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Questions tagged [string]

This tag is for non-relativistic material strings, such as, e.g., a guitar string. PLEASE DO NOT USE THIS TAG for relativistic strings and string theory.

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3answers
30 views

Force required to lift a block [duplicate]

Let us consider block of mass $m$ hanging by rope with force $T$. When no other horizontal and vertical forces are acting on a block, the block is at equilibrium if $$T=mg.$$ And if the rope is pulled ...
-1
votes
0answers
9 views

Centre of mass frame [on hold]

Say I have two bodies A(mass 2m) and B (mass m) connected with a string (taut) and I project A with some velocity v perpendicular to AB . So is there any way to find the Tension in the string? I ...
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1answer
33 views

How to draw diagrams of Path, velocity and time for a complex problem?

What does an approach or a solution strategy look like for the following problem: Two point-shaped bodies with the masses m_1=100g and m_2=200g are connected to a string of 30 cm length and lie on a ...
1
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1answer
19 views

To isolate a particular mode of vibration in a standing wave on a string

Suppose a string bound between two rigid end-points is vibrating and it is a combination of a number of normal modes of vibration, is it possible to isolate a particular mode of vibration in wave by a ...
0
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1answer
37 views

Acceleration of a mechanical system [closed]

The mechanical system is as above (the only peculiarity is that both strings are allowed to move, so the disc can also move up and down) and I have been tasked with calculation the translational ...
2
votes
1answer
58 views

Stupid pulley question [closed]

I started self-studying physics and it's been 15 years, since I took basic mechanics in college. It seems to me that I'm unable to figure out how to rigorously derive from Newton's laws how a basic ...
0
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0answers
29 views

Confusion about valid set of virtual displacement

The answer of the problem below makes me confused about my thinking about virtual displacement... Consider the system in the figure below, similar to mechanisms used for aerial filming of sporting ...
0
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0answers
28 views

When does a steel cable snap?

We have a woven cable made up out a large number of thin single strings of steel. Let's make the assumption the strings don't get deformed. Now the strings are not all equally thick, so let's make the ...
0
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1answer
67 views

Pulling a string with both ends fixed [duplicate]

Consider a string with both ends fixed. If somewhere in middle of it be pulled and released, how would it oscillate and what is it's equation? My solution assuming the result is a standing wave: The ...
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0answers
21 views

Tension: Forces on a string [duplicate]

Suppose a mass hanging from a string which is fixed from a beam on top. The mass will pull string with same force as its weight. String will also try to pull beam with same force and according to ...
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2answers
38 views

Question regarding a wave problem [closed]

An example problem from my openstax physics textbook: A student takes a 30.00-m-long string and attaches one end to the wall in the physics lab. The student then holds the free end of the rope, ...
0
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1answer
37 views

Stress tensor of a rope in equilibrium [closed]

First of all, let me say that I'm not a student of physics but of mathematics, so please be comprehensive. I'm currently studying continuum mechanics. As an example of applications of Cauchy stress ...
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2answers
67 views

Question about pulley

I am wondering if the tension in the ropes in this situation is the same. Doesn't it matter if the other rope is pulled at an angle? Does this change the tension in the rope? For example if at one ...
1
vote
1answer
45 views

The length of a string attached to a wall?

I feel really dumb for asking this question. I apologize in advance. When the example of a string attached to a wall is given to explain waves and the ressonance frequencies, the length of the string ...
1
vote
1answer
50 views

Calculate the length of the string if it is vibrating at the 4th harmonic [closed]

The statement is as follows: The function that describes a standing wave on a fixed string at both ends is given by $y(x, t) = 2A \sin (kx) \cos (\omega t)$, where $A = 1.5\ \mathrm{cm}$, $k = 0.3\ ...
0
votes
1answer
32 views

Derivation of acceleration and tension of pulley system [closed]

On this website I am considering the question that goes along with figure 30. I am going to assume downwards is negative and rightwards is positive (not to confuse upwards as the website says). The ...
0
votes
1answer
52 views

Does the rope stretch when the pulley of Atwood's machine is accelerated?

