| Subject | Date Asked | Expert |
|
| Same value for all observers | 11/14/2009 | Uncle Ben |
Q: Einstein told us velocity of light is same for all of us and also the scientists proved that is ...
A: an experiment you probably already know about is actually the best experiment to answer your ...
|
| Attraction between objects | 11/12/2009 | Uncle Ben |
Q: I wonder how we do attract each other. In some books,it is said that we don't attract directly and ...
A: James, I see that you are interested in gravity. Newton said, when asked WHY objects attract each ...
|
| black holes | 11/9/2009 | Uncle Ben |
Q: What isa singularity?
A: Lenny, according to Einstein's General Theory of Relativity, there is a singularity at the center of ...
|
| Photon mass | 11/5/2009 | Uncle Ben |
Q: According to our current knowledge, nothing can go faster than the speed of light. Light is supposed ...
A: Tristan, light does not have any rest mass, but it does have energy and momentum. Light is ...
|
| time dilation,SR | 10/27/2009 | Uncle Ben |
Q: why does the presence of ship A affect the whole calculation? imagine that Earth is now 0 years ...
A: Sorry, I mis-read your problem statement. You are correct about the application of the velocity ...
|
| time dilation,SR | 10/27/2009 | Uncle Ben |
Q: why does the presence of ship A affect the whole calculation? imagine that Earth is now 0 years ...
A: Chris. The difficulty you are having is because you have not applied the velocity addition formula ...
|
| Space/time continuum | 10/17/2009 | Uncle Ben |
Q: I have an idea of physical existence that I want to clarify. I understand that space/time is viewed ...
A: Stephen, I think your question is one of philosophy, not physics. You say "We do not exist a second ...
|
| Time | 10/14/2009 | Uncle Ben |
Q: Uncle Ben, Is time moving faster on an earth satellite with respect to on earth because the ...
A: Paul, the answer is your third alternative. I do not know precisely how much each effect ...
|
| cosmology question | 10/13/2009 | Uncle Ben |
Q: Ben! I have a hard time wrapping my head around the shape/size/etc. of the universe. But let me ...
A: Bruce, think of a balloon being filled with air. On the surface of the balloon there is no edge, no ...
|
| cosmology question | 10/13/2009 | Uncle Ben |
Q: Ben! I have a hard time wrapping my head around the shape/size/etc. of the universe. But let me ...
A: Bruce, I think you have a misconception there. As the universe expands, the velocity of distant ...
|
| cosmology question | 10/13/2009 | Uncle Ben |
Q: Ben! I have a hard time wrapping my head around the shape/size/etc. of the universe. But let me ...
A: Bruce, everybody else has the same problem that you have getting your head around cosmology! I wont ...
|
| Orbit Time x ? | 10/3/2009 | Uncle Ben |
Q: Orbit Time x ? I am so excited about this question, For the sake of the question let's ...
A: first let me say I am sorry to be so late in responding to your question. I have had some email ...
|
| Time/light | 9/12/2009 | Uncle Ben |
Q: I do not believe that time is a entity in itself, but agree that it is like many other thing we ...
A: Chris, one way to look at your question is to apply what General Relativity (GR) predicts about the ...
|
| Time/light | 9/10/2009 | Uncle Ben |
Q: I do not believe that time is a entity in itself, but agree that it is like many other thing we ...
A: This is a tricky question, but the answer does not invalidate Einstein's work. In the presence of ...
|
| Hadron Collider | 9/9/2009 | Uncle Ben |
Q: Regarding the Hadron collider , and that the guys down there want to accelerate particles in one ...
A: Arthur, the term "impact" speed is not a technical term, but I think you mean the speed of one ...
|
| Time | 8/28/2009 | Uncle Ben |
Q: Just read, (I know relativity forbids faster then speed of light as mass increases with speed) ...
A: Rick, it is generally accepted as true that a twin speeding off towards another star and then ...
|
| Time | 8/24/2009 | Uncle Ben |
Q: Does time have a defined speed, not relative to any interaction? If you do not object could you ...
A: Yes, Jay, subject to a few comments. Newton thought "yes" without any qualifications. But Einstein ...
|
| observations of an event. | 7/30/2009 | Uncle Ben |
Q: My name is James Schendel. When I was in high school in the 70's, my physics teacher would always ...
A: James, I am pleased to try to answer your questions about relativity. 1. It is true that most of ...
|
| light clock at high speed | 7/29/2009 | Uncle Ben |
Q: Uncle Ben, I have seen a description of a theoretical light clock used to demonstrate that time ...
A: Paul, the way to analyze the light clock without getting oneself confused is to talk about "events" ...
|
| light clock at high speed | 7/28/2009 | Uncle Ben |
Q: Uncle Ben, I have seen a description of a theoretical light clock used to demonstrate that time ...
A: Paul, re-reading the question and my answer, I believe I assumed too quickly that I knew the setup ...
|
| mass | 7/11/2009 | Uncle Ben |
Q: According to relativity, when an object travels close to light speed, it's mass will increase and ...
A: Shameem! You say when the (relativistic) mass increases, the speed will have to decrease because of ...
|
| light | 7/9/2009 | Uncle Ben |
Q: If you're familiar with atomic and nuclear physics, tell me about how gravity get created from an ...
A: Shameem, you have a very heathy curiosity. Do you have access to any books on physics? You should ...
|
| Time | 7/9/2009 | Uncle Ben |
Q: Can you set me straight on something? I'm not convinced "time" actually exists. I know it's ...
A: Time and change! Clocks certainly change, but they do more than that. Like all words in any ...
|
| time | 7/8/2009 | Uncle Ben |
Q: When you travel faster close to the speed of light, how the time go slower? AnotherWhy can't one ...
A: False. These relativistic effects are parts of physics, not psychology. When we say the watch goes ...
|
| time | 7/7/2009 | Uncle Ben |
Q: When you travel faster close to the speed of light, how the time go slower? AnotherWhy can't one ...
A: Shameem! The "why" question is very tricky. When Isaac Newton discovered universal gravity, he said ...
|
| mass transformed into energy | 6/10/2009 | Uncle Ben |
Q: I do have a problem and sorry for annoyance. Well probably E=mc^2 can't be a truth on heavy ...
A: Mohammad, you don't have to apologize for asking me a question. I would not have joined AllExperts ...
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| E=mc^2 | 6/9/2009 | Uncle Ben |
Q: Ben I can't understand completely that E is the equal to the mass multipied by c^2(speed of light), ...
A: Mohammad. To get out some of the energy mc^2 represented by the mass m of an object, you have to ...
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