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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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2answers
25 views

Tension in atwood machine [on hold]

Pretend you have an Atwood machine with a frictionless pulley system. On one end you have a very very heavy mass and on the other end, you have a basically negligible mass such that the combination of ...
0
votes
1answer
34 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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2answers
35 views

Best way to use a pulley

Which is easiest way to pull a pulley? I have posted a diagram in which there are three cases. In all three cases force and mass of body are same and pulley is frictionless. My understanding is that ...
0
votes
0answers
16 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/ $s(x=0, t) = 0$ ...
1
vote
4answers
69 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
65 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
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1answer
46 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 ...
18
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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
93 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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votes
3answers
54 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
82 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 ...
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votes
1answer
54 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
33 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
36 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
136 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
81 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 = ...
0
votes
1answer
40 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
80 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
43 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
49 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
27 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
2answers
63 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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votes
1answer
84 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?
51
votes
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. ...
1
vote
4answers
539 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
56 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) ...
0
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1answer
62 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
45 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
vote
1answer
47 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
77 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
42 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
116 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
103 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 ...
2
votes
2answers
141 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
675 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
223 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
1k 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 ...
1
vote
0answers
30 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
41 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
38 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
72 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. ...
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votes
2answers
312 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
95 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
367 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
109 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
89 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 ...