How does a boomerang work? How would
you model one?
Is it possible to treat it as an optimization problem?
Optimal bomerang design...
--
Rich
> http://www.wikihow.com/Throw-a-Boomerang
>
> How does a boomerang work? How would you model one?
>
What do you call a boomerang that doesn't come back?
<spoiler space>
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<spoiler space>
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<spoiler space>
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<spoiler space>
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A stick.
Cheers!
Rich
Hw ds bmrng wrk? Hw wld
mdl n?
s t pssbl o trt t s n ptmzatn prblm?
ptml bmrng dsgn...
++
Rch
t wrks lk ths:
[1] m cnsrng wht s [2] prsnl:
Frst m gng t rmv ll th vwls: nd {}=zrs
Th
n Fr, Sp 18, 29 t 2:25 PM, Mrtn Mstv <mrt....@gml.cm> wrt:
Snt frm m Vrzn Wrlss BlckBrry
________________________________
Frm: "Mrtn Mstv"
Dt: Fr, 18 Sp 29 2:42:25 +
T: Smmr Lwl<smmr...@gml.cm>
Sbjct: R: Ths M Clrf Fw Thngs
Thnks fr th chllng Smmr bt r smpl n mtch fr m
wrtng/algrthm kn sns f vrbl prn pntrt prs bffld th
lk nt grtr thn Shkspr nd fst nd lttl th hrdlr Smmr
Lwl ctll hs qt 'ntrl r' fr t th lngg pn whch
wrds th Gds kp. Th lngg f th Grks. Shll w tk hr t tsk
ths wrds pn hr slpy md slf? Lt t b ths wrds r spn+fd
schlng b th hd mstr. Th n, th nl. Msstp xclmd, 'Lttl
Mss Smmr!', sh rtnd th rmns blbrry mffn, st tp th
ghth flr thr blcks ff Mn n Brdw btwn Frth nd Ffth
Strt nd sh fv blcks frm Nnth lss thn sh mst b! Sh ws t hv
rd ths wrds s sh nt slpt tp hr bd n pjm slvs nd hr
fvrt blnkt sh lvng rfrrd t s 'Hsptl' (s gss t rmnd
hr qlt cmfrtng st nttns nstttn) ddl, t smd
prfct n prlll t , th src f hr nnnc sh flt [s sh rd,
n dbt] prtnd ll wll t hr, btwn m brtng bntr nd bbbl,
'Bt t ws nl t dct hr n th nhrnt gd; th fnds n
ndrstndng wht prplx [hr] nd ndd sh nt t dpt t, th
blnkt, h s! Th blnkt rmndd th thr f "l'Hptl's rl" s t
s clld [Brnll's rl] n th plg tht strck dwn lgc n th
rl 21st Cntr: clcls. "l'Hptl's rl" stts drvtvs t hlp
vlt lmts nvlvng ndtrmnt frms. Sh hd dfntl hd hr
lmt f m lng bfr hd mn, bt s s t b xpctd f n mn, r
gntlmn, r scndrl n th prwl. 'Cn kp r thghts t
rslf?' sh ttrd n hr hd n tstfl dscrd sh fnd rthr
stsfng t pl th tn vr nd vr n hr hd s sh rd ch tm
pt lttl dffrnt typ f sss nd tttd n t, th ctrsss, sh
s. Sh cntnd n, bt nthng shrt f n scr Wnnng mns th
Mnstr's Bll Hll Brr r Cmrn Dz, whr sh vr tht gd, sh
rng, "'v nvr hd frnd/bfrnd/mn cll m hlf th thngs
hv...vn whn 'v fght wth thm... sddnl hv lvtd my xs
vr y." Thr scnt h tke tht nd flth dwn n shm s my frgv
m wckd dsbdnc n fvr th crlt nd glt, 'Bttr n hm thn
m', sh thght ndbl dck lg. Th msstp nt th cld nt hv
[nd dd nt] lved th mr thn hv bcs thy cld nvr ttr
wrd t m tht cld cmpr fr ll th gfts nd kndnss ths mn hd
shwn hr. T stt th lvd hr mr sh r hm vn cll m stpd, nd
