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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Finding the force ground applied to the object.

An object whose mass is $m$ is crashing into the ground and leaping with the same velocity. If the duration of the interaction between the object and the ground is $0.1$ seconds, determine the force ground applied to the object. I know…
Busi
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What is the real radius of capillary tube?

You have a capillary tube in a capsule whose refractive index is $n = 2$. You notice that the radius of capillary tube seems $1.50mm$. What is the real radius of capillary tube? I'm having trouble with this optics question. Let's take a look at…
Busi
  • 572
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How much $g$ can the wire be accelerated?

A wire can withstand the tension $T_{max} = M_{max}\cdot g$. If we hang on an object with the mass of $m = \frac{M_{max}}{10}$ at the end of the wire, how much $g$ can the wire be accelerated? ($g$ is gravitational force) I've tried equate…
Displayed
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Center of Mass in 1 dimension

Although it might be a simple question, I'm struggling with something here: Suppose you have 3 mass-points along the X axis, each one having masses $M_1, M_2, M_3$, at positions $x_1, x_2, x_3$, respectively ($x_1 < x_2 < x_3$). Now I wish to find…
leleo222
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The Total Rotational Inertia of a Bar with Two Cylinders

As shown above we know that the $L_{bar} = .864 m$ and that $M_{bar} = .833 kg$ Using this we can easily find the rotational inertia of a bar by using the formula $I_{bar} = \frac{1}{12}ML^2$ Which plugged in with the given numbers gives roughly…
Alex
  • 443
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How to verify my ballistic pendulum calculations (please read if you have a newtons cradle)?

I don't have a newtons cradle but we are theoretically using one to do a ballistic pendulum lab. We are supposed to show through calculations how the conservation of energy works and how the conservation of momentum works. I fudged my numbers…
HeavenlyPanda
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The value of the vector $\vec{A}$ is given as $15$cm, and the focal lenght is $12$cm. What is the size of resulting image?

The value of the vector $\vec{A}$ is given as $15$cm, and the focal lenght is $12$cm. Assume that $M$= Center, $F$= Focal point of this concave mirror. What is the size of resulting image? I've tried to apply the Mirror Formula…
Displayed
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Velocity-Time graph confusion

I'm not 100% sure whether this is best answered with regards to Maths or Physics, but I feel this is more mathematical. If you take the equation $y = 40-10x$. If you change $y$ to $v$ (velocity in $ms^{-1}$), and $x$ to $t$ (time in $s$), you can…
PhysicsGuy123
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Lagrangian of bead on a wire

A bead of mass $m$ slides (without friction) on a wire in the shape, $y=b\cosh{\frac{x}{b}}.$ Write the Lagrangian for the bead. Use the Lagrangian method to generate an equation of motion. For small oscillations, approximate the differential…
quanticbolt
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Normalizing wave function solution to Schrödinger equation for $V = 0$

The most general solution for the Schrödinger Equation with $V = 0$ : $$\Psi(x,t)=\int_{-\infty}^{\infty} A(k) e^{ikx} e^{−i\hbar k^2t/2m} dk$$ To normalize this, what constraints will be placed on $A(k)$? What is implied about $A(k)$…
Truth-seek
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Current going through resistor with Ohm's law?

If the battery provides a 12 V electromotive force and the resistors are each 10 ohm , what is the current going through the resistor in region A in Amps? I assume I need Ohm's law: V = IR. I would think for branch A, I would plug in the values 12 =…
tyger2020
  • 87
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Air mass and photon count above sea level

I am generally having a issue with this question as I believe it very ambiguous there been several way I have been explained how to do this, non which make really sense. Here is the question: A Type I delta-Cepheid star with a one month (30day)…
Jason Taylor
  • 187
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Compton Scattering X-rays

Question: Attempt: I need to find the theoretical peak for an 88KeV photon being back-scattered. I don't think I am understanding this question correctly.If the detector is placed 180 degrees behind photon scattered on the leg, then we are…
dan815
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Can weight have a horizontal component?

"A uniform beam, AB, of mass 14kg and length 15m, rests with A on rough, horizontal ground. The beam is supported by a smooth peg at C, where AC=13m, so that it makes an angle of 18 degrees with the horizontal. The beam is on the point of…
Miles Bardan
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Calculate the max altitude of an object launched straight up where all we know is the object's mass and the time taken from launch to touchdown.

Suppose a 10cm diameter 1kg ball is launched directly vertically with an unknown force but takes a known amount of time to return. Can we calculate the height it achieved? I'm really not very mathematically-minded but I presume we can divide the…
Moob
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