A question about time travel (theoretical physics)...

A question about time travel (theoretical physics)...
by

1 Answer

Answer :

answer:See, but I have always wondered if we could only travel into the future, based on laws of conservation of energy. Think about it this way, if you travel into the past, are you not then duplicating the mass present in your body/clothing/gear to the existing mass of the universe at that point in the past? It would seem to me that going to the past would not be possible because you would be “creating” energy. Going to the future, on the other hand, could be possible since the mass represented by your body/clothing/gear would be removed from the current stream. It’s not duplicating mass within the universe. You’ve just temporarily taken it to the “side” and then you are going to deposit it at some point in the future. Do we have any theoretical physicists on this site?
by

Related questions

Is theoretical physics stuck in a rut?

Description : Is theoretical physics stuck in a rut?

Last Answer : answer:I'd say that we are in a period of relative stagnation. Part of it has to do with the fact that most other nations don't have the resources (labs, education, super-geniuses ) and the one ... knowledge is possible, but without the will to learn, we don't have even a chance of obtaining it.

What does it mean to have a theory in theoretical physics?

Description : What does it mean to have a theory in theoretical physics?

Last Answer : answer:A theory is a (tentative) description of known phenomena which makes further, verifiable predictions of phenomena. These predictions are tested and they too are supportewd by the evidence. Without the ... string hypothesis or string I'm-not-crazy-no-seriously-just-listen-for-a-minute .

Planck's constant was first introduced in order to obtain a correct theoretical prediction of: w) the distribution of frequencies occurring in black body radiation. x) the energy produced by the transformation of mass into energy. y) the speed of light. z) lifetime of the neutron.

Description : Planck's constant was first introduced in order to obtain a correct theoretical prediction of: w) the distribution of frequencies occurring in black body radiation. x) the energy produced by the transformation of mass into energy. y) the speed of light. z) lifetime of the neutron.

Last Answer : ANSWER: W -- THE DISTRIBUTION OF FREQUENCIES OCCURRING IN BLACK BODY RADIATION

What is the theoretical limit of the efficiency of a single-crystal single-junction cell in a photovoltaic system? w) 9 percent x) 29 percent y) 79 percent z) 99 percent

Description : What is the theoretical limit of the efficiency of a single-crystal single-junction cell in a photovoltaic system? w) 9 percent x) 29 percent y) 79 percent z) 99 percent

Last Answer : ANSWER: X -- 29 PERCENT

Name the German theoretical physicist who was awarded the Nobel prize for his principle of radiation which states that radiant energy is composed of tiny bits of energy called quanta, the magnitude of which can be calculated by multiplying the frequency of the radiation times a universal constant?

Description : Name the German theoretical physicist who was awarded the Nobel prize for his principle of radiation which states that radiant energy is composed of tiny bits of energy called quanta, the magnitude of which can be calculated by multiplying the frequency of the radiation times a universal constant? 

Last Answer : ANSWER: (MAX) PLANCK

Physics homework question about waves.

Description : Physics homework question about waves.

Last Answer : Frequency times wavelength equals speed. So frequency divided by speed equals wavelength. (Don't know if this helps but I thought I'd take a crack at it. Info here is from The Wonders of ... . A deluxe Golden Book, text by Irving Adler, copyright 1966 by Western Publishing Company, New York.)

Complex-ish physics/maths question on the speed a car would need to take to go around a loop.

Description : Complex-ish physics/maths question on the speed a car would need to take to go around a loop.

Last Answer : answer:The acceleration of circular motion is ( v ^2 / r ) where v = speed and r = radius of track. Because the track is vertical, the acceleration at the top must exceed the ... than gravity is pulling downward. From the viewpoint of the driver, centrifugal force at the apex exceeds gravity.

Theoretical Groundhog Day (movie) question. Could there be more than one person suffering like Bill Murray did?

Description : Theoretical Groundhog Day (movie) question. Could there be more than one person suffering like Bill Murray did?