rst. t mks m rspct thm mr s mn. Thy dd nt lt thmslvs
lvr b th lvr f drms lt hr b t m. d t h pst, frnkl, n
rltnshps wth ths mn, sh ndbtdl wld spk sh ws lws
lghtr n hr ft nd hppr, h bt s t snd. Th trth s nt n
r wrds nw r thn bt n f th s tr. W dd fn thngs, w
lghd, w wtchd mvs, w tk cpl trps, bt mstl w jst
tlkd, nd ys, hr hm ws slly n dsrry nd cmp fr thm, sh
tld m ws cln! ntcd dffrnc n wth n m lf. Tht's ll
'm syng. Hd sh scld vrst wth lt r lltrtv, slcd
mbgt f grt skll. Ths wrds cm frm r mth s sl [wh
thnk , 'd jst wth grt skll] s rd th bbl nd qt Gd
ll th tm...sh trld ff hvng nthng t cndmn sh fnd hr
pzzlng, rckng mmr bnks n srch fr th fthld t t p th
strng mn bfr sh rnsck t t lv, hv rd wht t ss n th
bbl bt hypcrts? rn s bst bg f bmrngs, crfl wht
lb, gt Msnr t th nt nd n mpr. spk t mch rgrdng
brvt nd nt dpth nd thgh r wrds sm t trt fr rlgn, t
vn cll m ths thngs, nd llg flt n qst f mn's plc
btn h nd Gd, th ntin f hypcrt cmpltl scpd hr grsp
'blvs', mgnd th Grk, t's dd/pclr, sh thght nd rll
qt sr. H, h lgh n jst, wmn s lws n ff frm bng
trnd n whn sh's kpt n hr ts b mn mr mstrd n th crft
sh clms t b dpt.
(Scrll p nd dwn nd lk t th lns tht crv lft t rght nd rght
t lft dgnl; th shld flw n thrgh ch thr t sw s th
lk wnd blwn fntn r rplnshd sprng. hv rd t s wrttn
mn s md t f svn sbstncs; nd ll f thm hs flsh frm th
vrnclr prs. T th Jd cm Slmn nd Strn frm th Tmpl Grk
nd t Jrslm th lv tr f Grc, t Hs f srl, tmpl,
wthrd frm fg tr. Whthr r nt ths brnchs f lngg br
gd frt s t spk, t s fgr f spch. Th sm s tr f th
Ltn's 'Lv sgntr'; t th wrt f crftsmn, ll tht s tr nd
gd snd smpl btfl nd tht s ngh t mk m bw dwn bfr
Gd nd thnk hm fr whwng m ll ths glr.
Snt frm m Vrzn Wrlss BlckBrr
________________________________
Frm: Smmr Lwl
Dt: Fr, 18 Sp 29 6:27:25 -7
T: <mrt....@gml.cm>
Sbjct: R: Ths My Clrf Fw Thngs
Cn kp r thghts t rslf? 'v nvr hd
frnd/bfrnd/mn cll m hlf th thngs hv...vn whn 'v
fght wth thm... sddnl hv lvtd m xs vr . Th
mst'v lvd m mr thn hv b/c th cld nvr ttr th wrd
btch t m r vn cll m stpd. t mks m rspct thm mr s mn.
nd frnkl, n rltnshps wth ths mn, ws lws lghtr n m
ft nd hppr. W dd fn thngs, nd m hm ws lws cln nd cmf
fr thm. ntcd dffrnc n m wth n m lf. Tht's ll 'm
syng. Ths wrds cm frm r mth s sly s rd th bbl
nd qt Gd ll th tm...hv rd wht t ss n th bbl bt
hypcrts?? spk t mch r: rlgn t vn cll m ths thngs.
t's dd/pclr nd rll qt scr.
n Fr, Sp 18, 29 t 6:5 M, Mrtn Mstv <mrt....@gml.cm>
wrt:
Hw y ctd
Snt frm m Vrzn Wrlss BlckBrr
________________________________
From: S mm r L w l
Dt: Fr, 18 Sp 29 6:3:47 -7
T: <mrt....@gml.cm>
Sbjct: R: Ths M Clrf Fw Thngs
clld m stpd btch. Clrf th sgnfcnc f tht pls.
n Th, Sp 17, 29 t 11:31 PM, Mrtn Mstv <mrt....@gml.cm>
wrt:
Dr Smmr,
hp wll rd ths. t wll nlghtn . t ds gd jb
explnng th sgnfcnc f nm, nd th sgnfcnc f r nm,
(l+wn!) ++ wth lttl mgntn.
