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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.

0
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2answers
36 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
21 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 ...
-1
votes
2answers
34 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, ...
-4
votes
1answer
37 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?
-2
votes
0answers
17 views

İmpulse of tension during swinging [closed]

A mass m connected to a rope which is fixed to ceiling is released from horizantal. Find the impulse applied by the tension till the mass comes to horizantal.
47
votes
4answers
13k 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. ...
-1
votes
0answers
50 views

Dynamic question [closed]

In a welcome triumph of technology, Canada shoots its three federal party leaders far into space.Scheeridan, TrustDuh, and SingASong have identical masses of 80.0 kg and they are tied together with ...
1
vote
4answers
495 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
53 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) ...
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votes
1answer
47 views

Confusion on transverse vs longitudinal waves on strings and planes

Background: https://en.wikipedia.org/wiki/Longitudinal_wave 'Longitudinal waves are waves in which the displacement of the medium is in the same direction as, or the opposite direction to, the ...
2
votes
2answers
36 views

Why do we need to include impulse by string?

There is this paragraph in the solution of the question : Since ball A is suspended by an inextensible string, therefore, just after collision, it can move along horizontal direction only. Hence, a ...
-1
votes
0answers
181 views

A rope is hanging between two poles find this [duplicate]

Two poles of $50\ \text{m}$ height are apart via $80\ \text{m}$ rope between them if the rope is hanging and $20\ \text{m}$ above the ground. What's the distance between the two poles? My attempt: i ...
1
vote
1answer
46 views

Guitar string - feedback from the body

This is a question about the frequencies that remain on the string during the decay of vibrations. As I understand it decay occurs because of the: a- Internal damping of the string. This is due to ...
0
votes
3answers
76 views

Why this incident happens? [closed]

If there's a rope which two sides are attached to the wall and a rigid body is hanged down from the rope (that body has light mass )in a such situation if a force is applied on the rope at any point ...
0
votes
1answer
38 views

Need help in calculating the pull on string in kgs when moving weight on horizontal bar

need your help. I realized today, if you do not practice it becomes hard to understand simple concepts even you were once a science student :( I have attached a picture to help make the problem ...
2
votes
2answers
67 views

Does a vibrating string produce changes in tension in the string?

A taut string anchored at both ends increases in tension as the string is displaced to a side. When released the string will vibrate at whatever frequency to which the system is tuned. If this were ...
1
vote
2answers
89 views

Vibration of strings [duplicate]

What happens if we clamp a string at both it's ends and pluck it at different distances from one of the ends? Will the frequency of oscillation be the same or will it differ based on the place from ...
1
vote
2answers
125 views

Why a short rope takes more load than a longer rope?

The captain of a ship told me that it should be avoided to put a long rope next to a short one because the short rope takes most of the load and the long becomes relatively inactive, although both ...
10
votes
3answers
655 views

What is fundamental frequency, how does it make sense?

I’m currently going through harmonics, and I do not at all understand the fundamental frequency. I understand that it is the simplest vibration of a string, but I don't understand how can it have ...
0
votes
3answers
79 views

Atwood's machines: acceleration of massless pulley [duplicate]

I have a question regarding Atwood's machines. Consider the following machine and text accompanying it: The tension in the short string connected to $m_1$ is $2T$ because there must be zero net ...
7
votes
5answers
925 views

Does plucking a guitar string create a standing wave?

About two weeks ago there was a mock test in Korea, and a physics question asked if a plucked guitar (it was actually a gayageum, a traditional instrument, but I'll just call it a guitar for ...
-3
votes
1answer
62 views

If $M=2.0kg$, what is the tension in string 1 on the picture below? [closed]

Attempt: T1+T2+F=0 F=mg=2.0kg*9.8=19.6N T1x=-T T1y=0 T2x=Tcos60 T2y=Tsin60 sum of x components must=0 -T1+T2cos60+Fcos(theta)=0 sum of y components must=0 Tsin60-Fsin(theta)=0 Not sure what to ...
1
vote
0answers
26 views

Waves on a slack string

hello im doing an experiment on waves and i need to know how to calculate the wavespeed of a wave in a circular slack string hanging from a pulley. Is there an equation for this? Is there tension in ...
2
votes
1answer
40 views

Pulling apart an ideal string that is equally strong in all points

I have a finite length string that is equally strong in each point. The strength is finite. I slowly start to pull it apart by both sides. In which point(s) will this string snap? Will it extend ...
1
vote
1answer
37 views

Relation between string wave and sound wave

What is the connection between an equation representing a string's movement, and the equation representing the sound wave produced by that string? For example: What can I learn about the sound wave ...
1
vote
0answers
52 views

Capstan equation with only one end of rope under tension

The capstan equation will give me the relation between the tension force at both sides of a rope wrapped around a cylindrical object, but what happens in this situation where the 'rope' is something ...
2
votes
2answers
84 views

Reason for body attached to a string being in free fall?

This is a question I found in a book: A string is wrapped around a uniform cylinder as shown in diagram. When cylinder is released string unwraps without any slipping and the cylinder comes down. ...
-1
votes
2answers
133 views

Speed of a transverse wave in a string

For the speed of a transverse wave in a string we use the formula $$v= \sqrt{\frac Tμ } $$ and sometimes we use the formula $v =λf$. Are these two same or different?
1
vote
0answers
27 views

Is using an IMU suitable for measuring the vibrations of the string?

