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Post by GRowell on Sept 1, 2021 23:54:52 GMT
Does that mean that a mass on the moon has a different inertia? Getting shot on moon is less painfull then? Something is out.
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andydp
Tenured Full Professor
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Post by andydp on Sept 2, 2021 13:40:23 GMT
You lost me at "Einstein". If I remember it correctly, which is not a given by any means, one of the major assumptions underlying the general theory of relatively is that they these two masses are, in fact, equivalent.
They are the same within our limits to measure them, which is an important detail.
Strangely enough, I can actually grasp this concept: a car at rest has the same mass as a car doing 60. Other factors such as speed would be "extraneous" and not add to the actual mass of the car. Feel free to shoot me out of the water. Remember, I have a hard time balancing my checkbook.
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Post by indy on Sept 2, 2021 19:44:20 GMT
If I remember it correctly, which is not a given by any means, one of the major assumptions underlying the general theory of relatively is that they these two masses are, in fact, equivalent.
They are the same within our limits to measure them, which is an important detail.
Strangely enough, I can actually grasp this concept: a car at rest has the same mass as a car doing 60. Other factors such as speed would be "extraneous" and not add to the actual mass of the car. Feel free to shoot me out of the water. Remember, I have a hard time balancing my checkbook.
We are getting into areas where I have to dust the cobwebs away in what physics I was able to absorb, so hopefully somebody can correct any errors.
According to Einstein's special relatively theory, the mass of your car at rest does not have the same mass as the car doing 60. The mass of the car at rest is called, appropriately, its rest mass. The car in motion has what's called its relativistic mass to an observer of the car. There is an equation that relates the two together but suffice it to say that a car doing 60 would have a relativistic mass extremely close to its rest mass. As you approach the speed of light, however, relativistic mass increases such that traveling at the speed of light would produce an object of infinite relativistic mass. This is the extremely simplified explanation for the concept that nothing can travel at or faster than the speed of light.
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Post by LFC on Sept 2, 2021 21:07:20 GMT
All of this talk about Einstein, relativity, and the speed of light reminds me of this great Steven Wright joke.
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andydp
Tenured Full Professor
Posts: 3,010
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Post by andydp on Sept 2, 2021 22:14:02 GMT
Strangely enough, I can actually grasp this concept: a car at rest has the same mass as a car doing 60. Other factors such as speed would be "extraneous" and not add to the actual mass of the car. Feel free to shoot me out of the water. Remember, I have a hard time balancing my checkbook.
We are getting into areas where I have to dust the cobwebs away in what physics I was able to absorb, so hopefully somebody can correct any errors.
According to Einstein's special relatively theory, the mass of your car at rest does not have the same mass as the car doing 60. The mass of the car at rest is called, appropriately, its rest mass. The car in motion has what's called its relativistic mass to an observer of the car. There is an equation that relates the two together but suffice it to say that a car doing 60 would have a relativistic mass extremely close to its rest mass. As you approach the speed of light, however, relativistic mass increases such that traveling at the speed of light would produce an object of infinite relativistic mass. This is the extremely simplified explanation for the concept that nothing can travel at or faster than the speed of light.
Again, this is why I have a hard time with my checkbook. I appreciate your efforts and simple talk. Now I have to figure out where the checkbook is…
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Post by indy on Sept 3, 2021 11:08:26 GMT
We are getting into areas where I have to dust the cobwebs away in what physics I was able to absorb, so hopefully somebody can correct any errors.
According to Einstein's special relatively theory, the mass of your car at rest does not have the same mass as the car doing 60. The mass of the car at rest is called, appropriately, its rest mass. The car in motion has what's called its relativistic mass to an observer of the car. There is an equation that relates the two together but suffice it to say that a car doing 60 would have a relativistic mass extremely close to its rest mass. As you approach the speed of light, however, relativistic mass increases such that traveling at the speed of light would produce an object of infinite relativistic mass. This is the extremely simplified explanation for the concept that nothing can travel at or faster than the speed of light.
Again, this is why I have a hard time with my checkbook. I appreciate your efforts and simple talk. Now I have to figure out where the checkbook is…
Well, I provided something I thought was easy to type in a paragraph and yet kind of explain it, but it's important to note most any physicist will (quite fairly) dispute it as inaccurate. Still, most introductory physics textbooks (when I was using them, maybe it has changed since then) explain it this way because a more precise explanation requires concepts most people just aren't familiar with.
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Post by LFC on Sept 3, 2021 17:39:07 GMT
Again, this is why I have a hard time with my checkbook. Wait a sec. You have a hard time with your checkbook because its mass increases when it's moving?