Let's say I've an Atwood's machine in which I have two point masses which are different. Now, when I accelerate the pulley, the two masses accelerate at a different rate which can be shown by ...
0
votes
4answers
51 views

Tension at extreme of a rotating rope of mass $m$

A uniform rope of mass per unit length $\lambda$, length $\ell$ is attached to shaft that is rotating at constant angular velocity $\omega$. Find the tension in the rope as a function of distance ...
0
votes
1answer
46 views

Gravitational force on a rope

If we have a rope fixed to the ceiling. How much gravitational force will the rope experience? Let's suppose the mass is $m$. Well the obvious answer is $mg$. But doesn't the part that is ...
0
votes
0answers
16 views

Is the Euler-Eytelwein equation also applicable for sliding friction?

Is the Euler-Eytelwein equation also applicable for sliding friction? Does this hold true if you just replace the coefficient of static friction with the one of sliding friction? I'm working on a ...
1
vote
2answers
75 views

How does the thickness of a string affect the frequency?

I've notice that thicker strings have lower frequencies, but is there a specific relationship between theses two?
3
votes
1answer
62 views

Why a rope grabbed by a single end seems to follow the hand that grabs it?

Context I am thinking about the physics of the movement of a rope in the context of a person running and grabbing a rope in one hand (the other end is "free", there is nothing attached). When the ...
1
vote
3answers
378 views

Still Confused about Linear Momentum in a Circle

A point mass with mass $m$, distance $r$ from circle and constant tangential velocity and constant angular velocity is swung around a circle. ($p$ is linear momentum) Angular momentum is radius x ...
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votes
1answer
38 views

No standing wave at high tension [closed]

Why transverse standing wave in a string is finished when there is a very high tension in string .......I don't know the reason if tension increases speed then why there is no wave
1
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0answers
34 views

Two spheres are connected by taut string; the mid-point is pulled with constant power; how fast do they collide? [closed]

Two small spheres, each of mass m, lie on a smooth table, connected by a taut inelastic string of length 2l. The mid-point of the string is pulled with constant power P, along the table, perpendicular ...
3
votes
3answers
2k views

If strings are solid, why don't they have longitudinal waves? [closed]

A string is a solid but it does not show longitudinal waves. Well it is known that a string cannot be compressed but only be given tension but a answer with a sound scientific reasoning will be ...
1
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0answers
32 views

What is the equation for a convex catenoid, and is it subject to an oscillation on minimum surface?

I want to re-think the shape of a vibrating string to find a source for frequencies that are not emitted by the fundamental mode but do not require points that are fixed and moving at the same time, ...
0
votes
2answers
37 views

What's the total energy when I tie a mass with a string and then rotate it in a radius $r$ with angular velocity $\omega$?

I know it may be a very silly question. But when we are calculating the total energy, shouldn't we also consider the potential energy due to the centrifugal force acting on the body? Or as, we are ...
1
vote
0answers
65 views

Why do musicians stretch the strings of their string instruments? [closed]

I came across this simple problem:´ A violin string has a density of $\rho=4.0\times 10^{-4}\space Kg\space m^{-1}$ and a length $L=0.33m$, and we want it to vibrate at a frequency $f=660Hz$, what ...
1
vote
5answers
162 views

Pulley string system using conservation of string length method

my attempt $$4(x_3-c_1)+x_p=L$$ which give $4*a_3=-a_p$ such that $a_p$ acceleration of pulley how to get relation between $a_1$ and $a_2$ and $a_3$ using conversion of string and how to solve the ...
1
vote
2answers
74 views

At what frequency does a string vibrate?

When a string with fixed ends vibrates (e.g. plucking a guitar string) Fourier Theorem says that the vibration can be expressed as a sum of its normal modes, which are sinusoidal vibrations with ...
0
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2answers
45 views

Does a string vibrating with hard boundaries contain harmonics of the fundamental frequency?

