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Questions tagged [mass]

The property of an object that determines how much it responds to a force in Newtonian mechanics, and how much it interacts with gravity in the Newtonian framework. Mass also refers to the intrinsic energy of a particle in particle physics. This tag does also cover effective mass.

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Problem with equation of thrust in a system of variable mass

The equation for force on a system of variable mass (e.g. a rocket thrust equation) is $$F=-u\frac{\mathrm{d}m}{\mathrm{d}t}$$ where $u$ is the velocity of the escaping gases with respect to the ...
AllGames YT's user avatar
2 votes
0 answers
38 views

ADM mass calculation for the BTZ black hole

Considering a non-rotating and non-charged 2+1 dimensional black hole, known as the BTZ black hole which obtained by adding a negative cosmological constant $\Lambda=-\frac{1}{l^2},l\ne0$ to the ...
Daniel Vainshtein's user avatar
-2 votes
0 answers
35 views

Black hole production via light speed [duplicate]

As a test particle with rest mass approaches $c$ relativistic mass increases to infinity, does this mean that the energy required to continue the acceleration will create a black hole (as time also ...
John Pryme's user avatar
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2 answers
66 views

Why do objects with greater length feel heavier - and how to calculate perceived weight?

Consider this situation: As part of some training, you are asked to pull an object that is 100 feet long, weighing approximately 218 pounds across a distance of 310 feet (fire hose across concrete if ...
Timothy Bomer's user avatar
5 votes
3 answers
153 views

How did Einstein figure out mass (and hence energy) bends spacetime?

I can understand that once I fix the velocity of light at $c$, there is a relative variation in space-time based on special relativity (inertial frame of reference). It's not clear to me how Einstein ...
iVenky's user avatar
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Can two objects of different mass experience the same air resistance? [duplicate]

This question is assuming that the objects have the same shape and size, but different masses. I know that all objects have the same gravitational acceleration on earth, which is about 9.8 m/s^2. ...
user386598's user avatar
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0 answers
21 views

Is it necessary for constant mass of system to use Newton's 2nd law? [duplicate]

Is it necessary for the mass of the system to be constant to use Newton's 2nd law (here the mass of the bodies in the system can change but the total mass of system can't)
Manish's user avatar
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Both charge and mass are intrinsic properties of matter. So for the existence of matter, should both mass and charge exist simultaneously? [duplicate]

Recently, I came across a book which stated that "Mass can exist without charge but Charge cannot exist without mass". Is this statement really correct? As if we look intrinsically in a ...
Kunal Prajapat's user avatar
1 vote
2 answers
52 views

Newton's laws on constant velocity [duplicate]

We know that Newton's second law tells us $F=ma+v\frac{dm}{dt}$ so, if a body has a constant velocity but a changing mass, then the equation tells us that the net force acting on the body is $F=v\frac{...
Avineet Mohapatra's user avatar
-3 votes
1 answer
99 views

$a=F/m$ is it possible? [duplicate]

We know that $F=ma$ from Newton's second law, after modifying it a bit we can write it as a=F/m here the problem arises as here the equation tells us that force is a function of acceleration but how ...
Manish's user avatar
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2 votes
1 answer
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Why do heavy bosons have less range?

Why is it that there's a precise relationship between the mass of a mediator particle and its range? Because mass shouldn't directly affect decay time, right?
Flamethrower's user avatar
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Conformal invariance and mass terms in QFT

We know that a physically sensible QFT must be renormalizable. If I understand correctly, when this happens, the theory has "asymptotic freedom" and is conformally invariant past some high ...
Davyz2's user avatar
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5 votes
4 answers
218 views

Philosophical Discussion of Newton's Second Law

I was thinking a bit more deeply about Newton's Second Law the other day, having obtained a copy of The Principia. Newton originally describes his Second Law as such: "The alteration of motion ...
V T Naveen Mugundh's user avatar
1 vote
1 answer
88 views

How do objects with more mass accelerate when pushed downward?

This is kind of a simple question. I was basing it off Newton's second law, $$F=ma$$ With the same applied force, an object with more mass will accelerate less. However, what if two objects of unequal ...
user386598's user avatar
5 votes
1 answer
128 views

Estimating particle mass from bubble chamber

In an example of a book, it shows how to estimate the $\pi^-$ rest mass 139MeV$/c^2$ from the trajectory of $\pi^-$ in a bubble chamber. It starts from the charge-to-mass ratio formula $$ \tag{1} \...
chichi's user avatar
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Connection between the metric tensor and mass

The general expression of a line element in a space with metric tensor $g_{\mu \nu}$ is $$ds = \sqrt{ g_{\mu \nu} dX^{\mu} dX^{\nu} }$$ If we consider a curve $X^{\mu}(\tau)$ parametrised by $\tau$, ...
pll04's user avatar
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How does mass-energy equivalence work with chemical bonds? [duplicate]

If you have, for instance, 2 oxygen atoms and do E=mc2 to get their equivalent energy, you get about 2.38nJ. However, if you have diatomic oxygen, there's also the energy of the bond; about 0.8aJ. ...
Flamethrower's user avatar
0 votes
4 answers
158 views

What does the $F$ in Newton's second law equation mean?