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andydp
Tenured Full Professor
Posts: 3,010
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Post by andydp on Sept 3, 2021 17:50:15 GMT
Again, this is why I have a hard time with my checkbook. Wait a sec. You have a hard time with your checkbook because its mass increases when it's moving? I’ll use that next month. Thanks
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Post by goldenvalley on Sept 17, 2021 21:56:44 GMT
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Post by Bact PhD on Sept 18, 2021 0:49:44 GMT
We were out there in 2018.
Hope the backfires work; it would be a shame to lose those trees.
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Post by Bact PhD on Sept 22, 2021 16:52:35 GMT
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andydp
Tenured Full Professor
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Post by andydp on Sept 22, 2021 22:11:06 GMT
Sirius XM success !!
I get an e mail offering me three free months on an "inactive radio" in the Corvette. I try to activate but get nothing, then I look at the letter. Seems they are giving me three months on a radio that I took out of the car three years ago. Called customer service but the final word was they can't activate my new radio. I wrote a letter saying I was not pleased and thought it was a bit silly to offer me three months on a radio I don't have in the car anymore.
I get a message to call the customer service to try an straighten this out. I called and was very polite explaining its a bit silly to offer me a deal on a removed radio. They still can't activate my new radio BUT... they're giving me a special "intro" rate of $6.00/Month for a year to make up for my inconvenience.
I have to say I'm well pleased with the outcome. Since I have Apple Play on the new Corvette radio this is a major win for my budget.
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Post by goldenvalley on Sept 22, 2021 23:27:50 GMT
The Villages style living is fine when one is a relatively healthy retired person, but eventually you'll have to think about being near family to help you go to medical appointments and to show up at the hospital when you end up there. My farm grandparents lived in a ye olde mobile home park for years and they had fun for a while. Eventually they couldn't make the trip and were too far for my mom to help them out in a hurry.
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andydp
Tenured Full Professor
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Post by andydp on Sept 23, 2021 0:26:19 GMT
The Villages style living is fine when one is a relatively healthy retired person, but eventually you'll have to think about being near family to help you go to medical appointments and to show up at the hospital when you end up there. My farm grandparents lived a ye olde mobile home park for years and they had fun for a while. Eventually they couldn't make the trip and were too far for my mom to help them out in a hurry. I have VERY mixed (mostly negative) feelings about going to an "over 55" area. While it would be convenient to be near places that cater to people in your demographic, the downside is if you hang around all those old people and their ailments you'll get older faster and pick up their ailments.
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Post by Bact PhD on Sept 23, 2021 1:11:56 GMT
The Villages,FL has come up in conversation a few times. Maybe not all of us aging Boomers want to live in endless Old People-ville (we sure as hell don’t!)?
The Villages style living is fine when one is a relatively healthy retired person, but eventually you'll have to think about being near family to help you go to medical appointments and to show up at the hospital when you end up there. My farm grandparents lived in a ye olde mobile home park for years and they had fun for a while. Eventually they couldn't make the trip and were too far for my mom to help them out in a hurry. The thing is, though, if you are a 60-something couple in Cincinnati (or Trenton, or Buffalo...), and your offspring are grown and raising their kids in Atlanta and Kansas City (Austin/Charlotte/Seattle...), the kids are going to be no farther away from you if you go where it's sunny and warm most of the year than if you stay put. Might as well have the fun in the sun while you're still able to. The eventual decline is far enough in the future that that's a bridge to get crossed when you get to it.
My personal story on this very issue: In the case of Chem PhD, his father was long deceased by the time I entered the picture; his mother had carved out a very active life for herself in the PA burg where Chem grew up. She had already decided on a CCRC1 in that burg that she would go to, and did so once she decided not to keep the house anymore. Even though Chem was the only child, and he had moved to FL in the 1980s, she had more than enough assistance from friends and neighbors, and later the retirement facility, that she only needed our help when it came time to sift through the STUFF prior to the move (she downsized BIG TIME).
In my case, Daddy Dear passed before Dear Son's second birthday. Mommie Dearest kept the South Florida home for some years afterwards, riding out the Great Recession. Truth be told, she was all set to transition to a CCRC in South Florida when both her broker and I asked whether she had looked into the community here; she had not. She actually did NOT want to move closer to us, at the risk of being too close. One visit and she was sold. She made the visit in early October; by December 15 she was moved and settling in up here.
1CCRC = Continuing Care Retirement Community. The kind of place that has multiple modes of living - independent, assisted, and nursing care -- all in one place. The buy-in is pretty pricey, but the care is there if/when it's needed. They have all sorts of activities, provide transportation if needed, dining,...
