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the doctor calls up marty and says marty youve got to come into my office immediately, i must speak to you about your test results.
marty comes in and goes right into the doctors office.
the doctor says: marty ive got bad news and worse news.
okay doc whats the bad news?
marty im sorry but the tests show that you have only 24 hours to live.
doctor, whats worse than that!?
well marty, i meant to call you yesterday.
its funnier if you spell it dangaroo
and the sign said “Beware, All The Animals are Dangerous”
but thanks for the compliment
machirology: the study of how to look like a very important person.
melissopalynology: the study of the friends of anyone named melissa.
deltology: investigating the inner workings of faucets
gelotology: the compiling of jello recipes
hippology: the study of why people put on weight after age 40
i thought this was tech talk for some new blackberry used to surf the web in some improved way
seriously thats what i thought
I of course wholey agree with your rebuttal pegger
I always said one would go flying off the earth
I only said it would be slowly not at 30 kilometers per second
Which is not compatible with the description from cornell
I truly am sorry you chose to end the discussion like this
Eventually they would go much faster
Has nothing to do with this discussion
that is referring to the eventual perceptual conversion
of the perceived movement of the object in question from that
Relative to the surface of the earth
to that relative to the earth as a whole body
which would be on the order of weeks to become significant.
As to your rebuttal pegger i am disapointed
I thought you would exhibit some honesty
We all can be wrong sometimes
the article was quite clear as to the nature of what was meant by
flying.
His description was not at all compatible with
a veocity of 30k per second.
from the cornell dept of astronomy:
link to the “article”:
http://curious.astro.cornell.edu/question.php?number=284
What would happen if the gravity on Earth was suddenly turned off?
….In buildings, people would start floating gently upwards until they bumped into the ceiling. Outdoors, however (or in buildings with GIANT ceilings), things would start floating away from the Earth gently but eventually go much faster, as their straight lines took them farther and farther away from the circular path that the spinning Earth takes.
…In fact, the force you would need to hold on and keep yourself from flying away from the Earth is very weak, only about 0.3% as strong as the force of gravity (and even weaker away from the equator).
emphasis is mine
pegger
let me give it one more try
if you dont agree with the analysis we can leave it as a disagreement
indeed you stop spinning.
which has no effect on your tangential movement which is directly perpendicular to the direction of the force of gravity
you will continue to move in a linear 30k/s exactly as you did before due to there being no force to act to change your momentum. as you continue to move in a straight line tangential to the earth at 30k/s, the earth continues to move below you at a speed of 30k/s as before thus there being no change in your situation relative to tangential movement in relationship to the earth.
what does change is that as you say you are no longer spinning. what does that mean? it means that your ANGULAR VELOCITY is now null, you areno loner changing direction in concert with the earths angular velocity. your angular velocity has now become zero since the source of the centripital force has been removed.
but now the difference between your angular velocity (zero) and the earths angular velocity (a very small 1 revolution per 24 hours) and you will gradually rise away from the spot of earth below you as it continues to change direction, and you do not.
but as far as your tangential movement relative to the surface of the earth nothing has changed by the cessation of gravity. you are moving at 30k/s (as a result of your momentum which no force has altered, and the earth is moving under you at that same 30k/s just as before, as similarly no force has acted to change this.
you will slowly rise as the the earth spins and you are no longer spinning with it.
if you dont get it, try this thought experiment:
you lift yourself with a crane to 500 feet above the earth (the 500 feet-crane part of this isnt necessary but it might help to prevent certain misunderstandins) you are equipped with downward pointing thrusters exactly equal to the effect of gravity on you.
as the crane releases you, you turn on the thrusters. you have now eliminated all centripital force and are no longer “spinning with the earth” are you going to suddenly fly away at 1,000 miles per hour? of course not, but you will very slowly become more distant from the earth as the earth contues to turn.
feel free to submit your rebuttal but i quit, thanks for the interesting discussion
You would not fly off into space
You would slowly rise based on the angular velocity
The centripital force is supplied by the friction as i described
And curiousone you are way off. the second equation is only a particular application of the general
Equation
Gravity is in no way reqired for friction
Friction can in fact act in opposition to gravity
This is basic
okay
approximately how many bones are there in a human infant, and how many in a human adult?
i say approximately because there is some natural variation and also differences in the definition of certain bones
What is beta oxidation, and why does it help camels?
see here:
http://www.theyeshivaworld.com/coffeeroom/topic/the-camel-and-the-desert
curiousone;
to put it another way, even if the earths gravity were to suddenly completely cease, we would not go flying off the earth. in fact the centrifugal force would be so negligible as to be “practically” non-existent. picture an ant sitting on the end of the HOUR hand of a smoothly moving analog clock (not one that “ticks”). how much centrifugal force is that ant experiencing from the movement of the hand. that hand is moving at the same angular acceleration as the earth.