Last Answer : These are unknowns. However, there is another story much like it. Check out the series Russian Doll

Theoretical question involving relativity. Faster than light!

Description : Theoretical question involving relativity. Faster than light!

Last Answer : answer:Wouldn't work. You would need infinite energy to accelerate the disk. Now, say you have a searchlight and you swivel it very fast (in outer space). The boundary of the search beam millions of ... will indeed move faster than the speed of light. But the individual photons in the beam won't.

4. You are given kerosene, turpentine and water. In which of these does the light travel fastest? Use the information given in Table. -Physics-10

Description : 4. You are given kerosene, turpentine and water. In which of these does the light travel fastest? Use the information given in Table. -Physics-10

Last Answer : Light travel faster in water as compared to kerosene & turpentine as the refractive index of water is lower than that of kerosene and turpentine. The speed of light is inversely proportional to the refractive index.

Why is time frozen from light's perspective? -Physics

Description : Why is time frozen from light's perspective? -Physics

Last Answer : Time is not frozen from light's perspective, because light does not have a perspective. There is no valid reference frame in which light is at rest. This statement is not a minor issue that can ... that actually exist, light travels through space and time in a normal way just like any other object.

Does time go faster at the top of a building compared to the bottom? -Physics

Description : Does time go faster at the top of a building compared to the bottom? -Physics

Last Answer : Yes, time goes faster the farther away you are from the earth's surface compared to the time on the surface of the earth. This effect is known as "gravitational time dilation". It is ... difference can be measured on the scale of meters using atomic clocks. Public Domain Image, source: NASA.

Which of the following is NOT one of the fundamental quantities in physics? w) time x) length y) weight z) mass

Description : Which of the following is NOT one of the fundamental quantities in physics? w) time x) length y) weight z) mass

Last Answer : ANSWER: Y -- WEIGHT

What is the theoretical bare minimum amount of time required to write a novel?

Description : What is the theoretical bare minimum amount of time required to write a novel?

Last Answer : It depends on how fast you can type. At 140 wpm, you could write a novel in about 5 hours.

Detention period of a settling tank is (A) Average theoretical time required for water to flow through the tank (B) Time required for flow of water to fill the tank fully (C) Average time for which water is retained in tank (D) All the above

Description : Detention period of a settling tank is  (A) Average theoretical time required for water to flow through the tank  (B) Time required for flow of water to fill the tank fully  (C) Average time for which water is retained in tank  (D) All the above

Last Answer : (D) All the above

Which of the following refers to use of more than one theoretical position in interpreting data? a. Data Triangulation b. Time Triangulation c. Method Triangulation d. Theory Triangulation

Description : Which of the following refers to use of more than one theoretical position in interpreting data? a. Data Triangulation b. Time Triangulation c. Method Triangulation d. Theory Triangulation

Last Answer : d. Theory Triangulation

What are some basic interesting topics of physics ?

Description : What are some basic interesting topics of physics ?

Last Answer : Some basic but interesting topics in physics include: Force and motion: This topic covers the basic laws of motion, such as Newton's laws, and how they apply to objects in motion. Energy and ... dives into any of these topics can lead to a deeper understanding of physics and the world around us.

Is there someone here at Fluther who is a professor of Physics?

Description : Is there someone here at Fluther who is a professor of Physics?

Last Answer : There was a guy here, maybe 3–4 years ago, with the Fluther name of AlbertEinstein. I haven’t seen him a whole, and I doubt it was the real one.

Are you ready for new physics?

Description : Are you ready for new physics?

Last Answer : Yes, have been for a while.

What kind of physics does a police officer need for investigating car accidents?

Description : What kind of physics does a police officer need for investigating car accidents?

Last Answer : K=½mv² is about as complex as it gets for either. Physics isn’t the hard part about forensics though.

Book on logic and its interconnectedness with physics?

Description : Book on logic and its interconnectedness with physics?

Last Answer : If in an alternate universe the speed of light was different from ours, their laws of physics would be different, but likely would be analogous.

Using your physics and math skills what is your estimate for Clifford the Big Red Dog's weight?

