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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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15 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 ...
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2answers
32 views

How to find velocity of colliding particles on string?

could anyone please help me with the following. I'm working through a mechanics book for my own interest but have found myself unable to see how to start this question. I don't request the answer just ...
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1answer
21 views

Function for Rope Tension [on hold]

A mass M hangs from a uniform rope of length L and mass m. Find an expression for the rope tension as a function of distance y measured downward from the top of the rope. I know that net force in ...
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0answers
14 views

A 25-kg box is pulled to the right on a rough, horizontal surface with a rope that makes an angle of 40 [closed]

(a) Draw a good FBD for the box. (b) What is the apparent weight of the box? (c) What is the magnitude of the friction force acting on the box? (d) What is the acceleration of the box?
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1answer
25 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 $F(x,t)= -2\gamma \rho \dot \psi(x,t)$ ...
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0answers
8 views

Length of string in case of pendulum is 1.0 m nd amp,itude is 30 what is velocity at lowest point [closed]

Length of strung in case of pendulum is 1.0 m nd amplitude is 30 what is velocity at lowest point
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1answer
31 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
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1answer
36 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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0answers
46 views

Inverted pendulum derived wheel [closed]

In this problem, pendulum is attached the edge of the wheel so I must use torque, the wheel can roll but cant slip and the rope cant coil up. I should use Lagrange mechanics, and after find the eom, ...
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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 ...
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1answer
38 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 ...
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1answer
28 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?
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1answer
42 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 ...
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0answers
26 views

Tension in a rope pulled equally on both sides [duplicate]

I would really appreciate it if someone can help me understand Newton's third law as it applies to the tension in a rope involved in a game of tug-of-war with 0 acceleration. Disregarding friction, ...
1
vote
2answers
42 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
62 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: ...
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4answers
48 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 ...
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votes
3answers
56 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
53 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
33 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
vote
2answers
32 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 ...
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0answers
17 views

How to equate the string tension of a racquet to coefficient of restitution?

I'm a tennis fan and wanted to see the relationship between the string tensions of the racquet and the velocity of the ball after it bounces off the racquet. I used the coefficient of restitution ...
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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 ...
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2answers
30 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 \...
1
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0answers
35 views

Newtonian Mechanics - Regarding Conservation of Momentum in Collisions

In the question, it is given that all three balls are identical and are connected by a massless, ideal string (on a horizontal plane), and initially, the ball at the centre is given a velocity $v$. If ...
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votes
1answer
37 views

Is the energy of a vibrating string the classical analog to Born's rule?

Consider this Phys.SE question which spells out the energy of a vibrating string as a variant of Hooke's law, and thereby explains why it's proportional to the square of the amplitude (here: the ...
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0answers
18 views

How does Melde's string behave at the limits of the string?

At the limits of melde's string of length $L$, the expression of the stationary sinusoidal signal $$s(x,t) = y_{0}sin(Kx+\psi)sin(\omega t + \phi)$$ has to verify two conditions : 1/ $s(x=0, t) = 0$ ...
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4answers
73 views

Possible to have a string that can bend but not twist?

I am looking for a string that can bend and flex easily but not twist. I want it to be able to snake through pipes, around bends, but not allow rotation of the thing at the end of the string. The ...
1
vote
4answers
70 views

Does $m$ in this problem refer to the total mass of the system or just the mass of a single body?

I am trying to figure something out in this problem: I am having trouble with these types of problems because often I don't understand which forces I need to consider when setting up $F=ma$. Here is ...
1
vote
1answer
79 views

Maxwell's wheel and friction

We experimented with the Maxwell's wheel today and at the end we were asked about why does this apparatus stop since there is conservation of energy. I did some research and apparently there is a type ...
19
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4answers
3k views

How are overtones produced by plucking a string?

I read the following from wikipedia: When a string is plucked normally, the ear tends to hear the fundamental frequency most prominently, but the overall sound is also colored by the presence ...
2
votes
1answer
135 views

According to newton's laws, why do the two different masses of an Atwood machine move in opposite directions?

Consider an Atwood machine with two different masses $M$ and $m$ such that $M > m$. When trying to find the acceleration of that system, all solutions I've found go like this: There are 2 forces ...
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3answers
64 views

Force without acceleration?