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Post by LFC on Sept 23, 2021 21:25:18 GMT
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Post by LFC on Sept 24, 2021 20:31:56 GMT
A tale of " luxury" condos. Sounds like some of the stories that have come out of China.
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Post by goldenvalley on Sept 24, 2021 22:40:04 GMT
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pnwguy
Associate Professor
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Post by pnwguy on Sept 24, 2021 23:48:56 GMT
A tale of " luxury" condos. Sounds like some of the stories that have come out of China. Sounds like an ideal Trump property.
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Post by LFC on Sept 27, 2021 15:07:30 GMT
Engineers think they can fix everything but I sure as heck wouldn't buy a condo in that building for any amount of money, not ever. The original buyers are screwed. Has the company that built it gone bankrupt yet? That seems to be the standard procedure. Many developments around my area, and likely across the nation, are built by individual "companies." Sometimes the "company" is a partnership but often its a wholly owned subsidiary of a well known builder. The profits are passed to the owner(s). When the development is complete the "company" that built it sits around for a few years handling some warranty items but generates no economic activity and then shuts down. If you have big problems years later due to a building defect (i.e. they f***ed up and actually broke the law, intentionally or not, by violating building codes) then there's no entity left to sue. You can try to go after the still existing former owning company by it's a bigger uphill battle to push the liability onto them.
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Post by goldenvalley on Sept 27, 2021 16:42:40 GMT
Engineers think they can fix everything but I sure as heck wouldn't buy a condo in that building for any amount of money, not ever. The original buyers are screwed. Has the company that built it gone bankrupt yet? That seems to be the standard procedure. Many developments around my area, and likely across the nation, are built by individual "companies." Sometimes the "company" is a partnership but often its a wholly owned subsidiary of a well known builder. The profits are passed to the owner(s). When the development is complete the "company" that built it sits around for a few years handling some warranty items but generates no economic activity and then shuts down. If you have big problems years later due to a building defect (i.e. they f***ed up and actually broke the law, intentionally or not, by violating building codes) then there's no entity left to sue. You can try to go after the still existing former owning company by it's a bigger uphill battle to push the liability onto them. A cursory search shows no bankruptcy filing. Apparently the building is still considered seismically safe and compliant with San Francisco building codes. I still wouldn't buy (not that I could afford to anyway).
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Post by theronmad on Sept 28, 2021 15:51:01 GMT
I would like to mention about archeology. Many scholars and public media may be under the delusion that only the French were the butts and discoverers of history. This stigma lingers on because of the discoveries and excavations in Egypt. But relatively recently, by the way, in my college essay, I wrote about the fact that the British also made a very great contribution to the formation and structuring of the history of which we see it now. By the way, if someone is interested, then my work can be found at essaywritinghelp.pro/buy-research-papers/ in their blog of examples of work
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andydp
Tenured Full Professor
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Post by andydp on Sept 28, 2021 20:35:57 GMT
Not to be outdone by the smart people ahead of me, I am now going off on a tangent of mundaness. Took me two hours to mow my lawn of three+ week's worth of grown grass (usually takes an hour). I'm happy it was "cool" since I would have collapsed by the last 1/3 of lawn. After a one hour recovery and shower, off to the framing company to retrieve art photos we had framed: a Dungeness crab (ILO a blue crab) to remind my wife of crabbing with her dad in the Delaware Bay. A nice art photo of the US Flag. I also brought over a NY Daily News Magazine Center Page I had saved as a kid in 1966. The original is in the Hall Of Fame. I saw the same thing for sale at $500+. My framing will cost about $ 250. Can't wait to hang it up. Did some food and booze "window" shopping. Came home, and having a beer. I'm posting the link to the print. If anyone wants to feel free to post the actual print. collection.baseballhall.org/PASTIME/casey-bat-cartoon-1961-april-16-0
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Post by goldenvalley on Sept 28, 2021 21:43:51 GMT
That's a cool print. We're off to the Baseball Hall of Fame & Museum in addition to our Lake Placid visit. I fully expect my husband to want to get something like that print for himself or something related to the Red Sox of his childhood.
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andydp
Tenured Full Professor
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Post by andydp on Sept 28, 2021 22:54:13 GMT
That's a cool print. We're off to the Baseball Hall of Fame & Museum in addition to our Lake Placid visit. I fully expect my husband to want to get something like that print for himself or something related to the Red Sox of his childhood. Its actually one of the few poems I know more than one stanza. I loved it when it was published, I kept it. Now I’m getting it framed.
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