All Questions
220
questions
0
votes
0
answers
26
views
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. ...
- 539
1
vote
1
answer
89
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 ...
- 539
0
votes
0
answers
19
views
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. ...
- 185
-1
votes
2
answers
77
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 ...
- 73
3
votes
2
answers
499
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 ...
- 69
1
vote
4
answers
670
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?
- 539
0
votes
3
answers
137
views
Why does an alpha particle traveling at the same speed as a beta particle have 'only' about twenty times the energy? Rather than over seven thousand? [closed]
An alpha particle travels at about half the speed as a beta particle, right? ~5% of light speed versus ~10%?
Therefore, if you doubled its velocity, its energy would roughly quadruple, correct? (Or ...
- 4,515
1
vote
2
answers
197
views
Equation for relative Kinetic energy
Relative Kinetic energy is given by
K.E = ($\gamma$-1)$m_0$c²; where $m_0$ is rest mass
but can it also be given by this
K.E= $\frac{1}{2}\gamma m_0v²$;
where v is velocity of particle
can it?
- 367
2
votes
8
answers
305
views
If matter is a form of energy, can it be converted into another form of energy?
I have been told that energy and mass are the same. What puzzles me is why don't we use the same units of measure for both if they are the same? The unit of mass is kg and the unit of energy is the ...
- 151
2
votes
3
answers
193
views
Energy and momentum & the relation between them
I am trying to wrap my head around energy, mass and momentum, especially in the more general scope of special relativity where massless objects moving at the speed of light also have momentum. So I am ...
- 213
0
votes
2
answers
71
views
Confusion in calculation of power [duplicate]
Question-
Sand is being dropped from a stationary dropper at a rate of 0.5 kg s$^{-1}$ on a conveyor belt moving with a velocity of 5 ms¹. The power needed to keep belt moving with the same velocity ...
- 252
0
votes
1
answer
30
views
Total energy "exertion" raising and lowering a weight
I'm thinking of the example of somebody raising and lowering some kind of weight, say a barbell and what effect the total time takes to perform the whole raising and lowering action would have on the ...
- 191
5
votes
3
answers
355
views
How is the energy content in 1 kg of water and petrol the same?
We know petrol is a fuel and water is not. But how come 1 kg of water and 1 kg of petrol have the same energy content? The total energy is given by $E=mc^2$, it says nothing about the chemical ...
- 179
0
votes
0
answers
36
views
Calculate Kinetic Energy of electron from effective mass?
The effective mass of an electron, due to special relativity, lower than the real mass. So I thought one can calculate from the mass ratio the velocity as it is dependent by a factor of $\sqrt{1-v^2/c^...
- 1
0
votes
1
answer
35
views
Massive equivalent of a photon and deduction of a photon's linear momentum
Since photons have an energy given by $E=h\nu$, we could define a particle whose rest mass is such that it has the same energy than the photon: $E=m_0c^2 \Longrightarrow m_0=\frac{h\nu}{c^2}$. We now ...
- 1,619