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Fuerza de Arrastre

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Modelo de Friccion

Resumen Final Física I

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Al g ui e nmepu ed ea y u da rc o ne s t o spr o bl e ma ma sde fi s i c a? el pr i mer oe sdepot enc i ayl osdemass ondet r ans f er enc i adeener gi ac al or i fi c a.por f a vor a yi denmes ol ot engoel r es ul t a doper one ces i t oel pr oc edi mi ent oA)Cal c ul ens el osc abal l osd f u er z ap r ome di o( p ot e nc i a)r e qu er i d ospa r al e v ant aru nt ambo rd e1 50k gau naal t ur ade20 u nt i emp od eu n1. 0mi mi nu t oR=. . .mo s t r a rmá s Se gu i r 1r e sp ue s t a No t i fi c ara bu so

Respuest as

Mej orr espuest a:A)Ca l c u l e mo mo sl apo t e nc i aenMK MKS=>Wa Wa t t sys i c o ns i d er a mo mo sl o sc ab a

def uer z adel s i s t emai n gl ést endr emos : 1HP( hor sepower )=745. 7W ( Ene ls i s t emat é cni c ot a mbi mb é ns eus ael CVoc a ba l l ov a po r : 1CV=75kgm/ s=735. 5W) W) P=pot enc i amedi a=t r abaj o/t i empo=W /t=( Fh ) / t=F( h/ t )=Fv d on de : W =t r abaj ot ot al ; h=al t ur aal aques eel e v ael t amb or ; t=t i empot ot al ; W =Fh  Sign up to vote ons this title F=f u er z aaa pl i c a rs o br ee lt a mb mb or=c o mo momí n i moi g ua le ni n t e n s i d ada upe s op er od e s ent i doc ont r ar i o;  Useful  Not useful F=m g( enmó módul o)

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Fuerza de Arrastre

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Modelo de Friccion


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P[ HP]=490W /745. 7W/ HP=0. 657HP ============================== ( q uer e do nd ea doal as e gu nd ac i f r ade c i ma ld al ami s mar e s pu es t apr o pu es t a=>0 . 6 6h p) ( HPóhpesl omi s mo ,adi f er e nc i adel MKSys us i mb ol o gí ai n t e r na ci o na lmá ses t r i c t asep u e sc r i bi re nma y ús c ul aomi n ús c ul a ) obi e n P[ CV]=490W /735. 5CV/ W =0. 666CV ============================== ==0==

B)Sól onosi nt er es ael gr adi ent edet emper at ur ayc ons ec uenc i at r ans f er enc i adec al orat r a v é d el v i d r i oi gn or a nd ol ac on v ec c i ó ne nl as ub ca pal ami n are nc on t a ct oc onc ad as u pe r fi c i e ex t er nadel v i dr i o. P=Q /t=k TA( θ2 θ 1) / e obi en: Q =k TA[( T2T1)/e]t

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d on deel fl uj odec al orp oru ni d addet i emp oe sun apo t e nc i apo rc ua nt oese ner g í aporu ni da d Download With Free Trial d et i emp o; θ=t emp er a t u r aengr a do sCe l s i u s ; T=t emp er t u r ae nKe l v i n ; θ2-θ1=di f er enc i adet emper at ur asi nt er nae xt er na=T2T1 yademás: ∆T/ e=di f .det emp. / es pes or=gr adi ent edet emper at ur a;  t=t i e mp o=1h( p or q ued i c e" c a dah or a "a u nq uel u eg oh a b l ed eu dí a ) Sign up ton vote on this title

