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The SRians Said: Time is What the Clock Measures
The SRians Said: Time is What the Clock Measures
This definition for time implies that a clock second represents the same "duration" (universal time?) in all frames. The SRians compare the passage of clock seconds directly in the twin paradox scenario confirms this interpretation for time.. Question: Does this mean that a clock second is an interval of universal time? Ken Seto |
#2
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kenseto wrote:
The SRians Said: Time is What the Clock Measures This definition for time implies that a clock second represents the same "duration" (universal time?) in all frames. The SRians compare the passage of clock seconds directly in the twin paradox scenario confirms this interpretation for time.. Question: Does this mean that a clock second is an interval of universal time? Yes |
#3
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"jem" wrote in message news:IGOae.32553$d43.18173@lakeread03... kenseto wrote: The SRians Said: Time is What the Clock Measures This definition for time implies that a clock second represents the same "duration" (universal time?) in all frames. The SRians compare the passage of clock seconds directly in the twin paradox scenario confirms this interpretation for time.. Question: Does this mean that a clock second is an interval of universal time? Yes Ah....but this would mean the existence of universal time (absolute time) which is denied by SR. Also this is in conflict with what Alan Lightman said in his book "Great Idea in Physics" page 120. He said: a clock second in one frame correspond to less than a clock second in another frame. So how do you explain these apparaent contradictory statements? Ken Seto |
#4
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"kenseto" wrote in message ... The SRians Said: Time is What the Clock Measures This definition for time implies that a clock second represents the same "duration" (universal time?) in all frames. No. This definition for time implies that time is not necessarily the same for two observers who carry identical clocks. The SRians compare the passage of clock seconds directly in the twin paradox scenario confirms this interpretation for time.. No. The elapsed time between two events can depend on the clock on which the times of the events are read. Question: Does this mean that a clock second is an interval of universal time? No. It means that you are an imbecile. Dirk Vdm |
#5
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kenseto wrote:
"jem" wrote in message news:IGOae.32553$d43.18173@lakeread03... kenseto wrote: The SRians Said: Time is What the Clock Measures This definition for time implies that a clock second represents the same "duration" (universal time?) in all frames. The SRians compare the passage of clock seconds directly in the twin paradox scenario confirms this interpretation for time.. Question: Does this mean that a clock second is an interval of universal time? Yes Ah....but this would mean the existence of universal time (absolute time) which is denied by SR. Also this is in conflict with what Alan Lightman said in his book "Great Idea in Physics" page 120. He said: a clock second in one frame correspond to less than a clock second in another frame. So how do you explain these apparaent contradictory statements? Everyday language isn't the appropriate tool for describing what's going on in Relativity (look to the mathematics of the SR model instead). A stationary observer measures the duration of one second on a moving clock to be less than one second on a stationary clock, and in this sense clock seconds are of different durations in different reference frames. However, SR assumes all clocks are identical and are unaffected by motion, so in this sense one second has the same duration in all reference frames. Moving clocks simply accumulate fewer seconds than stationary clocks. This desription is probably the better of the two. |
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"kenseto" wrote in message ... This definition for time implies that a clock second represents the same "duration" (universal time?) in all frames. The SRians compare the passage of clock seconds directly in the twin paradox scenario confirms this interpretation for time.. No paradox. It is the same in all frames. It isn't the same relative to all frames. |
#7
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"kenseto" wrote in message ... Ah....but this would mean the existence of universal time (absolute time) which is denied by SR. Nope. Two twins are 18 years old. One guy hops on Carl Sagans starship and zips around the galaxy at 99.999% the speed of light for 5 years. He comes back to earth and is no longer the same age as his brother. However, time passed the same for each of them. Seconds passed at the same rate for each of them. Common Sensical? Definately Nope. Paradox? Nope. |
#8
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"jem" wrote in message news:GFPae.32562$d43.23992@lakeread03... However, SR assumes all clocks are identical and are unaffected by motion, so in this sense one second has the same duration in all reference frames. Moving clocks simply accumulate fewer seconds than stationary clocks. This desription is probably the better of the two. Actually clocks accumulate the same number of seconds, they only seem different if you compare them later.. a second isn't some seperate property of matter that hops around depending on how fast you are moving, it merely seems different because everything is relative. |
#9
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kenseto wrote:
The SRians Said: Time is What the Clock Measures [snip] Stop while you are nowhere. -- Uncle Al http://www.mazepath.com/uncleal/ (Toxic URL! Unsafe for children and most mammals) http://www.mazepath.com/uncleal/qz.pdf |
#10
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The SRians Said: Time is What the Clock Measures
Are they members of the APS ? http://www.aps.org/resources/ This definition for time implies that a clock second represents the same "duration" (universal time?) in all frames. This definition is almost completely useless. And while it may be true, time is most importantly considered the 4th dimension of Mikowski spacetime. Question: Does this mean that a clock second is an interval of universal time? No. What it means is that time (the dimension), does some really weird and unexpected things. It's all relative. |
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