All Questions
7
questions
13
votes
11
answers
4k
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True or False: energy is conserved in all collisions [closed]
Using introductory physics, how would you answer this question? (I have a disagreement with my instructor and I’m curious to hear your input)
One of us says true because the question doesn’t specify “...
- 139
0
votes
2
answers
76
views
Is there a way to verify that energy of a body is directly proportional to mass, without using the definition?
How would I go about verifying that the energy a body possesses, is directly proportional to its mass to the first degree, without using the definition of work?
How could I show this fact without the ...
11
votes
3
answers
4k
views
Where does all the mass created from energy go?
So mass can be created from energy when small protons speed up, 430 times bigger to be exact. I don't know if this is a stupid question, but I'm in middle school so cut me some slack. Where does all ...
- 109
2
votes
4
answers
7k
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How is mass reduced in a normal chemical reaction which releases energy like heat, sound or light?
I was reading this link.
Just above the paragraph titled "OTHER CONSERVATION LAWS", it says that
"This conversion of mass to energy happens well below the speed of light, in a very small way, when ...
- 23
2
votes
1
answer
2k
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Does time travel violate conservation of mass/energy? [closed]
Imagine I exist at time $t_1$ and my mass is $m$. At time $t_2$ I time travel back to $t_1$. At time $t_1$ there is now a net increase of mass/energy in the universe by $m$.
At time $t_3 = t_2 - x$ ...
- 173
2
votes
3
answers
4k
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Conservation of mass energy and kinetic energy in different reference frames
With a little work it's easy to show that kinetic energy by itself is not necessarily preserved when switching between frames of reference. And it is my understanding that energy should be preserved ...
- 123
0
votes
2
answers
423
views
almost same mass, same distance, different energy needs
Imagine a car, driving 10 km at constant speed in 6th gear. There will be a measurable fuel consumption.
Now imagine the same car driving 10 km again at a constant speed (same as above) in the 1st ...
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