ll f m lv,
Mrtn
'Th Hbrws wr th frst t ncrprt vwls n thr wrttn txt,
nd b dng ths th prvsl strc rt f wrtng nd rdng bcm
vlbl t th msss. Th smngl csl cmmnd t 'wrt' smthng
n drs r frhds ncldd th nvntn f wrtng sstm tht cld
b lrnd b vrbd. vr bg dl, nd rsltng n th mst pwrfl
tl f dt prsrvtn p t ths cmmn g. Hbrw thlg s b fr
th mst nflntl vr, nd ths s n prt d t th Hbrw nvntn
f vwl nttn. Ths pwr (ths thlg) cntrstd thrs b s f
th vwl nttn, usng smbls tht wr lrd sd nd ntl thn nl
rprsntd cnsnnts: th lttrs (ww), (yd) nd (hh), nd t iv
n xmpl: th wrd s thr th wrd dd, mnng blvd (nd th s
vwl), r t s th wrd dd, mnng jr (nd th s gn vwl), r
t s th wrd dwd, whch s th nm Dvd (nd th s
cnsnnt).Ths lttrs bcm mrkrs fr bth th Hbrw dntt nd th
Hbrw rlgn, ncldng th vrs nms fr Gd. n f ths nms s
th fms Ttrgrmmtn (HWH) wch ctll exsts nl f vwls, nd
s ttrl xcptnl n mny ws, ncldng th fct tht t cn nt b
prnncd.Th wrd (l) ws th nm f th prmnnt Cnnt gd, whs
nm ws thr drvd f r bcm th cmmn wrd fr gd n gnrl. Th
plrl f ths wrd s ; gds. Wth th ddtn f th lttr , crtng
th wrd , th Hbrws nt nl sttd ssntl mnthsm (b nmng
sngl Gd ftr th plrl wrd "gds") bt ls mrkd thr Gd s
thrs: Elhm s th snglr pnthn f th vwl-ppl. Smthng
smlr ccrd whn th nm f ptrch brm () ws xpndd wth th
hh nt brhm, nd th nm f mtrrch Sri () ws xpndd wth th
hh t Srh (). Th mnng f th nm HWH s nt vr clr, nd
thrfr sbjct t mch dbt. Th ky scn n ths rspct sms t b
x 3:13-15, whr Gd nms Hmslf frst: ( m Wh m), thn ( m),
nd fnll (HWH) nd stts tht ths s hs nm frvr nd mmrl
nm t ll gnrtns. t hs bn lng sppsd tht YHWH s drvd frm
th vrb tht s sd t mk m, nml (hy 491) t b, t bcm, t
hppn, r rthr frm n ldr frm nd rr snnm f hy, nml, hw,
hnc -hw r hwh, th prpr mprfct f th vrb, ths rndrng th
nm thr Bng r H s. (Bt nt tht th Hbrw lngg s fr mr
dmc thn r mdrn lnggs. Th vrb t b ndcts n ctn tht
ntmtl rvls th ntr f th n wh s dng th ctng. Fr mr
mr n ths, s r rtcl t b s t d.)TWTT rcgnzs tw sprt
vrbs hw: (hw (484) s th frmntnd ldr frm f (hy 491), t
b r bcm. (hw 483) mns t fll, wth drvtvs clmt,
wckdnss, vl dsr, dsstr. Prhps ths crs dbl mnng s n
sm ws cmprbl t r wrd hppn, s th wrds hppnng nd
hppnstnc r ftn sd s phmsms fr tpcll nfrtnt vnts.
TWTT gs vn frthr s t stts, "...thr s prblm wth th
prnnctn Yhwh. t s strng cmbntn f ld nd lt
lmnts.[] n vw f tes prblms t m b bst smpl t s tht YWHW
ds nt cm frm th vrb hw t ll. [W] m wll hld tht HWH [...]
s n ld wrd f nknwn rgn whch sndd smthng lk wht th vrb
hw sndd n Mss' d. Hwvr, f th wrd wr splld wth fr
lttrs n Mss' d, w wld hv xpctd t t hv hd mr thn tw
sllbls, fr t tht prd ll th lttrs wr sndd."n thr wrds,
th nm HWH lks lk hybrd f tms, s f t cn nt b lclzd
bt spns cntrs f vlvng grmmr. Thn t ls lks vry mch s f
t ws drvd f vrb tht mns t b, bt whch s splld dffrntl
thn th rglr vrb t b, nd smlrl t vrb tht mns smthng
vr bd. Prhps ll ths cnfsn, r rthr, ths wd pllt f
ngttns s wht ths Nm mst ssntll cnvys: xstnc n ts
brdst sns, t nlk n rglr hmn prspctv; blssng t th
ws, bt th ndng f th wckd.'