Description : Using your physics and math skills what is your estimate for Clifford the Big Red Dog's weight?

Last Answer : OMG! I love Clifford! I’ll say he weighs about 18,000 pounds, because I think maybe he is even bigger than an elephant. I don’t know if dogs generally have a higher muscle to fat ratio than an elephant? That might make a difference.

Is the University of Arizona known for it's physics programs?

Description : Is the University of Arizona known for it's physics programs?

Last Answer : Didn’t the Arizona State legislature pass a law that physics must to be taught with Intelligent Design?

What type of physics do you think would fit best as a career?

Description : What type of physics do you think would fit best as a career?

Last Answer : Find a mentor in your school (teacher or professor) that has an interest in one or all and have them guide you. It is more important that you are able to bounce your thoughts and theories off someone.

What type of physics do you find most interesting today and in the future?

Description : What type of physics do you find most interesting today and in the future?

Last Answer : I have always loved Astrophysics, but the future is in Particle Physics. They are now developing atom sized gears…

Can you help me with some portable physics?

Description : Can you help me with some portable physics?

Last Answer : Fascinating ! I don't have a specific answer for you but I bet that sort of problem has been solved well by rock-climbers. I think the solution is to use climbers' rope that absorbs the ... your kettle bells kick in immediately the sudden lurch of running out of slack rope could injure the faller.

What are the physics that makes my propane tank freeze with high output?

Description : What are the physics that makes my propane tank freeze with high output?

Last Answer : answer:Your tank freezes due to the same principle that makes your refrigerator or air conditioner work. When gas under pressure is allowed through a small orifice the gas cools upon expansion. This ... which gas law that this reflects. Perhaps it is some combination of certain ideal gas laws.

Jellyfish who are into physics, can you please explain to me why you think there is definitive "past"?

Description : Jellyfish who are into physics, can you please explain to me why you think there is definitive "past"?

Last Answer : It’s not realy physics as far as I can tell, except theoretical physics since it concerns space/time, but more along the lines of… i dont know, whtever studies that sort of thing.

A brilliant Engineer offers to make you one object, it must obey the Laws of Physics, it can be any one object you choose, so what object would you choose?

Description : A brilliant Engineer offers to make you one object, it must obey the Laws of Physics, it can be any one object you choose, so what object would you choose?

Last Answer : The perfect automobile. Impeccable suspension, engine, drivetrain etc.

Hi! :) I’m currently studying under a B.S Chemical Engineering program but i’m thinking of shifting to applied physics. What are the advantages of applied physics to chemical engineering? would it be better to stay on my current course?

Description : Hi! :) I’m currently studying under a B.S Chemical Engineering program but i’m thinking of shifting to applied physics. What are the advantages of applied physics to chemical engineering? would it be better to stay on my current course?

Last Answer : I'm not going to tell you about something I do not know about. I'm no expert in Chemical engineering or applied physics. I love applied physics though! If you have doubts about your current program you' ... be your work if you do engineering right? If you don't want that then think again! Good luck.

Can someone explain this physics problem?

Description : Can someone explain this physics problem?

Last Answer : answer:So for the first half of the journey the motorist is on track. At this point he has traveled 20 km and has spent 30 minutes doing it. Now for the next 10 km he travels at 20km/h, ... and has only covered 30km. Thus, to meet his goal the motorist must travel the last 10 km instantaneously.

What are some simple chemistry or physics "tricks" to use in a magic show for children?

Description : What are some simple chemistry or physics "tricks" to use in a magic show for children?

Last Answer : levitation using a hidden supercooled magnet.

Could you suggest a book that goes into slightly complex physics such as fluid dynamics but only the basics?

Description : Could you suggest a book that goes into slightly complex physics such as fluid dynamics but only the basics?

Last Answer : A Short History of Nearly Everything by Bill Bryson is a great read.

Could someone explain to me the frequency domain in physics?

Description : Could someone explain to me the frequency domain in physics?