I want to measure the vibrations of the guitar string. I've got an IMU sensor. I want to mount it on a string and measure the vibrations of the element. IMU: Sparkfun ITG3200 I'm not pretty sure is ...
0
votes
0answers
29 views

How is the phase velocity for a wave in a stringed instrument derived?

I was searching on the internet for a formula relating velocity of wave and force of tension of a string (eg how the tension in a string instrument effects the velocity) and this formula keeps ...
0
votes
1answer
66 views

Tension in a wire

I found this image on one of the answers I was going through. In this picture since the man balances himself in the middle of the rope, there's equal tension throughout it. However if he would have ...
5
votes
2answers
361 views

What is the equation for a string fixed at both ends without simplifying assumptions?

The book Mathematical Physics by Eugene Butkov has, on Chapter 8, the equation for a held string (by held I mean with endpoints fixed and both at the same height) as being $$T\frac{\partial^2 u}{\...
0
votes
4answers
81 views

Why do we not care about force from the string on a pendulum or the normal force when skating down a ramp?

Regarding potential and kinetic energy, when a pendulum swings we do not count the force from the string because it doesn't affect the energy, but why? if we split the force from the string to it's ...
1
vote
4answers
83 views

Active and passive pulling - is there a physical difference?

Let's suppose we have two people Alice and Bob in a vacuum. The are connected by a rope. At first, Alice pulls Bob with force $F$ and Bob only clings to the rope. Afterwards, the experiment is ...
0
votes
1answer
40 views

Finding the tension in a pulley system

Can anyone please help me with the following problem? Each of the weights A and B has a mass M and C has a mass of kM. A) If the system is released form rest find the acceleration of the moveable ...
1
vote
0answers
28 views

Mode Expansions of World-Sheet Fermion Fields

Recently I'm studying superstrings by the Book written by B & B & S. I have a quick problem about the mode expansions of world-sheet supersymmetric fermion fields in Chapter 4. The mode ...
0
votes
3answers
74 views

How do I solve this block-string system problem?

This was a problem in an examination paper that I was solving: Three blocks of masses $m_1$, $m_2$ and $m_3$ are connected to a massless string on a frictionless table as shown in the figure. They ...
2
votes
1answer
28 views

In Atwood machine, does the tension of the rope do work?

It seems in all Atwood machine exercises I can find, no one ever takes into account the tension of the rope when solving with conservation of energy. Why is this? Shouldn't the tension be a non-...
1
vote
1answer
90 views

Propagation of wave on a stretched string

I'd like to describe a scenario in which a wave pulse propagates on a string. Consider a long string with one end fixed to a wall and the other held by a person. Suppose the person snaps his hand a ...
1
vote
0answers
82 views

200 Puzzling Physics Problems P48 [closed]

Here is the question: Two small identical smooth blocks $A$ and $B$ are free to slide on a frozen lake. They are joined together by a light elastic rope of length $L \sqrt(2)$ which has the property ...
-1
votes
1answer
50 views

Intro physic question - Tension [closed]

A heavy bird sits on a clothesline. Will the tension in the clothesline be affected by the sag in the line? Use parallelograms in your explanation. What are the minimum and maximum tensions possible? ...
0
votes
1answer
32 views

Discontinuity in Fourier sine series for vibrating string

In physics class we learned that any string vibration with two fixed endpoints can be written as a superposition of normal modes, where the shape of each normal mode is given by $y(x)=A_n\sin(nx)$. As ...
-1
votes
1answer
159 views

Tension and Newton's Third Law [duplicate]

I have heard many people tell me that the tensional force is bi-directional. Consider the following case where a (mass-less) rope is used to transmit tension. The rope is being pulled (by hand) with ...
0
votes
2answers
37 views

Pulley system, what is the ratio?

I've got this pulley system and I am not sure what the ratio is, that is if I pull the rope at S for example 10 cm how much will the block move? My guess is 10cm pull = $\frac{10}{4}$ cm at the block, ...
2
votes
1answer
69 views

Is a Kerr ring singularity a closed string?

I’m obviously not a scientist, but has anyone considered that a Kerr ring singularity might basically be a closed string? The singularity spins in one direction only and is incredibly flat and thin (...
0
votes
1answer
21 views

Normal velocity direction

Lets say i have an object attached to rope and it starts spinning in a way that rotation happens in $x,y$ plane consider $y=0$ being ground level. It has tangent velocity of $v_0$. Now how large $v_0$ ...
4
votes
3answers
167 views

Why are strings of different thicknesses and materials used in a sitar or a violin?

Why are strings of different thicknesses and materials used in a sitar or a violin? I guessed that to produce different frequency, different thicknesses and materials are used. Is this correct?
0
votes
1answer
65 views

Total mass of system and Force

In physics class we did an experiment where we pulled a trolley (with weights) with a mass to show $F=ma$. The mass was dangling off the table and thus the force of acceleration was gravity. The ...
0
votes
0answers
58 views

How do you change the acceleration of a tennis ball, connected to a string in circular motion?

I'm a freshman in high school. In Physics we have a question in our lab that I would like to have help on. In the lab, we have a flying pig (or tennis ball) tied up to a string that's connected to the ...
0
votes
1answer
46 views

The dangling chain - help with derivation

I am trying to understand the derivation of the normal modes of a dangling chain given here[pdf]. The author considers a chain with density per-unit-length $\rho$ hanging from a fixed point and ...