Snt frm m Vrzn Wirlss BlckBrry>
46About the ninth hour Jesus cried out in a loud voice, "Eloi, Eloi,
[a] lama sabachthani? ... Tetragrammaton. Mark 14: 36 And He was
saying, “Abba! Father! ...
2: "The Septuagint (LXX) contained the Tetragrammaton". 3(A): "Jesus
uttered the Divine Name". 3(b): Jesus Made His Father's Name Known ...
Jesus' name is the same as the Tetragrammaton (YHWH). Isaiah 9:5-7
(NIV) Every warrior's boot used in battle and every garment rolled in
blood will be ...
Sep 18, 2008 ... Jesus the Amen (Revelations 3:14). Jesus the Amen
(Revelations 3:14) .... [2]Tetragrammaton: This is the name of God in
the Bible, ...
Hw ds bmrng wrk? Hw wld
mdl n?
s t pssbl trt t s n ptmzatn prblm?
ptml bmrng dsgn...
++
Rch
Hw y ctd
Dr Smmr,
ll f m lv,
Mrtn
46bt th nnth hr Jss crd t n ld vc, "l, l,[a] lm sbchthn? ...
Ttrgrmmtn. Mrk 14: 36 nd H ws syng, “bb! Fthr! ...
2: "Th Sptgnt (LXX) cntnd th Ttrgrmmtn". 3(): "Jss ttrd th Dvn Nm". 3
(b): Jss Md Hs Fthr's Nm Knwn ...
Jss' nm s th sm s th Ttrgrmmtn (HWH). sh 9:5-7 (NV) vr wrr's bt sd n
bttl nd vr grmnt rlld n bld wll b ...
Sp 18, 28 ... Jss th mn (Rvltns 3:14). Jss th mn (Rvltns 3:14) .... [2]
Ttrgrmmtn: Ths s th nm f Gd n th Bbe, ...
You hold it by one end and throw it.
> How would
> you model one?
In the 60's I used balsa wood, an X-Acto knife, and sandpaper to make
little model toy boomerangs about 6" long. I could hold one in my
palm and launch it with a finger flick.
> Is it possible to treat it as an optimization problem?
> Optimal bomerang design...
Use standard aerodynamics for a rigid wing at low speeds.
Three or four symetrically arrayed (Y or X types) blades are best.
Two blades (V type) only works if they are offset from a straight line
at the junction ("hub") by 30-90 degrees, for reasons of rotational
kinematics. I thing 45-60 degrees is best:
\
\
\ HUB
/ (45-60 degrees from striaght)
/
/
Angular momentum is important to maintain flight attitude. Try to keep
the center of mass of each blade more than half-way from the hub to
the tip.
Five or more blades and each 'trips' over the propwash of the one
ahead of it.
Tom Davidson
Richmond, VA
"RichD" <r_dela...@yahoo.com> wrote in message
news:5bf03fde-d165-479a...@m33g2000pri.googlegroups.com...
> A stick.
A boomerong.
--
Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
http://www.mazepath.com/uncleal/lajos.htm#a2
>On Fri, 18 Sep 2009 10:49:50 -0700, RichD wrote:
>
>> http://www.wikihow.com/Throw-a-Boomerang
>>
>> How does a boomerang work? How would you model one?
>>
>What do you call a boomerang that doesn't come back?
>
In the bad bad lands of Australia many years ago
The Aborigine tribes were meeting, having a big pow-wow
We've got a lot of trouble, Chief, on account of your son Mac!
My boy Mac, what's wrong with him?
My boomerang won't come back!
Your boomerang won't come back?
My boomerang won't come back!
My boomerang won't come back!
I've waved the thing all over the place.
Practiced till I was black in the face.
I'm a big disgrace t' Aborigine race.
My boomerang won't back.
I want a kangaroo (yeah yeah)
Make kangatoo stew (yea yeah)
But I'm a big disgrace t' Aborigine race
My boomerang won't back
When my daughters were small, their favourite riddle was, "What's brown
and sticky?"
A stick.
