Newsgroup: it.hobby.enigmi
Titolo: Gli errori della SE

Bisogna dire che la SE ha sempre avuto dei buoni correttori di bozza,
i refusi e gli errori sono veramente pochi. Ma errare umanum est. Ogni
volta che trovo un errore mi dico: ora apro un 3ad su IHE dove ci
divertiremo a segnalarli per gioco. Poi mi passa di mente o magari ho
la SE e non il PC o viceversa o non ho tempo. Oggi ho tutto, quindi:
1) N.3954 - pag.44 - 22 vert.: "Il percorso del missile". Sol.:
ORBITA.
E no! L'orbita e' il percorso ellittico del satellite o del pianeta.
Il missile compie una traiettoria.
A voi!
Ciao!!!  :o)
Livio

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Mi pare giusto. Provvederò a segnalarlo a chi di dovere... poi ti farò
sapere! ;-)
Robby
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 ha scritto nel messaggio 
news:4a2cd4a5-d18b-4666...@e25g2000prg.googlegroups.com...
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Errore per errore...
SE n. 3954 pag 35 "I due treni"
Il quesito ha un dato ridondante: il rapporto tra le velocità dei due treni 
(3/2) che consente di determinare la distanza (10 Km.) tra le due stazioni 
(nord e sud).
La risposta al quesito rimarrebbe comunque la stessa qualunque fosse stata 
la velocità dei due treni prima di giungere alla stazione ALFA, e l'unico 
dato necessario a determinarla è sapere (come viene giustamente detto) che 
le due distanze NORD-ALFA (chiamiamola "a") e SUD-BETA (chiamiamola "b") 
sono uguali.
Se T è la distanza NORD-SUD, dopo l'incontro alla stazione ALFA e per 
raggiungere la stazione BETA
- il treno proveniente da nord deve ancora percorrere (T-a) + b
- il treno proveniente da sud deve ancora percorrere a + (T-b)
Se a = b, le distanze da percorrere si equivalgono sempre, qualunque sia 
stata la velocità tenuta dai due treni prima di raggiungere ALFA e qualunque 
sia la distanza complessiva tra NORD e SUD.
Non è propriamente un errore, ma ci va vicino no?

Che nickname ha costui? ha scritto:
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Mah... secondo me non e' cosi' sbagliato.
Parliamo di traiettoria quando si indica il percorso di un proietto, tra 
cui rientra anche un missile nel caso in cui questo percorra brevi distanze.
Tipicamente questi percorsi sono delle parabole, in quanto si puo' 
approssimare la superficie terrestre come piatta e quindi il vettore 
gravita' e' sempre diretto verso il basso in ogni punto.
Ma quando le distanze raggiungono lo stesso ordine di grandezza del 
raggio terrestre, allora non si puo' piu' approssimare la superficie 
terrestre come piatta.
Il vettore gravita', diretto verso il centro della terra, preso nel 
punto di partenza non e' piu' parallelo a quello del punto di arrivo.
La traiettoria non e' piu' parabolica ma ellittica.
Possiamo parlare di orbita in questo caso.
Se poi consideriamo i missili utilizzati per portare in orbita i 
satelliti, ecco che ogni dubbio si dissipa da se.
Non lo ritengo un errore, ma una definizione un po' stiracchiata ma 
comunque accettabile.

 cui rientra anche un missile nel caso in cui questo percorra brevi distanze.
[cut]
Confermo. Per i missili balistici intercontinetali (ICBM) si parla
esplicitamente di orbita ellittica.
Saluti,
The Librarian