This is a super simple question: does $F$ represent the net force exerted on an object or the force it exerts on another object as a result of momentum? Say a ball is rolling. In this specific ...
user386598's user avatar
1 vote
3 answers
86 views

Relativistic mass of a closed system

Consider a Large Hadron Collider placed in space. Arrangements were made to collect the energy required to run the machine from starlight. Some proton particles are inserted inside it. When the ...
Akhtar's user avatar
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Mass of the Prototype $\rm kg$

With the new SI kg based upon Planck's constant $h$, is there any plan to eventually measure the former IPK using a Watt Balance, and determine how far its mass deviates from the new definition of 1 ...
RC_23's user avatar
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1 vote
2 answers
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Gravitational attraction between two bodies and gravitational accelaration [duplicate]

Since Newtons laws on gravity state that the gravitational attraction between two bodies is directly proportional to their masses and inversely proportional to the square of the distance between them, ...
Niranjan's user avatar
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Mass of my body from frame reference of fast moving particle [duplicate]

Suppose there is a particle that moves with near speed of light close to me. From the particle frame reference the particle itself is resting but my body moves with the near speed of light. So there ...
mirt's user avatar
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5 votes
1 answer
903 views

Higgs mechanism and mass gap in the Standard Model - asking for some clarification

Higgs mechanism is known to give "mass" to gauge bosons, especially in electroweak theory where the gauge group is given by $SU(2) \times U(1)$. However, as in this PE post or the statement ...
Keith's user avatar
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Understanding the Electron-Positron Transformation in Dirac's 2-Spinor Notation - Penrose

Penrose in his book, the road to reality, chapter 25, it says: non-standard way, by re-examining the Dirac equation in terms of the ‘2-spinor notation’, briefly introduced in §22.8. As remarked in §...
Julián Oviedo's user avatar
-1 votes
0 answers
48 views

How does mass/energy warp spacetime? [duplicate]

You often hear that gravity is not a " real" force like the electromagnetic force. Though most physicist think that to be consistent with quantum mechanics, gravity must have a field and a&...
Paul McCloud 's user avatar
0 votes
5 answers
207 views

Vacuum solutions in presence of mass?

Here is the page I will be referencing: Vacuum solution (general relativity) - Wikipedia My point is: if $T_{\mu\nu}=0$ implies that there is no mass, how can Schwarzschild vacuum be a solution, if ...
Elvis's user avatar
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-1 votes
2 answers
76 views

Rest Mass Energy

What exactly is the Rest mass energy? I know the usual goes Like it is total energy stored in mass $m$ that is in Rest. so for someone moving relative to the frame that the mass $m$ is in (a rest ...
Hello's user avatar
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0 votes
1 answer
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How does Diagonalizing Mass Terms Affect the Lagrangian?

One thing I don't get about mass diagonalization, is doesn't this also change the kinetic terms of your theory? You would get some off-diagonal kinetic terms. How do we deal with this? What also ...
SamuelFGC's user avatar
2 votes
0 answers
65 views

Will glass bottle survive being thrown into water? [closed]

Will this glass bottle survive, being thrown off a $15 \,\text{m}$ tall bridge onto water, assuming it will hit the water at the worst possible angle? The glass bottle is well built, has a size of $1 ...
stoldo's user avatar
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0 answers
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How exactly does Newton's second law work? [duplicate]

I had to do a reading on rollercoasters in class and it includes Newton's second law. Firstly, the reading states that acceleration depends on the magnitude of the force and the mass of the object, ...
user386598's user avatar
0 votes
1 answer
52 views

What does Density really mean? [duplicate]

We say that density is mass per unit volume and if an object has high density that means it has more amount of matter contained per unit volume but as we know mass is not the amount of matter ...
SHASHWAT RAI's user avatar
0 votes
2 answers
45 views

Confusion about acceleration when pulling a massively long object in space

I have this thought experiment that I just don't manage to solve. I'm sure there have been similar questions and answers, yet I haven't found any that explained it to me. I have no particular physics ...
Sreckcep's user avatar
3 votes
1 answer
65 views

How is the mass distributed in ordinary matter?