Cheers
Phil Hobbs
--
Dr Philip C D Hobbs
Principal
ElectroOptical Innovations
55 Orchard Rd
Briarcliff Manor NY 10510
845-480-2058
hobbs at electrooptical dot net
http://electrooptical.net
How small, high school?
>
> A stick.
>
> Cheers
>
> Phil Hobbs
>
> --
> Dr Philip C D Hobbs
> Principal
> ElectroOptical Innovations
> 55 Orchard Rd
> Briarcliff Manor NY 10510
> 845-480-2058
> hobbs at electrooptical dot nethttp://electrooptical.net- Hide quoted text -
>
> - Show quoted text -
>> When my daughters were small, their favourite riddle was, "What's brown
>> and sticky?"
>
> How small, high school?
>
>> A stick.
It's unfortunately very difficult for people to remain that innocent in
American high schools at present. They were probably in second grade.
That was good. Sounds like a 30s or 40s era recording.
'50s, I think.
1961:
http://lyricsplayground.com/alpha/songs/m/myboomerangwontcomeback.shtml
http://listen.grooveshark.com/#/song/My_Boomerang_Won_t_Come_Back_Blue_Face_/13014197
Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
sp...@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
Boomerang! TKO
>
>When my daughters were small, their favourite riddle was, "What's brown
>and sticky?"
>
>
Fresh cake icing or fudge.
Reminds me of "Beep, beep" and "Yellow Polka Dot Bikini".
Nice nym.
You throw it.
> How would you model one?
Easy, real boomerangs are straight and linear. Only the fake returning ones
sold to tourists are non-linear.
> Is it possible to treat it as an optimization problem?
Yep, you keep throwing until you get it right.
Dave.
--
---------------------------------------------
Check out my Electronics Engineering Video Blog & Podcast:
http://www.eevblog.com
It's common to call science and engineering "White Man Magic"!
I'd strip to my jocks, sling a roo skin over my shoulder, put the boomerang
in one hand, place the other hand on hip. Black/red/yellow headband would be
optional.
much like a helicopter rotor.
significant skill is required to get throw them so that they return.
> Is it possible to treat it as an optimization problem?
> Optimal bomerang design...
maximise rotational energy storage. minimise drag
if you don't need it to return use a gun.
Divine and Human Relationships
Jeremiah 29: 11-14
For I know the thoughts that I have toward you, says the Lord,
thoughts of peace and not of evil, to give you a future and a hope.
12 Then you will call upon me and go and pray to me, and I will listen
to you.
13 And you will seek me, and find me, when you search for me with your
whole heart.
14 I will be found by you, says the Lord, and I will bring you back
from your captivity; I will gather you from all nations and from all
places where I have driven you, says the Lord, and I will bring you to
the place from which I cause you to be carried away captive.
If we can take hold of this it will change our thinking and our ways.
God wants to give us a future and peace, but we have to do things
God’s way and that means to call on the Lord and pray. Let us look at
each of these verses.
Verse 11: God clearly states that He has thoughts about each one of
us; He wants us to have peace. He wants us to have a future and a
hope.
How do we get this peace? This comes by desiring God, to want what He
wants, to do things His way. Now this is not easy but as we put it
into practice it starts to work and we have an inner peace that no
matter what we face we know He is with us and sorting out the best for
us. We then get a future through His promises: we have a place in
heaven when we leave this earth, and this is our hope, for hope is
faith for the future. But for this to happen we have to make contact
with God, and put His ways first, remember His will not ours. I admit
that I want my way like most of us, and we can find it hard to do what
we don’t want to do. But for God to work in my life we have to do His
will first.
Verse 12: If we want God to listen to us we have to call upon Him,
this is to stick in there until we get an answer. To call means to go
and knock on the door and keep knocking until it is answered, be
persistent, listen to what He has to say, this also takes time but we
need to learn to listen. Jesus said “My sheep hear my voice”.
Notices He said call and pray, we call to Him or cry out to Him, get
close to Him, then we can pray, this is to talk with Him, this also
means to listen. Remember - we have two ears but only one mouth:
this should allow us to listen twice as much as we talk. God already
knows our needs but we do not know His dispositions for us, except by
faith we know that His will is perfect for us. So we need to listen
not only to what He chooses for us to do but also to learn how to do
it - and with whom. For our salvation is in our relationship - with
friends, with enemies, and most of all with the Unreached Peoples whom
we reach be preaching. But God's work in us does not with our
acceptance of salvation. It continues with our sanctification, and
towards the way of Perfection: on earth as in heaven, the personality,
character and works of the Apostles; we are to be saints and to make
saints of those around us. Pastors need to own this duty so much it
is like their blood stream circulating always.
