles/hour for 2 hours to reach it's destination. What was the average seed for the entire trip.
Ramsky Padig
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Conduction modeling

This might seem like a simple question, but I cannot for the life of me find a solution through google. How long would it take for a hot metal block to reach room temperature? Google only shows examples for water in a container, which is an example…
The Big Cheese
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Distance along a line at a given time, taking speed change into account

I'm trying to calculate the distance along a line at a certain time, taking the speed change into account. What I have, two points (lat, lng), the time between the two points, the distance between the two points and the speed at both points. What I…
Sandwich
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Physics dealing with distance

The distance $s$ in feet that a thrown object will fall in $t$ seconds is given by $$s=16t^2 + vt\;,$$ where $v$ is the initial downward velocity in feet/second. Find the initial velocity of an object that falls $80$ feet in $2$ seconds.
Jane Verin
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What is rotational inertia or moment of inertia? What is its equivalent in linear quantities?

What is rotational inertia or moment of inertia? What is its equivalent in linear quantities? I know what rotational inertia is; I just can't think of the equivalent in linear quantities please help.
tortugaaaaaaaa
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Sign of the Velocity in Simple Harmonic Motion

Currently in Mathematics we are learning about "Simple Harmonic Motion" and how it satisfies the differential equation $\ddot x = -n^2 x$. Does this mean that the velocity($v$) in terms of displacement($x$) will always have a $\pm$ sign as the…
frog1944
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How is x-com found?

https://i.stack.imgur.com/dXam5.jpg I tried to follow the steps for the similar problem, but there's not enough explanation. It says -d1/2 = -13cm/2 . However, the problem for that says d3 is 13 and that d1 is 11. Why are they referring to d1 as if…
user442847
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About Momentum Question

I've $3F.r + 2F.2r - F . r = 6Fr$ momentum. is this momentum at clockwise or counter clockwise? And why? sorry for these questions because I'm new at here. Thanks!
user442706
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How would I find these values?

"The function x = (2.5 m) cos[(4π rad/s)t + π/2 rad] gives the simple harmonic motion of a body. Find the following values at t = 5.0 s. " (a) the displacement m (b) the velocity (Include the sign of the value in your answer.) m/s (c) the…
user442847
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How to find height?

The figure below gives the speed $v$ versus time $t$ for a $0.520$ kg object of radius $6.20$ cm that rolls smoothly down a $30^\circ$ ramp. The scale on the velocity axis is set by $v_s = 4.0\text{ m/s}$. What is the rotational inertia of the…
user435909
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Magnitude of torque in this case

I want to solve this problem so I need help. The problem wants to determine which is in the direction (+) or (-) and value of torque. I think an answer: In the direction (-) and 5F.r
user442706
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Angular momentum problem

For a, I did: $width = 4m$ ; $F = 19 N$ ;$ work = 205 rev/min$ or $3.42 rev/sec$. Then, $m=F/g = 19/9.8m/s^2 = 1.94 kg$ Then, $a = 1/12mr^2$ Then $1/12 (1.94 kg)(4m^2)$ So, $I = 2.6 kgm^2$ For b, I did: momentum = Iw = 2.6kgm^2 * 3.42 rev/s =…
user442415
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Falling dominoes ode??

I am doing a modelling project and my teacher told my group to modelling falling dominoes. In order to do that, we need to know which forces exists in this system but we cannot figure out which force is not included in our model because it doesnt…
Banach333
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