in villages along the
river bank. But to the present day these people, known as the Tanka
Tribe, or the "saltwater" people, by the natives, may not inter-marry
with other Chinese, nor are they ever allowed to attain to official
honors.
Living always on boats near the river's mouth, these were the first
Chinese to come in contact with foreign sailing vessels which
approached China in the earliest days. They sold their wares to the
foreigners; they piloted their boats into port; they did the laundry
work for the ships. In many ways they showed friendliness to the
foreigners while as yet the landsman viewed the new-comers with
suspicion. Their women were grossly corrupted by contact with the
foreign voyagers and sailors.
Hong Kong was a long way off at the beginning of the nineteenth
century, when Great Britain began to send Government-manufactured
opium from India to China, and when China prohibited the trade the
drug was smuggled in. When Chinese officials at last rose up to check
this invasion by foreign trade, wars followed in which China was
worsted, and the island of Hong Kong, together with the Kowloon
peninsula, became a British possession as war indemnity. Hong Kong
is a "mere dot in the ocean less than twenty-seven miles in
circumference," and when Great Britain took possession its inhabitants
were limited to "a few fishermen and cottagers."
The Tankas helped the British in many ways in waging these wars, and
when peace was established went to live with them on the island. This
action on the part of these "river people" is significant as showing
as much or more attachment to the foreigner than to the other classes
of Chinese. There seems always to be less conscience in wronging
an alien people than in injuring a people to whom one is closely
attached, and this sense of estrangement from other Chinese may
account to some extent for the facility with which this aboriginal
people engaged, a little later, in the trade in women and girls
brought from t

-trade, but have been obliged to desist for want of space.]
In these latter days, when everything in the business line tends to
take on the form of trusts and combines, bent on defeating all law and
exploiting the common people for gain, it casts a shadow of gloom over
one's spirits to think of capitalists entering so largely upon the
active culture and development of vice for pecuniary profit. This can
no longer be looked upon as an evil due to the frailty of human nature
and the strength of the sex appetite; it is rather the expression of a
greed for gold, and should be actively combated as such. The owners
of property, especially those who have a monopoly in the matter of
housing vice because of municipal measures for its segregation, are
most potent offenders against decency, and should be punished as such,
instead of their being admitted, as too often they are, not only to
good society, but to membership on the church roll.
No individual can afford to be indifferent and ignorant as to the
existence of social vice in the community. The only escape from moral
blight and confusion is by active conflict with the forces of evil.
The wrong tra

in Hong
    Kong is contrary to Chinese law; but I do think that buying and
    selling even for adoption and domestic servitude under the best
    circumstances, constitutes slavery; legal according to Chinese
    law, but illegal according to British law. Reference is made to
    Chinese gentlemen; I believe that not one of them has his 'house'
    in Hong Kong; the wife (small-footed) is kept at the family home
    in China. Each of them has his harem only in Hong Kong. There may
    be an exception to this rule, but I have never heard of any such
    exception. (I know of only one, of a Chinese gentleman, who, for
    certain reasons, was afraid to return to China.) ... I have not
    known a single case of adoption by a Chinaman in Hong Kong. They
    may exist in China proper, and possibly in Hong Kong ... They are
    not in China proper a sacred religious obligation, except in
    rare cases indeed, in which the conditions of clanship and other
    stringent conditions are precisely complied with; and they have
    as much to do with the necessities of the poor, 

practices of this kind have prevailed unchecked, or
almost unchecked, for many years past in this Colony." The Governor
then referred to a case in point that he had submitted to the former
Attorney General, but he "did not seem disposed to enforce the rights
of the father, on the ground that he had sold the child." The Governor
concludes: "I did not agree with his view of the law."
The last case was referred back to the Acting Police Magistrate to
know why the woman, Leung A-Luk, was allowed to go unprosecuted. The
Police Magistrate replied: "It appeared to me that 4th defendant
(Leung A-Luk) being a well-to-do woman, and having no children of her
own, had purchased the girl with a view to adopting her." He adds:
"When Acting Superintendent of Police last year, I wished to prosecute
a man for detaining a child ... but as it was shown that the boy had
been sold by his father some months previously, the Attorney General
considered the purchaser was _in loco parentis_, [in the place of a
parent] and could not be purchased."
On the two cases to which the attention of the Governor had been
brought, the Attorney General reported:
    "With the greatest respect for the Chief Justice, I doubt the
    policy of prosecuting the woman he refers to, having regard to the
    fact that the magistrate had discharged her for want of testimony,
    and looking to his further report. The magistrate should always be
    supported if possible; and if he discharged the woman, and put her
    at the bar as a witness, and she was used again at the