Last Answer : answer:You regard a function of time as if it were a periodic wave, representing the superposition of multiple sine waves. Each sine wave has a different frequency, amplitude, and phase ... representation shows only the magnitude or power of each frequency, discarding some of the phase information.

Do you think in another solar system it would be possible for there to be no law of physics there or at least a completely different law of physics?

Description : Do you think in another solar system it would be possible for there to be no law of physics there or at least a completely different law of physics?

Last Answer : No. We can observe lots of different solar systems, and there’s no evidence of that being so.

Physics calculation- speed of a star?

Description : Physics calculation- speed of a star?

Last Answer : Relative to what?

What can I do with a physics and mathematics degree?

Description : What can I do with a physics and mathematics degree?

Last Answer : You would do much better in either of those fields with an advanced degree.

Can you help me come up with a name for my personal blog of physics and mathematics?

Description : Can you help me come up with a name for my personal blog of physics and mathematics?

Last Answer : My vote is in favour of TrivialQED. As someone who has extremely minimal knowledge in the way of both math and physics, a humourous title such as that one would be more likely to catch my attention ... read blogs about topics I know nothing about - especially if the writer injects a bit of humour.)

I need some help with a egg drop project for physics, any ideas?

Description : I need some help with a egg drop project for physics, any ideas?

Last Answer : Something like this is what immediately comes to my mind.

Please can someone try to explain this to a confused physics layman?

Description : Please can someone try to explain this to a confused physics layman?

Last Answer : These theories have really twisted ideas of geometry beyond what the human mind is capable of understanding. It just adds up, the equations work, but it doesn’t actually make any sense.

Anybody good in physics? Specifically Electrical Potential?

Description : Anybody good in physics? Specifically Electrical Potential?

Last Answer : or [email protected]

What's a good online site for Physics help?

Description : What's a good online site for Physics help?

Last Answer : When I’m trying to remember a formula or calculate something I use WolframAlpha. When I’m trying to remember a concept I use Wikipedia Can’t think of a physics-specific site offhand. Perhaps if you search for “rotational equilibrium” or “angular acceleration”?

What problem in physics would you like to be solved?

Description : What problem in physics would you like to be solved?

Last Answer : A total understanding of time. although, i think when we really understand time, it will lose some of its mysticism, and people will be surprised by why we thought the way we did.

Physics help...

Description : Physics help...

Last Answer : No one is your class will talk to you about this? What part of that question don’t you understand?

What is Aerodynamics -Physics

Description : What is Aerodynamics -Physics

Last Answer : Aerodynamics, is the study of motion of air, particularly when affected by a solid object, such as an airplane wing. It is a sub-field of fluid dynamics and gas dynamics, and many aspects of ... a kite in the sky react to aerodynamics. Aerodynamics even acts on cars, since air flows around cars.

How to determine Axial Force Coefficient in Ansys Fluent ? -Physics

Description : How to determine Axial Force Coefficient in Ansys Fluent ? -Physics

Last Answer : I want to determine the aerodynamic coefficients of a 2D model (solid boosters). To be clear with the model, It is a 2D axisymmetric model, with blunt nose and flared aft body. There is a ... jet pressure ratio. Am I missing something or is there any other method to find axial force coefficient.

Can power be negative if the work done is negative? -Physics

Description : Can power be negative if the work done is negative? -Physics

Last Answer : Negative power in this context would mean the same thing as negative work: negative work means that the system - in this case, the block - is having mechanical energy stolen from it, just as positive work means it's acquiring energy.

The frequency of a source of sound is 200 hz.How many Times does it vibrate in 2 min? -Physics

Description : The frequency of a source of sound is 200 hz.How many Times does it vibrate in 2 min? -Physics

Last Answer : Hence, the source vibrates 12000 times in a minute, producing a frequency of 00 Hz.

What is the SI unit of loundness? -Physics

Description : What is the SI unit of loundness? -Physics

Last Answer : Sone, unit of loudness. Loudness is a subjective characteristic of a sound (as opposed to the sound-pressure level in decibels, which is objective and directly measurable).