# Light at Light Speed

Discussion in 'Physics & Math' started by Bowser, May 1, 2011.

1. ### Motor Daddy☼☼☼☼☼☼☼☼☼☼☼Valued Senior Member

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Really, so you can measure time when you are sleeping? Can you differentiate between how much time has passed in your memory? Can you differentiate the difference in time in memories? Can you tell the difference in time between last week and last month? Do you have memories of 10 years ago that you could swear happened yesterday, or 2 minutes ago, or 3 seconds ago? Can you tell the difference without knowing how long ago it was? I've heard many many people, myself included say, "it seems like it happened just yesterday." Do you think they are lying? I've heard people say I don't feel 40 years old, and I can't believe that I am 40 years old. It seems like just yesterday I was 20 years old. Do you think they are BSing, or do you think they can't tell the difference in something that happened 2 minutes ago, and something that happened 30 years ago?

3. ### arfa branecall me arfValued Senior Member

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Motor Daddy: do you have an explanation for your sense of weight?

No? Didn't think so.

5. ### Motor Daddy☼☼☼☼☼☼☼☼☼☼☼Valued Senior Member

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I don't have a sense of weight, I have a sense of force, and a sense of acceleration.

If you want to tell me you can accelerate in only the time dimension, tell me how you measure that acceleration of time, and tell me what units you use to measure that acceleration of time?? Do not even try to sneak in a "m", or "v" in there. Tell me what units you measure the acceleration of time in?

7. ### arfa branecall me arfValued Senior Member

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You are being intentionally difficult. The sense of force and acceleration you have, that most people call weight, how do you explain this sense you have when you stand still?

You know the one I mean: the sense you have of a 'force' pulling you towards the ground. The same one that makes blood collect in your body below where your heart is.

Tell me what your explanation is, and what units you use to describe it physically (so a physicist would understand it).

That is nonsensical (as usual). Time doesn't accelerate, you do. But not in your 'apparent' 3-space.

8. ### Motor Daddy☼☼☼☼☼☼☼☼☼☼☼Valued Senior Member

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You are very confused. You don't know the difference between force and acceleration.

If there is a tug of war, and both sides apply equal force, there is no acceleration. You can apply 50,000 lbs of force on each side in opposite directions, and as long as the force remained equal, there would be ZERO acceleration. Do you understand that concept?

9. ### arfa branecall me arfValued Senior Member

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Are you saying that the force of gravity disappears when you stop moving?

Because you are motionless, you experience no net force, so you have zero weight when you stand still? Or is that just your confusion?
So can I assume that since I've asked you to provide an explanation for your experience of weight, and you haven't provided one, that you don't have an explanation? I thought so.

10. ### Motor Daddy☼☼☼☼☼☼☼☼☼☼☼Valued Senior Member

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No, I'm saying that when you are laying on the beach, the forces are equal, like in the tug of war, and there is ZERO acceleration.

11. ### arfa branecall me arfValued Senior Member

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You mean to say, there is zero acceleration in space, right?
I thought so.

12. ### Motor Daddy☼☼☼☼☼☼☼☼☼☼☼Valued Senior Member

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No, in space you would be accelerating towards a massive object, because there is a NET FORCE greater than zero. If there was a zero net force, like on the beach, you wouldn't be accelerating.

13. ### arfa branecall me arfValued Senior Member

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Motor Daddy: you can accelerate one-dimensionally in one of three spatial directions, right?
That's because you are a bounded volume with mass, right? Your momentum changes when you accelerate one-dimensionally, right?

14. ### Motor Daddy☼☼☼☼☼☼☼☼☼☼☼Valued Senior Member

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Mass has nothing to do with measuring distance and time, and the calculation of the rate at which the velocity was increasing or decreasing over time. The units of measure for acceleration are meters/second^2. Where do you see mass in there?

If I measured an object's velocity was 20 m/s at t=1, 40 m/s at t=2, 60 m/s at t=3, 80 m/s at t=4, and 100 m/s at t=5, you could calculate the acceleration of the object, correct?

Are you saying I need to know the mass of an object to calculate the object's acceleration rate?

15. ### arfa branecall me arfValued Senior Member

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Still no closer to that explanation for your sense of weight.

Does your acceleration due to gravity depend on mass? Are you saying you don't need to know the mass of an object to calculate F = ma?

16. ### Motor Daddy☼☼☼☼☼☼☼☼☼☼☼Valued Senior Member

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Do you plan on answering any questions or just ignoring everything I ask you?

17. ### arfa branecall me arfValued Senior Member

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You don't look like you're making any plans to answer any of mine.

This is a trick question: How do you know you aren't in free fall towards the surface of the earth?
Another one: Do you agree that the universe has four dimensions?

P.S. I'd like to go over this again
And what you mean to say is, when you are laying on the beach, the forces are equal, and there is zero acceleration in space.

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19. ### arfa branecall me arfValued Senior Member

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Nope, sorry.
That would be pointless. Like trying to get someone to think about what they're really saying can be pointless.

20. ### Motor Daddy☼☼☼☼☼☼☼☼☼☼☼Valued Senior Member

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I didn't think so. You've never let facts stand in the way of your BS, why would you start now.

21. ### arfa branecall me arfValued Senior Member

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According to the equivalence principle, you can't tell the difference between being accelerated at g = 9.81 m/s in space in one dimension, and being accelerated at the same g in the time dimension by a gravitational field, while not, in other words, in free fall.

That means that in this field, the dimension that time is "in" is a choice an observer makes.

22. ### Motor Daddy☼☼☼☼☼☼☼☼☼☼☼Valued Senior Member

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Still no answer to my questions. Why should I have a conversation with you when you refuse to answer my questions?

23. ### arfa branecall me arfValued Senior Member

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That isn't true. I have offered answers to the questions you asked, these ones:
You probably don't know enough to see that. You don't understand what equilibrium means, I think. I would say the equivalence principle probabaly throws you as well. After all it was Einstein's idea.

More to the point: what conversation? Where are your answers to any of my questions?