[of course you would have to make SOME kind of effort to stay put such as touching any object attached to the earth, say a tree. the friction of the slightest touch would keep you from slowly eventually floating away, as long as you didnt make any kind of motion against the earth, such as walking.]
thecurioseone
no
the centripital force is unnafected by gravity
it is true that the net force on an object situated on a rotating body (the net force acting to keep the object on the body or away from the body, (ie the weight, in simple terms) is influenced both by the force of gravity vs the rotational (angular) acceleration, but those two parameters have zero influence on each other.
in other words, a device which measures centripital force would give a reading thousands of times greater on the mgr than on the earth even if the mgr would somehow have a pull towards the center equivalent to earths gravity. that was the essence of the question as i restated it. the original question was not clear as i should have not used “dizziness” as the main differential factor between the two cases. i tried a couple of times to fix that.
right
the angular velocity is the only parameter that involves acceleration, and therefore the perception of movement.
the mgr goes through a full circle in about 1/2 a minute while the earth rotates through a full circle in 24 hours.
so in terms of RPM (revolutions per minute) them mgr is actually moving about 2,500 times faster than the earth.
yes pegger, notice my use of the quotation marks: centrifugal “force”.
nevertheless, because i am not speaking to a group of physicists it is perfectly acceptable to use the common term: centrifugal force, as it IS an “apparent’ or “virtual” force though not a force in the strict sense.
and yes you are always accelerating when moving in a circle. do you have an answer to the question: why is the centrifugal (if you prefer: centripital) force greater on the slowly moving mgr than on the rapidly moving earth?
the answer is a matter of very elementary (1st year high school or even less) beginning physics.
you need to know the basic definition of “accceleration”, and the difference between “velocity” and “speed”
no. no and no
it has nothing to do with the frame of reference, it has nothing to do with seeing things around you. forget “dizziness, that was a bad way of putting the question, think in terms of “feeling” the turning.
the situation will be the same if the merry-go-round is located alone in outer space, just as the earth is
here is an easier way to look at the problem, instead of talking about human perception:
say you have a measurement device with you that measures centrifugal “force”.
although the merry-go-round (now relocated in outer space, off the earth)is rotating at a speed of say 5 miles per hour, and the earth is rotating at 1,000 miles per hour, the centrifugometer will measure over 10,000 (something like that, i didnt actually calculate it) times the amount of centrifugal force on the m-g-r than it does on earth. why is that?
if the m-g-r would move at 1,000 miles per hour (as does the earth) you would be instantly and violently thrown off, even if the m-g-r had the same gravity as the earth does. why arent we thrown off the earth?
even if you close your eyes the effect is the same
i have a physics question:
why when on a merry-go-round, especially a fast one, you can clearly feel the circular motion and some even get dizzy,
but we dont feel the rotation of the earth?
the merry-go-round is only moving a few miles per hour
the earth is rotating at over 1,000 miles per hour.
i know (knew) someone, went to high school with him. he died suddenly in his forties of an unusual heart condition. about 2 weeks after he told Bais Din he would not ever, under any circumstances, ever give his wife a Get.
This is totally on their own. No one asks them to do anything of the sort.
thats because the place you daven is led by true Gedolim who are held in great respect and awe by those that daven there. the atmosphere of Toras EMES even permeates to the street.
which makes me think:
actually im not sure if you COULD replace ninety with googol (and my googolplex answer would also be incorrect)
im not so sure that “googol” is a number.
one hundred is a number, two hundred is a number, is “hundred” a number? im inclined to say no, but i can see how one could argue yes (based on common understanding that stam hundred is one hundred)
its the largest number, of that many letters, using that particular nomenclature, however you define it.
if you dont like the nomenclature caveat then youre right.
you would have to change ninety to googol, and the next number in the series after ninetysix would be googolplex.
you know the pattern squeak.
and yes the possible flaw is that ninety could be replaced by googol.
you could answer either: googol is a name of a number but it does not follow the same system of nomenclature as all the other numbers listed in the series
or
you could say the series is arbitrarily limited to numbers of two digits or less, which of course should have more fairly been mentioned in the presentation of the problem.
1) 96
I often struggle with the concept that I don’t deserve any of the good Hashem gives me
none of us deserve even a very small portion of the Good that Hashem does for us. He does it because he is an Ohaiv Chesed.
Kidney Stones Anyone?
no thank you, mr doe
sometimes pain can be significanly lessened by knowing what is causing it, and what to expect.
there is no pain from the stone leaving the body.
the pain referred to as “passing the stone” is a misnomer.
the pain is not caused by the movement of the stone. it is caused by pressure in the urinary tube behind the stone as the stone blocks the flow of urine from this tube into the bladder.