How is the mass distributed in ordinary matter? In the ordinary things around us, we know that most of the mass is in the cores of the atoms, the electrons around it contributing only a very small ...
Jos Bergervoet's user avatar
1 vote
0 answers
32 views

Contribution of gravitational energy to mass of spherical shell

Suppose we have a spherical shell of mass M. Suppose we are able to variate it's radius while maintaining the same mass. When two masses are subjected to attraction and are approached we may extract ...
George Kourtis's user avatar
3 votes
2 answers
497 views

Is the mass of curved space, additional mass?

According to Einstein, mass, say in the form of matter, curves space. It is the curvature of space that gives rise to gravity. Now I have heard there is an energy associated with the curvature of ...
John Hobson's user avatar
1 vote
4 answers
54 views

Question about relativistic mass and momentum transfer of Light

How can we reconcile the concept of inertia, typically associated with mass, with the behavior of light or electromagnetic waves, which lack classical mass but still exhibit resistance to changes in ...
Shantanu Binekar's user avatar
0 votes
0 answers
35 views

Why do we not consider the normal force on chain falling onto a table

I was solving a question which is as follows: A chain AB of length l is located in a smooth horizontal tube so that its fraction of length h hangs freely and touches the surface of the table with its ...
Jeff Jefferson 's user avatar
0 votes
0 answers
33 views

Can you explain the Georgi–Jarlskog mass relation?

I am trying to understand the Georgi Mass relation in $SU(5)$ As far as I was aware the symmetry breaking occurs only with the various charge quantum numbers (colour, weak charge, electromagnetic). So ...
bob's user avatar
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1 vote
0 answers
51 views

Why can't other bosons fluctuate up the potential curve and gain mass?

If a Higgs boson is able to gain mass by fluctuating up the Mexican hat potential, what stops other bosons from doing the same thing and gaining mass without the need of the Higgs mechanism?
thingthingthing123's user avatar
2 votes
1 answer
46 views

Investigating the stability of a wooden block

Consider the above experimental design. At the end of the strip, at point $p$, a mass $m$ is attached, the stability of the wooden block above is determined by the angle $θ$ at which the block topples ...
James Chadwick's user avatar
1 vote
4 answers
667 views

How does mass relate to kinetic energy?

I was working on homework and I had to list what kinetic energy depends on. Interestingly, it turns out it's also based on mass, not only speed. Does anyone have an explanation?
user386598's user avatar
0 votes
0 answers
16 views

Mass moment of inertia flipping in different mediums

Consider someone performing a front flip in the water versus in the air. Assume the body position in both cases to be identical. In which case would the mass moment of inertia be greater and why? Prof ...
user401506's user avatar
3 votes
0 answers
45 views

Why and How Gravitational mass of a body is affected by the presence of other bodies near it?

My textbook (Cengage Physics, 3rd ed, Mechanics-II, Pg-5.8) says that the gravitational mass of a body is affected by the presence of other bodies near it, whereas the inertial mass of a body remains ...
Peter swift's user avatar
0 votes
1 answer
46 views

Centre of mass and reduced mass in classical mechanic

Can we derive reduced mass from Cetre of mass equation if CM is not taken as origin? And Under what conditions can reduced mass concept be used or not?
Phyoe Kent's user avatar
1 vote
1 answer
103 views

Is it possible that the mass of a black hole is located at the event horizon?

Due to gravitational time dilation, an object falling into a black hole appears to slow down as it approaches the horizon, never actually reaching it. If it were to somehow enter the event horizon, ...
DexterJ Arnold's user avatar
0 votes
3 answers
68 views

How do mass and velocity relate to momentum? [duplicate]

So this is more of a clarifying question. A lot of online definitions state that momentum is a measure of how hard it is to stop or swerve an object, which makes sense. However, the formula for ...
user386598's user avatar
0 votes
1 answer
68 views

What does this equation for density mean?

What does this equation for density mean? $$\rho = \lim_{\Delta V\to\varepsilon^3} \ \frac{\Delta m}{\Delta V}$$
sebbbb's user avatar
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0 votes
7 answers
122 views

How does $m$ fit into the equation for weight?

I know part of the answer to this question because I know the equation, $W=mg$, and I know what $g$ signifies, which is the acceleration due to gravity. This acceleration is always the same on Earth ...
user386598's user avatar
0 votes
1 answer
38 views

Physics Principle of Balancing Board

Consider one of these Typically, it is well known that having you legs further apart helps you balance better, the wider the base, the easier it is to balance. I guess a body with a larger base area ...
Quin Gardiner Bax's user avatar
0 votes
1 answer
34 views

Newton's Second law for stacked blocks

I have a slight confusion regarding the application of Newton's 2nd law in a situation where there are two blocks, of mass $m_1$ and $m_2$, which are stacked on top of each other and placed on a ...
ethanolex's user avatar

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