When the string of a violin is plucked, the resulting sound contains harmonics of the fundamental frequency. Is this an inherent property of a string with hard boundaries vibrating? Does an ideal ...
3
votes
2answers
46 views

Reason for neglecting frictional force in a particular type of Motion

A thin inelastic string is tightly wound on a cylinder. One of the ends of the string is attached to the above surface. Initially the whole system (string +cylinder) is held near the surface. When it ...
0
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0answers
40 views

Tug of War force of tension [duplicate]

There are two people pulling on a rope at both 400 N equally. What is the force of tension on the rope. They are equally centered from each other? I said the tension of the rope is 400 N, because ...
0
votes
1answer
29 views

Damped mechanical wave

a string with density $\rho$ and tension $T$ is bound at it's two ends at $x=0$ and $x=L$. there is a force acting on the string proportional to the velocity $F(x,t)= -2\gamma \rho \dot \psi(x,t)$ ...
1
vote
1answer
32 views

Is the maximum ability of a rope to withstand the tension force constant?

Suppose, I have a rope which has a length of 10 meters. I know that it can handle up to 100 N centrifugal force in circular velocity condition. Then I attached a 10 gram spherical object to the end of ...
2
votes
1answer
39 views

Guitar strings struck out of phase

Do guitar strings struck out of phase with one another force each other to begin vibrating in phase with one another? I ask because wouldn’t chords sound more dissonant from time to time if this did ...
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votes
3answers
62 views

Trouble with tension

Two persons A & B are pulling the two ends of a rope (As people do in tug war).Person A pulls rope with a force=10N and the person B is pulling another end of the rope with a force =20N. According ...
0
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1answer
39 views

Rotational motion

Today I was thinking a bit myself about circular motion and I come up with a doubt. Suppose we tie a string with a bob and then fix other end of the string with a support. Suppose the string is ...
0
votes
1answer
84 views

Why is the tension in a pendulum string highest when it is at the mean position?

Why does the string of a pendulum have max tension when it is at the mean position?
1
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1answer
43 views

Are These Guitar Strings Demonstrating Subharmonics?

This video has a fair few instances where there is an exaggerated wiggling of the guitar strings. I rationalise this by saying its a similar effect to rotoscoping, like where wheels appear to spin ...
1
vote
2answers
63 views

How does a temperature change affect the pitch of the fundamental frequency produced by vibrating string? [duplicate]

The vibrating string is tightened using tuning keys of the guitar. Assuming the amount of tightening is constant, what will change in string (mass? tension? linear density?) when a temperature change ...
-1
votes
2answers
72 views

Three boxes and a pulley. Why is the tension calculated differently?

Three boxes A, B and C are connected by a wire. Boxes B and C are on a table. Box A is suspended across a pulley. Assume no friction and that the mass of the wire is negligible. Diagram: ...
1
vote
4answers
121 views

Conceptual help with a modified atwood machine

From my understanding, in this atwood machine, one mass is on a horizontal surface, and the other is hung off a pulley and left to freefall. Pictured below: If only the hanging mass affects the ...
0
votes
3answers
91 views

Tension in a stone, string system undergoing uniform circular motion [duplicate]

I've recently read that a string can be assumed to be a spring with a really high spring constant, and it applies a force in the opposite direction to the force being applied Like in this case, ...
0
votes
1answer
59 views

2 Pully Atwood Machine [closed]

I'm helping a friend with a few problems from his algebra based physics class and am stumped on this one. The pulleys are frictionless and massless. The right side of the m1 string is fixed. It ...
0
votes
1answer
34 views

Can't Seem To Understand This Tension Problem [closed]

I found this problem online while practicing and the answer is supposed to be D. I tried using the answer to solve for $T$ and I got $T=\frac{gm_1m_2}{m_1+m_2}$. The numerator is what's really ...
1
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2answers
37 views

Why is the entirity of string tension $T$ included in the potential energy of a string wave?

When calculating the elastic potential energy of a string segment inside a transversal string-wave, it is usually reasoned that the string tension $T$ causes the string segment to stretch as it ...
0
votes
4answers
71 views

Applying Newton's Laws in a Circular Motion

A child ties a rock to a rope and turns it around describing a circle. horizontal. My Classical Physics teacher has told me that the string cannot be perfectly horizontal, but I don't know why. I ...
1
vote
2answers
41 views

Different weights for time and spatial derivative in Lagrangian Density

I'm new to QFT and trying to understand the form of the Lagrangian densitys used. As a simple model you often see a Lagrangian density of the form $${\mathcal L} = \frac{1}{2} \partial_j \phi_n \...