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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Geostationary orbit

We have the following governing equations for the motion of a satellite around the earth under gravity: $\dfrac{-GM}{r^2} =\ddot{r} -r\dot{\theta}^2$ $r^2\dot{\theta} = h$ I want to find the height at which a satellite appears stationary to an…
Warz
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Forces and line of action

A force $F_1 = i - 3j -2k$ at the point $r_1 = -2i + 9j$ another force $F_2 = 2i + j -3k$ at the point $r_2 = i + yj -k$ and a third force $F_3$ are equivalent to zero. Find y for this to be possible. Find $F_3$ and its line of action in this…
Warz
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Calculating time taken to get down a slope

I'm doing my homework for a Physics class and trying to get ready for a quiz. I encountered this question: Two ramps of equal length are situated such that ramp #1 has a slope (with respect to the horizontal) of 30°, and ramp #2 has a slope of…
Asdf
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Solving for equipotential lines

First off, I apologize if this is in the wrong section of StackExchange, it's at the intersection of several different topics (mathematics, physics, and computer science), so I chose the section that seemed most relevant. In my high school AP…
Drew
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Obtain hamiltonian from a lagrange functional.

Assume that we have a Lagrange functional $L = L(\psi, \partial_t\psi,\partial_x\psi)$ with $\psi:(x,t) \rightarrow \psi(x,t)$. From the this I want to calculate the Hamiltonian. I was wondering how here the generalized impulses look like? For…
physicsGuy
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Physics Question about parabola projectile angle

A projectile is launched over level ground at $35 \frac{m}{s}$ at an angle of $24^{\circ}$ above the horizontal. Friction is negligible. What is the velocity (magnitude and direction) of this projectile $2.5$ s after launch? For the magnitude do…
John
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Simple Projectile Motion Questions

$1.$ A ball is hit with an initial horizontal velocity of 33 ft/sec and initial vertical velocity of 51 ft/ sec. How long does it take for the ball to go from its max height to the ground? My attempt: I assume I only need to worry about vertical…
Drake
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Determine coordinates $x_c$ and $y_c$

Answer: $x_c=18.2$ and $y_c=9.5$. Who can solve with explanation?
Anzor Bukhrashvili
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Physics: Calculating the Forces Needed from an Angle and a Force

This is probably a very simple question to all of you, but I have never taken a physics class, so I am lost for what I need to do for a programming problem. I will need to specify a force by inputting the newtons x, newtons y, and newtons z. How can…
MattBell
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Intuitive understanding of work.

I am working on a problem that has to do with work. I am also assuming that the acceleration due to gravity is $10m/s^2$. A 15 kg crate is moved along a horizontal floor by a warehouse worker who's pulling on it with a rope that makes a 30 degree…
hyg17
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Sound - minima and maxima

A loudspeaker L is placed between a microphone M and a screen S reflecting sound waves. The loudspeaker emits sound of fixed wavelength $\lambda$ in all directions. When the screen is moving slowly, to the right along the $x$ direction (slowly…
Phaptitude
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Constant force applied parallel to the surface

Question: A 4.04kg box sits at rest at the bottom of a ramp that is 8.62m long and that is inclined at 40.0∘ above the horizontal. The coefficient of kinetic friction is 0.40, and the coefficient of static friction is 0.50. What constant force F ,…
Username Unknown
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Ratio of distances from a planet

Io and Callisto are satellites of Jupiter. Their periods are $1.77 d$ and $16.7 d$. What is the ratio of their distances from Jupiter? I assume that I have to use Kepler's third law of planetary motion to find the ratio. I plugged the periods into…
Kot
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Flowerpot falls off a windowsill

A flowerpot falls off a windowsill and falls past the window below. You may ignore air resistance. It takes time $0.420sec(s)$ to pass this window, which is of height $1.90meters(m)$. How far is the top of the window below the windowsill from which…
Username Unknown
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Find electric potential at a point at the edge of a charged disc of uniform surface charge density

If I've made any mistakes, please point them out in the comments Find electric potential at a point at the edge of a charged disc of uniform surface charge density I started by setting up a curved charge element(an Arc), and took the point about…
math and physics forever
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