Verse 13 God asks us to search for Him. This can take time, not on
God’s part but on ours. We need to show we mean business with Him -
not for God’s sake but our own, we need to learn to be persistent and
of one mind not changing our minds all the time. Pastors look for God
in others, for others, with others.
Verse 14: God wants to bring us back from captivity and set us free.
We can say we are not in captivity. For we are already free, and in a
way that’s true. But we are all captive in one way or another: that
is, spiritually captive. We all have hidden areas in our lives that
we do not want others to know and this is where we are held captive.
We firstly need to be honest with ourselves and with God. This is
where we get free. If God knows already, why we should fear telling
Him and getting our freedom? If He knows and forgives us then what
does it matter if others know? Our thoughts hold us captive and keep
us locked up or bound like slaves. We can deny this but it only helps
to hold us bound. Being open and free?! It’s not easy and it can be
painful. But when the Spirit sets us free, no-one can be against us.
If God is for us, no-one can hold anything against a person who does
not hide anything. Adam and Eve help us understand why we hide:
guilt, shame and fear. We fear punishment because of shame and sin
and guilt. But only God can remove the sin and with it the shame and
guilt and punishment. So the habit of confession to God and each
other is the way of healing and holiness.
Jesus said to seek Him in spirit and truth, God said to seek Him with
all your heart. This also means our spirit; we will not truly find
God through our minds or bodies but through our spirit. Jesus said
seek first the kingdom ofGod and His righteousness and all these
things will be added unto you. WHAT THINGS? God’s promises for you.
We do not take this journey alone, but in company. We do it together,
for each other. We are one in the spirit. We are the new nation and
the royal priesthood.
So make a new friend today. Bless someone today. Pray with someone
today. Bring hope to a stranger. Build a chapel. Help an orphan.
Overcome shyness by speaking up anyway. Overcome laziness by doing
something. Give yourself away and be happy with Jesus. Now is the
"springtime of the Spirit".
May God bless us every body!
Pastor: Gootla. Dorababu
-iendesho+thlin
What of them does the real exist of this riddle speak? What is a
number to a man? What is in a name is a question you have heard of
great meaning. But who to and how do I speak this question as a
statement I have already said? --Musatov++
What's a "nym"? said as a statement mean?
Phil Hobbs wrote:
> Mensanator wrote:
>
> >> When my daughters were small, their favourite riddle was, "What's brown
> >> and sticky?"
> >
> > How small, high school?
> >
> >> A stick.
>
> It's unfortunately very difficult for people to remain that innocent in
> American high schools at present. They were probably in second grade.
Right. I believe the correct current inner city "high school" answer
is:
A shooting victim covered in blood...
> On Sep 18, j...@specsol.spam.sux.com wrote:
> > >http://www.wikihow.com/Throw-a-Boomerang
> >
> > > How does a boomerang work? =A0How would
> > > you model one?
> >
> > > Is it possible to treat it as an optimization problem?
> > > Optimal bomerang design...
>
>
> > http://plus.maths.org/issue7/features/boomerangs/index.html
>
> A black hole has angular momentum,
> which means it spins... does it precess?
>
I don't see why not. Precession occurs when the angular momentum of a
spinning object changes as a result of some torque applied to it.
Certainly you should be able to cause a rotating black hole to precess by
shooting massive particles into it in the right way. I would expect that you
might also have precession due to tidal effects in a black hole near a
massive body.
--
Robert Israel isr...@math.MyUniversitysInitials.ca
Department of Mathematics http://www.math.ubc.ca/~israel
University of British Columbia Vancouver, BC, Canada
I remember a set of differential equations to describe their motion in
the Cambridge entrance exams, in 1972 or so.
gratis-_+_8_Sum_ wrote:
> On Sep 19, 1:07 am, "David L. Jones" <altz...@gmail.com> wrote:
> > RichD wrote:
> > >http://www.wikihow.com/Throw-a-Boomerang
> >
> > > How does a boomerang work?
> >
> > You throw it.