 Q /1 h=0 . 8 4W/ ( Km)×0. 8 m ×0. 4m ( 1 8-0 ) K/0 . 0 0 3m

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==0== C)Ess i mi l aral ant er i or : 1º )obt enemosl acant i daddecal ort r ans mi t i da; 2 º )d et er mi n amo sc onel c al o rl a t e nt edev ap or i z ac i ó nd el a gu ac uá nt osgr amo ss ee v ap or a n P=k TA( T2 T1 ) / e=>P/ A=k T( T2 T1 ) / e P/A=Q/ ( hc m² )=[4 2W/ ( Km)×10 0 K/0 . 0 0 2m ]×0 . 0 0 01m² / c m² =21 0W/ c m²=2 10J / s×36 00s / h/c m²=75 6k J/ ( hc m² ) El c al orl at ent edev apor i z ac i ónapr es i ónat mos f ér i c adel aguaes : L v=5 39k c al / k g=2 25 3k J / k g ent onc es : Q =Lvm =>m =Q/Lv oent ér mi nosdefluj ohor ar i oporc m² :

You're Reading aJ Preview m /( hc m² )=Φ=(Q /hc m²)/L v= ( 7 56k J/2 25 3k / k g )/hc m² Unlock full access with a free trial.

Φ=0 . 3 36k g/( hc m² ) c al c u l e sel ap ot en ci age ne r ad ap oru nama qui n aq uel e v an t au nac aj ad e5 00 k ga t r a v ez

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d eu n aa l t u r ad e2 0 me nunt i e mp ode6 0s

m =masadel acaj a=500kg g=a c el e r a c i ó nd eg r a v e da d=9 , 8m/ s ^ 2 h=al t ur aal ac ual s el e v ant al ac aj a=20m t=t i e mp oq uede mor aenl e v a nt a r l a=6 0s . . . . . . . 50k g.9, 8m/ s ^ 2.20m

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Fuerza de Arrastre

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Si h ac e sundi a gr a made la ut oenel p l a noi n c l i n ad o,t eda sc ue nt aqu eα=θ+9 0°d on deθ el ángul odei nc l i nac i óndel pl ano: θ=t g⁻¹ ( 0. 03) ;porl ot ant o P=1 00 0* 9. 8 * 2 0* c os [ t g⁻¹ ( 0. 03)+90° ]=1 9600* c os ( 91. 72° )=-587. 74wat t s Par ar educ i r l osahps ól ot i enesquet e nerencuent aque: 1hp≈7 45 . 7wa t t

1 . -el a gu afl uy ede s deu nr e ci p i e nt ear a zond e3 00 0k g / mi n,ha s t au nat u r bi n as i t u adaa1 2 m.s i el r endi mi ent odel at ur bi naesde80%,c al c ul es el apot enc i ades al i dadel at ur bi na. des pr ec i es el af r i c ci onenel t ubo. . . h=12 0m esl aal t ur ades deel " t anque "ol oqueseaes er ec i pi e nt equepr o ve eel agua.

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Laener gí apot enc i al del aguaenel r ec i pi ent ec onl ac aí das ec onv i er t eenener gí ac i nét i c aya Unlock full access with a free trial.

i mpac t arymo veral ast ur bi nasl asmi s masadq ui er enen er gí ac i nét i c ader ot ac i ón.


Es t aen er gí aesl ae ner gí adeent r adaal s i s t emaoener gí adel af uent e,l ac ual p er mi t eal a t ur bi nar eal i z arunt r abaj oqu eent r egaensuej eu nav ezdes c ont adasl aspér di dasdeener g El r endi mi ent o-quel l amar emosη( l et r agr i ega" et a" )-es t ádadopor : η=W( t ur b i n a)/E( f ue nt e )=Wt/Ef=Wt/Ep Si h a c e mo s :


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d ed o n de : Pt=ηPf=ηEp / t=ηm gh/t=η( m/ t )gh -------------------------------m/ t=g as t omá s i c oofl u j odema s a,e sunda t o=3 00 0k g / mi n Po ni e nd ot o da sl a sun i d ad ese nMKS: Pt=0 . 8×( 3 00 0k g / 6 0s )×1 20m ×9 . 8m/ s ² Pt=470 40W ========== e s ae sl ap ot e nc i ad es a l i d a,p er oa pa r e nt e me nt es ep i d ee nHPa s íq uec o ns i d er a nd oq ue : 1HP=745 . 7W s et i ene: Pt[ HP]=47040W /( 745. 7W/ HP)= 63HP You're Reading a Preview ================================

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q uee sl ap ot e nc i ad es al i d ae nHP .


