# 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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### Why is the center of mass of this system moving?

Here in this question , considering the system to be the thread , ladder and man , we can say that as the gravitational force which is and external force equal to 2Mg is acting in the downward ...
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### Interpretation of momentum in special relativity

Consider an inelastic collision between two particles $A$ and $B$ of the same mass $m$, such that after the collision they come to rest WRT an inertial frame K. In this frame, both the particles ...
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### Notion of mass of a quantum field theory in AdS space-time

Consider a scalar field theory in $AdS_{d+1}$ spacetime $$S= -\frac{1}{2}\int d^{d+1} x \sqrt{-g} (\partial_\mu \phi \partial_\nu \phi g^{\nu \mu} + m^2 \phi^2 )$$ On ...
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### Does the degree of freedom change with speed for massive particle?

There are 2 degrees of freedom for a photon. But how many are there for massive particles and will this change with speed?
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### Gravitational Force in a two hollow identical spheres? [closed]

Two identical hollow spheres of negligible thickness are placed in contact with each other. the force of gravitation between the spheres will be proportional to (r = radius of each sphere): R R² R⁴ R³...
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### Neutrino field is left-handed

Why if we take the mass of neutrino to be zero then we get only left-handed field when $\psi_r=\frac{1}{2}(1+\gamma^5)\psi$ and $\psi_l=\frac{1}{2}(1-\gamma^5)\psi$ has no dependence on mass?
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### Confusion regarding calculation of amount of water in container to ensure lowest centre of mass

When I tried to calculate the volume of water that should fill a massed container such that the centre of mass of the system is the lowest, I obtained two separate results when two different methods ...
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### which force should come out to be the same in both frames

Suppose that a long cart is moving at a constant relativistic speed with respect to the ground. Sand is falling on it from negligible height(from the same place and zero horizontal velocity with ...
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### How exactly can we shake an object to determine its mass?

It's often said that inertial mass is a measure of how hard it is to shake an object (as distinct from gravitational mass, which is how hard it is to lift an object in a gravitational field). Because ...
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### As a binary system start producing gravitational waves even before merge should the stars start losing mass while still orbiting each other?

As a binary system start producing gravitational waves even before merge should the stars start losing mass while still orbiting each other? But is this really difficult to understand as just orbiting ...
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### What's the minimum possible mass of a stable neutron star? [duplicate]

What's the minimum possible mass of a stable neutron star? Let's say you have a neutron star and slowly take away it's mass, e.g., either by firing a stream of anti-neutrons or by proton decay, since ...
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### Force of an accelerating ball? [duplicate]

By Newton's second law, we know that $F=ma$. If I were to drop a ball from some height, it would accelerate to the ground with gravitational acceleration. But if I were to drop the same ball from a ...
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### Do electrons have inertia?

I don't know quantum mechanics and know a little bit about mechanics and a very little bit about subatomic particles but I am just a curious to know the answer to my question. My question is if '...
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### What would be the value of $c$ where $c$ is the speed of light?

From the equation of $E=mc^2$, where $E$ is the energy, $m$ is the mass and $c$ is the speed of light, so from that we can get $c=\sqrt{Em}$, again from the equation of $\lambda=v/f$, where $\lambda$ ...