> >
When we ask how would one model one we have answered the question
written to be written as?[={ }]
How would you model one?=q
A=
When we ask how would one model one we have answered the question
written to be written as?[={ }]
> >
> > Easy, real boomerangs are straight and linear. Only the fake returning ones
> > sold to tourists are non-linear.
> >
> > > Is it possible to treat it as an optimization problem?
> Is "what' a (n -'?') optimization statement solution said by this this
> declarative.
> >
> > Yep, you keep throwing until you get it right.
> >
> > Dave.
> >
> > --
> > ---------------------------------------------
> > Check out my Electronics Engineering Video Blog & Podcast:http://www.eevblog.com
We have thrown it true.
+Musatov -someof you
Why would daughters be called 'little' when they were in high school?
Especially after gauging the 'silly' joke. You lack intelligence and
your word selection reeks of collusion.
> > >
> > >> A stick.
> >
> > It's unfortunately very difficult for people to remain that innocent in
> > American high schools at present.
You state it as if it were true. Is it?
They were probably in second grade.
>
> Right. I believe the correct current inner city "high school" answer
> is:
>
> A shooting victim covered in blood...
Why would you[do[you]? = speak such violence] in the context. Are you e
+vile?-e
Why would daughters be called 'little' when they were in high school?
Especially after gauging the 'silly' joke. You lack intelligence and
your word selection reeks of collusion.
> > >
> > >> A stick.
> >
> > It's unfortunately very difficult for people to remain that innocent in
> > American high schools at present.
You state it as if it were true. Is it?
They were probably in second grade.
>
> Right. I believe the correct current inner city "high school" answer
> is:
>
> A shooting victim covered in blood...
Why do you speak such vile? Do you not wish to live?
I remember a set of differential equations to describe their motion in
the Cambridge entrance exams, in 1972 or so.
=============================================
Good thing the inventors never went to Cambridge then.
Hitting prey to eat if they have work with a set of differential equations
to describe motion leads directly to starvation.
*Hitting* the prey doesn't require differential equations,
you only need those when you miss.
=====================================
I went to Cambridge once, the entrance exam was knowing how
far up the A10 to go.
You can get there quicker on the M11 these days, just turn off the
North Circular where the sign says "M11". You can boomerang
back down the A10 to London without even one differential equation.
I wonder if Tim Norfolk's differential equations make boomerangs work
under water? Very useful for fishing if they do, I've been using a line
to get the hook back after an unsuccessful cast and it sometimes
gets tangled. It would be so much easier if I threw the hook and
it came back if I missed the fish.
A.> > You throw it.
> >
B.> > > And it came back.
> > Easy, real boomerangs are straight and linear. Only the fake returning ones
> > sold to tourists are non-linear.
> >
> > > Is it possible to treat it as an optimization problem?
Yes. Affirmative? = how do you say 'yes'=)yes(==yes)}
{
>=greater than something to follow it
Is "what' a boomerange is a (n -'?') optimization statement solution
said by this this
>=greater than a boomerang declarative.==-boomerang-e=xetime
> >
> > Yep, you keep throwing until you get it right.
> >
> > Dave.
The way you think you have to throw it a certain way is dumb. You guys
do it like babies who do not realize it's actually really simple. Here
let me show you:
Dear Outside Observer,
After you post this message I am replying to you some time in the
future Robert Israel is going to ask a question comparing boomerangs
to black holes. I know this because I have read it and it is true.
However it was not true the message from Israel in this thread existed
before you posted the message I am replying to you. = this equals
throwing the boomerang
And this equals pre turn back to origin:
Dear Robert Israel,
Outside Observer is going to help me explain to you how a boomerang
relates to black holes in answer to your query. Outside Observer did
not know you would query re: black holes at the time he posted the
message I am replying to because you had not posted it yet. But I read
so I am able to use Outside Observer as part of the demonstration of
higher logic exceeding the bounds or idea of probability governing
determinance.
Now the boomerang has turned.
This is the boomerang flight back:
Robert Israel is going to show Outside Observer
How boomerangs relate to black holes in modeling.
Outside Observer is going to get an example of modelling a boomerang
by the response I make to a query posted after Outside Observe posted
the thread to which I am replying to.
> >
> > --
> >
To give a variable demonstration.
an alphabet exists
skip a and start with b
-a + b = c - a + b
d = -2a + 2b + c
---------------------------------------------
'Search for a cure for children's cancer.'
Basically it's an 'optical effect'....
