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.

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Can someone clear up this statement on resisted motion (Dynamics)?

Due to missing a lecture (for health reasons), I'm reading my lecturer's notes on the resisted motion of a particle where air resistance is proportional to the square of the particle's speed. Here is what I gathered and understood well: If a…
Max Echendu
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GRAVITY formula understanding

can you help with this. Why in finding gravity the masses of two objects are multiplied. I don't understand the value of mass over gravity and why the masses are multiplied and then divided by distance. In one sentence I don't understand the idea…
PowerPuffGirl
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Showing a force is conservative by analyzing the curl of the vector

I'm given a problem where I need to determine whether or not force $F$ is conservative, and verify by showing that it is equal to the gradient of potential $\nabla U$, for $F = (y, x, 0)$ I tried solving be verifying that $\nabla \times F = 0$,…
George
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How to find focal length of a convex lens?

I need help finding the focal length of a single convex lens. The radius of curvature is 200mm. left side is air and the glass has a index of 1.5. I search on google but there was only formulas for think lens, convex and converge lends. I need the…
user101699
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Finding missing quantities of a ball thrown at a building?

A baseball thrown at an angle of $55.0°$ above the horizontal strikes a building $18.0\,m$ away at a point $5.00\,m$ above the point from which it is thrown. Ignore air resistance. Find the magnitude of the initial velocity of the baseball ( the…
anon
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Calculate the work required (by external forces) to transport charge from its location on the figure to infinity.

Three charges are located in the $x-y$ plane (see plot below), with $Q_1 = -6.00 μC$, $Q_2 = 2.00 μC$ and $Q_3 = 3.00 μC$. Note that the charges are located at grid intersections points. Calculate the work required (by external forces) to transport…
Bailey
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How find vectors after spinning counterclockwise?

$\vec A$ has the magnitude $13.5$ m and is angled $68.0°$ counterclockwise from the positive direction of the x axis of an xy coordinate system. Also, $\vec B$ $= (11.5 m)i + (7.15 m)j$ on that same coordinate system. We now rotate the system…
user366783
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How to find magnitude and direction from sum of vectors?

I have a problem similar to : http://physics.mercer.edu/balduz/GenPhys/HRW7probs/03vectors/3-048.pdf If A = 10i and 1.63j, what's the next step to finding magnitude and direction? Does it involve multiplying sin/cos? In what combo? What about tan…
user366783
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How to find magnitude from vectors?

If $\vec B$ is added to $\vec A$, the result is 4.8i + 1.2j. If $\vec B$ is subtracted from $\vec A$ , the result is −3.20 + 5.8j. What is the magnitude of $\vec A$? Am I supposed to subtract the two, so 8i - 4.6j? But then how would I find A's…
user366783
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What's 110 degrees counterclockwise from positive direction of x-axis?

What are the x and y components of a vector a with arrow in the xy plane if its direction is 110° counterclockwise from the positive direction of the x axis and its magnitude is 8.7 m? Am I supposed to solve by multiplying 8.7 and 110 and cos to…
user366783
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How to plot $x(t), v(t),$ and $a(t)$?

If the position of a particle is given by $x(t) = 47t − 3t^3$, where $x$ is in meters and $t$ is in seconds, Graph $x(t), v(t),$ and $a(t).$ I'm not sure how to approach this. Should I differentiate the equation to get $v$, then graph that? But what…
user366783
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Solving for Displacement given Velocity and Acceleration?

I have given a problem to solve for the displacement of an object given the acceleration $-10\;\mathrm{m/s^2}$ and the initial velocity $627\;\mathrm{m/s}$ of how far an object shoots up, though I am not given the time, so I can't use the equation…
ariagno
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Acceleration problem

At the instant the traffic light turns green, an automobile starts with a constant acceleration a of 2.3 m/s$^2$. At the same instant a truck, traveling with a constant speed of 9.8 m/s, overtakes and passes the automobile. (a) How far beyond the…
user366783
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Acceleration word problem

A shuffleboard disk is accelerated at a constant rate from rest to a speed of 4.8 m/s over a 1.9 m distance by a player using a cue. At this point the disk loses contact with the cue and slows at a constant rate of 2.2 m/s$^2$ until it stops. (a)…
user366783
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Vertical Velocity Question and Acceleration

An eraser falls out of your back pack while you are walking down the hall. You are walking at a speed of 0.2 m/s and the distance from the backpack to the floor is 1 meter. a) How long does it take for the eraser to hit the ground? b) What is the…
satjav
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