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fedorfan
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Hypothetically, if you had an engine that had unlimited revs or unlimited gears would it have infinite top speed NOT acknowledging air resistance,universal speed limit, and fuel?
No, it would never reach the speed of light.fedorfan said:Hypothetically, if you had an engine that had unlimited revs or unlimited gears would it have infinite top speed NOT acknowledging air resistance,universal speed limit, and fuel?
fedorfan said:Why wouldn't it? If it has unlimited gears doesn't that mean it would accelerate forever? I know its a pointless question but I was just wondering.
It is not really a pointless question at all. There are motor designs that can do this in principle. Look up 'Bussard ramjets'.fedorfan said:Why wouldn't it? If it has unlimited gears doesn't that mean it would accelerate forever? I know its a pointless question but I was just wondering.
Time Elapsed Acceleration Velocity (as a per cent of c)
0 (Start) a 0
after one year a 90
after two years a 99
after three years a 99.9
after four years a 99.99
after five years a 99.999
...
DaveC426913 said:but as per Einstein's Special Theory of Relativity, a constant acceleration doesn't result in a constant increase in velocity.
electricsheep said:Hi DaveC, I may be nitpicking here, but when I studied special relativity back in high school, I had a lot of trouble with statements such as this one, because it doesn't specify the frame of reference from which you're viewing the body. I feel it's important to specify that here, "constant acceleration" is the "apparent acceleration" from the point of view of someone who is, say, riding on the engine.
This link explains it more clearly than I do. http://physics.nmt.edu/~raymond/classes/ph13xbook/node59.html" [Broken]
fedorfan said:Hypothetically, if you had an engine that had unlimited revs or unlimited gears would it have infinite top speed NOT acknowledging air resistance,universal speed limit, and fuel?
Lot of info out there about it - it's been studied. The technology is far beyond current ability.fedorfan said:That bussard ramjet is very interesting and an ingenious but simple idea. Why haven't they made one yet?
This is an adequate explanation in the light of the question asked, but one should note that E=mc^2 refers to the rest energy of an object, which stays constant under acceleration by an external force.electricsheep said:The faster something moves, the more kinetic energy it has. E=mc^2, so the faster it moves, the heavier it becomes...
Jorrie said:This is an adequate explanation in the light of the question asked, but one should note that E=mc^2 refers to the rest energy of an object...
Jorrie said:It is really the relativistic momentum that increases with speed and approaches infinity in any inertial reference frame if the speed in that frame approaches the speed of light. The relativistic momentum is given by:
[tex]p = \frac{mv^2}{\sqrt{1-v^2/c^2}}[/tex]
You are not wrong, just the modern concept of mass is different. Seeelectricsheep said:Actually, I don't think E is the rest energy, because that would imply m is the rest mass, which is not incorrect but entirely irrelevant to what I was explaining there...
Please provide me with a reference if I'm wrong.
This is the "older" definition. The use of the terms rest mass and relativistics mass is on the decline, but still found in plenty of writings, making it somewhat confusing sometimes.electricsheep said:And your expression is also incorrect. It should be:
[tex]p = \frac{{m_0}v}{\sqrt{1-v^2/c^2}}[/tex]
http://hyperphysics.phy-astr.gsu.edu/hbase/relativ/relmom.html#c1"
Jorrie said:You are not wrong, just the modern concept of mass is different. See
http://www.geocities.com/physics_world/mass_paper.pdf
Jorrie said:This is the "older" definition. The use of the terms rest mass and relativistics mass is on the decline, but still found in plenty of writings, making it somewhat confusing sometimes.
electricsheep said:That wasn't what I was trying to point out. Your original expression for relativistic momentum had [tex]v^2[/tex], which made me do a double take and do a quick search on the web just to confirm my memory. But yes, I think I'm thread-jacking now. My apologies.
"Unlimited Revs & Gears" is a feature in some high-performance vehicles that allows the engine to rev higher and shift into higher gears at a faster rate. This is achieved through advanced engine tuning and transmission technology, allowing for faster acceleration and higher top speeds.
In most cases, "Unlimited Revs & Gears" is safe for the engine and transmission as long as the vehicle is properly maintained and not pushed beyond its limits. However, constant use of this feature may result in increased wear and tear on the engine and transmission.
The main benefit of "Unlimited Revs & Gears" is improved performance and speed. It allows for faster acceleration and higher top speeds, making it ideal for racing or track use. It can also provide a more exhilarating driving experience for those who enjoy high-speed driving.
No, "Unlimited Revs & Gears" is typically only available in high-performance vehicles that are specifically designed for racing or track use. It requires advanced engine and transmission technology that is not commonly found in regular consumer vehicles.
While "Unlimited Revs & Gears" can provide improved performance, it also has some downsides. It may result in decreased fuel efficiency and increased wear and tear on the engine and transmission. It also requires proper training and skill to use effectively, as pushing the vehicle beyond its limits can be dangerous.