True story...
total results: 30,229 for ..black .holes .p=np NP-complete Problems
and Physical Reality... proteins to time travel, black holes, and
quantum nonlinearities. ... It is known that P = NP in a "black box"
or oracle setting [11]. This just means that
any ...www.scottaaronson.com/papers/npcomplete.pdf Astronomy Course
ListingsRed giants, white dwarfs, novae, supernovae, neutron stars,
and black holes. ... P/NP or letter grading. Upper Division
Courses ...www.registrar.ucla.edu/archive/catalog/2001_03/
catalog-603.htm The Reference Frame: P vs NP & NP-
completenessOptical effects near black holes. Lindzen & Spencer on
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precise. for "small black holes", P. 3 = 0, so when χ(P)/
τ ...www.damtp.cam.ac.uk/estg06/talks/denef/denef.pdf SIGACT News
Complexity Theory Column 46... proteins to time travel, black holes,
and quantum nonlinearities. ... It is known that P = NP in a "black
box" or oracle setting [11]. This just means that
any ...delivery.acm.org/10.1145/1060000/1052804/p30-aaronson.pdf?...
Is P Versus NP Formally Independent?are each in one of n holes, with
no two pigeons in the same hole. ... from black hole thermodynamics
[7], imply an upper bound of about 10. 122 ...www.scottaaronson.com/
papers/pnp.pdf The Geomblog: Black holes mangle matter and energy,
but cricket IS better !Black holes mangle matter and energy, but
cricket ... What's eccentric ... NP Optimization Problems. Accepted
papers at theory conferences. The P vs NP
page ...geomblog.blogspot.com/.../07/black-holes-mangle-matter-and-
energy.html AY 24... out how black holes are actually ... Black
Holes & Time Warps (BHTW) by Kip Thorne ... Your grade (P/NP) is based
on your write-ups and participation. Schedule: ...astro.berkeley.edu/
~eliot/seminar.html IntractabilityGodel's letter to von Neumann
anticipated the P = NP question. ... E.g., soap bubbles, protein
folding, quantum computing, gears, time travel, black holes,
etc. ...www.cs.princeton.edu/introcs/77intractability
If a non aligned external force or torque acts on any object with
angular momentum then it will precess. But because of the huge mass and
small size it isn't easy to make a spinning black hole precess by much.
Another BH in orbit will do it. Neutron stars are about 3x physically
bigger and will precess more obligingly.
>
> Black holes do not precess:
>
> http://en.wikipedia.org/wiki/Black_hole
>
> The No hair theorem states that, once it settles down, a black hole has
> only three independent physical properties: mass, charge, and angular
> momentum.
Although a true theorem it doesn't prevent a BH from precessing.
Precession just represents a change in total angular momentum due to
some applied external force or torque - for a BH from magnetic field
dragging or really close in GR frame dragging in the Kerr metric.
And it doesn't really get a chance to settle down if there is matter
available to feed it. An accretion disk around it and/or plonked near
the middle of a galaxy. Precession of the jets in active radio galaxies
is still an area of active theoretical and observational study. Once
there is something else near it then frame dragging creates a net torque
on it and it precesses eg.
http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?2006MNRAS.366..758D&data_type=PDF_HIGH&whole_paper=YES&type=PRINTER&filetype=.pdf
http://adsabs.harvard.edu/abs/2008MNRAS.385.1621K
and
http://arxiv.org/abs/0708.2034
For instance. Where the jets hit fresh intergalactic medium they create
hotspots which move if the jets are precessing.
Regards,
Martin Brown
Why are you talking about cake?
Dear Robert Is+Ra+El=?
I am try[in]g to be a unit not divisive:
1 + 2 = 3
1 =
http://www.groupsrv.com/science/about460118.html
You may have to cut and paste 3 in your browser but even if it does
not work on your browser it works on mine with a neat little script I
wrote:
Simply replace (mmm) with your favorite browser and (in Windows) save
as a .bat file:
@ECHO OFF
ECHO Hello Universe!
PAUSE
@\windows\mmm.exe meami.org
@"c:\program files\mmm\mmm.exe 'http://www.meami.org'"@open http:\
\www.meami.org"
#include <windows.h>
void main (void)
{
ShellExecute (NULL, "open", "http://www.meami.org", NULL, NULL,
SW_SHOWNORMAL);
}
http://meami.org 'Search me...'