2. -Lapr egun t aes t ámal f or mul adaper os eent i en de,deb i óser : <<¿ deq uéma gn i t u de sl af u er z ad ef r i c c i ó nq ue" s eop on e"a lmo v i mi e nt oae s ar a pi d ez ?>  Sign up to vote on thisv title p or q uel af u er z aob v i a me nt ea1 30k m/ hnoi mp i d ee lmo v i mi e n t o ( o nos emo e r í aa1 30k m Useful  p er os ís eo po nea lmi s moe qu l i b r an dol a sf u er z ass ob r e el a ut omó vi l . Not useful

P

tc i W/ t ta ba j/t i

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Fuerza de Arrastre

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( Fri gual enmódul oydi r ec c i ó n,per odesent i doo pues t oaF) p e r o W =Fdc os( á ng ul o F)=F r×d×c o s( á ng ul o Fr ) d on deFrt i e nes e nt i d oo pu es t oa lmo v i mi e nt o ,a síq uee lán gu l or e sp ec t od el d es pl a zami en t e s18 0ºyc o s 1 80 º=1 W =Fr×d×( 1)=-Fr×(v×t ) esel t r abaj oquer eal i z aenunc i er t ot i empol af uer z adef r i c ci ón. Depa s oh emo sr e emp l a z ad oe ld es p l a z ami e nt o' d ' p orl af ó r mu l adede s pl a z ami e nt oa v el oc i dadcons t ant e: d=vt Nosqueda: W =-F rvt Fi n a l me n t e ,c o mohe mo sd i c h oq ue You're Reading a Preview P=W/ tponemos:


P=-Frvt/t=-Frv


yd es p e j a mo s : Fr=P/ v ======= Pa s a n dov a l o r e saMKS:


 P=40HP=40×74 5. 7HP=2982 8W

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Fuerza de Arrastre

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T en emosl oss i g ui e nt e sd at o s: Vel oc i dadi ni c i al =Vo=0m/ s t i e mp o=1 2s a ce l e r a ci ó n=a=c on st a nt e VEl o c i d adfi na l=Vf=3 0m/ s Cons i d er amosuns i s t emal i br edef r i c i ones : As íhal l amosl aac el er ac i ón: a=( Vf-Vo) / t a=( 30-0) / 12 a=3 0/ 1 2=5/ 2m/ s ^ 2 Cal c ul andol adi s t anc i a: d=( Vf+Vo) * t / 2 d=( 30+0) * 12 / 2 d=3 6 0/ 2=1 8 0me t r o s Ent on ce st en emo squ ed et e r mi n arl apo t e nc i a : Po t e nc i a=TRa ba j o / t i e mp o TRa ba j o=Fu er z a*d i s t a nc i a

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Fu er z a=Ma sa * a c el er a ci ó n* c os ( x )


Porl omi s mo,l apo t enc i as er á:


P=Mas a* ac el er ac i ón* di s t anc i a* c os ( x ) / t i empo P=15 00 * 2 . 5 * 1 80 * c o s ( 1 5º ) / 1 2 P=7 80 * 5 * 1 5* c o s ( 1 5º ) P=5 65 06 06 60 84J / s ;c o n v e r t i re s t oaHPy ae smá ss i mp l e Sign up to vote on this title . . .

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Useful useful   e ls e gu nd o` p r o bl e mamet o ma r ámá st i e mp o,s i ns a brl a s c o n v e r s i o ne s .Not ELp r o c ed i mi e nt oe s

s i mi l ar ,des c omponei dnot r abaj oe nf uer z a.

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