Suppose we have a metal block tied to a rope at a certain height and below it is a magnet,after some time we bring another magnet ,the rope doesn't break but was there more force applied on the metal ...
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votes
2answers
89 views

Oscillation of elastic rope hanging from the ceiling

I have to explore the problem of oscillations of an elastic rope hanging from the ceiling, which can move both in vertical and horizontal direction. I'm planing to solve this using a finite ...
-1
votes
1answer
120 views

Tension in pendulum [closed]

I am asked to calculate the tension in the rope of a pendulum at (a) its initial position as well as at (b) its lowest position. $L = 3 m$ $α = 10^o$ $mass = 2kg$ (a) For the intial point I used ...
0
votes
2answers
40 views

How can the same tension pull both the mass and the pulley?

So I have this problem: and I've drawn free-body-diagrams of pulley b and mass 2 I couldn't help but notice that the tension ...
0
votes
1answer
54 views

Inertia when pulling on a rope [duplicate]

Imagine a fragile cord attached to a ceiling with its other side attached to a sphere. On the lower part another cord is atrached to the sphere. Now visualize you pull STRAIGHT downward on this cord. ...
3
votes
1answer
191 views

Why is tension in a rope the same at every point?

So, I had this lecture where it was explained that if the pulley is friction-less, then the tension on any point of the rope is going to be same. I can understand the friction-less part, as pulley is ...
0
votes
1answer
84 views

Tension of a string on a rotating sphere and under the influence of gravity [duplicate]

I was studying about circular motion and found a topic that is apparent weight and found an equation of apparent value of g. But I can't understand why this is written
0
votes
2answers
83 views

Tension of the rope, error in the book's solution? [closed]

I'm stuck on getting the solutions the professor gave us for this problem. First of all the figure: He asks us for the maximum tension $T$ of the rope between $m_!$ and $m_2$. His solution: $$T = ...
1
vote
1answer
50 views

Virtual work - Tension in a string

I am confused about the way Tension or Thrust is used in equation of virtual work. I mean whether to use $ T\cdot dr$ or $-T\cdot dr$ (work done by tension). For instance in the below case : A ...
1
vote
1answer
134 views

Simple harmonic motion with pulley with mass

The problem is presented in the following diagram I'm refreshing things I've already learnt and I know I have some major gaps but I've searched and haven't managed to find a similar problem. The axis ...
0
votes
1answer
46 views

Need help explaining results of a frequency/temperature experiment for a ukuele

I recently performed an experiment for school which involved plucking different strings on a ukulele at different temperatures and measuring the frequency of sound produced. I expected to find a ...
1
vote
2answers
55 views

Velocity of a ring tied to an inextensible rope

In the diagram, the pulley is weightless and friction less and the thread connecting the pulley with the ring is inextensible. The thread is attached to the ring which in turn can move only ...
0
votes
1answer
30 views

Real Time Tension Measurement of a string

For a cable-stayed bridge, I have come across some papers where it is mentioned that the tension is varying in real time. I was just wondering why the cable tension is changed? (All the derivations I ...
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votes
1answer
82 views

Maximum tension in a rope [duplicate]

Lets say I have a siccative object that’s attached to a rope and it’s moving in a vertical circular motion around some circumcenter. If along the motion the rope will happen to reach maximum tension, ...
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1answer
135 views

Maximum force in tug of war

In tug of war, The maximum force that a person can exert on the rope depends on the static coefficient of friction. Is that correct?
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4answers
14k views

Why is the shape of a hanging chain not a “V”?

From Wikipedia: To answer this question: "What is the shape of a chain suspended at both ends?" we can use the variational principle that the shape must minimize the gravitational potential energy. ...
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vote
4answers
558 views

does tension in the string affect its equilibrium?

In my textbook (Sears and Zemansky's University Physics), it is written that the vector sum of the forces on the rope is zero, however the tension is 50 N. Then is tension different than the force? ...
2
votes
1answer
61 views

Non-standing waves on string

My problem is the following: Assuming, we have a string (homogeneous, no energy loss), with a given propagation speed: $c$. Let the origin (the source) of wave at $x=0$, thus the incident (direct) ...