This prohibition, known as mashkim megulim, “uncovered beverages,” is recorded in the Talmud(3) and codified by the Rambam as halachah which we are to practice today. But the Shulchan Aruch, who starts by quoting the Rambam, concludes by ruling that this edict no longer applies.(4) Since poisonous snakes and reptiles are rarely found in populated areas nowadays, there is no longer any reason to forbid drinking an uncovered, unsupervised beverage. The basic halachah follows this opinion and one is no longer required to concern himself with this prohibition.(5)
3 Avodah Zarah 30a and Chulin 9b. The original source is a Mishnah in Terumos 8:4.
4 Y.D. 116:1, based on the view of Tosfos, Rashba and Tur.
5 Mishnah Berurah 160:23.
where in the Shulchan Aruch do we find that the matzav of fish and meat together is no longer a sakana?
what is the logic even (similar to that of venemous snakes not being common any longer) that meat-fish is no longer a sakana?
where are the studies by modern physicians that demonstrate that meat-fish is not dangerous?
all we have an assumption, not based on any investigation by modern medicine, that it is not dangerous, perhaps because they assume it to be merely an ancient superstition.
and even so, where can you find any statement in a medical journal or other medical media that it is not dangerous?
i imagine if you ask the majority of medical practioners whether or not eating shrimp can cloud your cerebral processes, they will answer no. we dont even know for sure in what sense meat-fish is a sakana, physically, spiritually or both.
i believe that is the difference between the repealing of the Takanah on uncovered water (some Poskim actually hold it still is in effect) and the still existent Takanah on meat-fish.
as far as i know it is generally called Barrett’s Esophagus not Esophagitis.
nothing can mimic its symptoms because it has no symptoms. the only symptoms are from gerd which is the cause of BE.
it is a pathological change (caused by long term gerd) that is diagnosed only by endoscopy and biopsy, never by symptoms.
its only significance is that it causes a slightly increased risk of esophageal cancer, so it requires monitoring and treatment of the gerd. the barrets esophagus itself is not treated, (and i dont think it can be reversed by treatment of the gerd).
yes 80 is the gematria of the letter pei
thats why moderator 80 chose it.
it is the gematria of the first letter of his name.
moderator 80 has resigned
but i am still checking in once in a while
I’m still here gavra. I believe Joseph is also
heres some of my favorites. not sure if they belong in a photography thread. more photoshop than photography
wolf
you need a debating refresher course
i said nothing about your position on the issues
as a matter of fact i tend to agree with you.
i was only commenting on a particular manner of approaching life that is so prevalent among Jews in modern liberal america
squeak
my point may be tangential to the particular issue being addressed here, but it is an extremely important and fundamental point that I felt needed to be pointed out, especially as it is an affliction among many of the more prolific posters here.
it is also probably a point made in vain, but i still feel obligated to make it.
I don’t think that being rude (yes, I call it rude when you purposely don’t greet someone) is what the Torah wants from us.
Therein lies the problem. People determining right and wrong from their “feelings” about what the Torah demands from us. What does a Talmid Chochom tell you that the Torah wants regarding this question. Not your “feelings” which are certainly derived in large part from the non Torah world, about what the Torah wants from us.
wolf
yes that’s true. i just meant to point out how the thinking of people not guided exclusively by the Eternal Holy Torah is so subtley and completely dominated by what we now call “political correctness”
probably 95% of americans would agree with wolfs position here (at least in public). it is certainly a most logical and “state of the art” position. throughout the thousands of years of history no one would have ever agreed with such a position, but now in modern society we all can agree with it.
What I’m against is the idea that you must follow him blindly regardless of qualifications.
Of course you dont have to follow anyone blindly or otherwise. However since i somewhat understand the “qualifications” of Gedolim, and certainly recognize my own glaring ignorance as compared to them, i am quite happy to follow their directives “blindly”
i didnt say Gedolim never made claims about their abilities. I said they were not wont to. They made such claims when it suited their purpose.
as to your second question, I am unable to satisfactorily answer you.
Gedolim in general are not wont to make claims about their natures, accomplishments or abilities. I have no doubt that their Neshomas are colorful 3-dimensional entities compared to my grey 1-dimensional dark existence.
I have no doubt the Chofetz Chaim, the Steipler, Rav Elyashuv and many others were and are aware of the world in far-reaching ways I cant imagine. I cant prove this to you.
and not that they possess the ability to divine and identify the underlying causes and nature of the tevva?
i certainly wouldnt agree with that. nor would the Chovos HaLevavos who states that they see without eyes and hear without ears, and many other descriptions of those who have achieved a certain Purity and Kedusha who can “see from one end of the earth to the other” in many Mussar Seforim (referring to those Talmedei Chochomim of earlier generations at least, but not just to Neveim)
not that your and my little minds have any idea what that really means
Tochacha is a Halachah ( however requiring such sensitivity that it is appropriate only in quite limited circumstances in our ignorant generation)
And it has always been our way of Gedolim, Rabbeim, other leaders, and concerned erliche Yiddim to protest againt public and widespread errors of Halachah and behavior, out of concern for those who are jeopardizing their Olam Ha Boh, and out of concern for the Honor of Hashem.
This has always been a foundation of Torah.
The other way is the way of the nations, from whom we have been commanded to separate ourselves.
youre right gavra
for whatever reason
if they have to go, they have to go
people making that decision though should just be aware that its not the best situation. if it can be avoided that would be best.