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Concursul de fizic i chimie pentru elevii din mediu ruralImpuls PerpetuumEtapa judeean 200

Clasa a !II "a

#$%E&'u(iectul ) * puncte

a) Imaginea obinut pe ecran nu poate fi dect real. n consecin lentila folosit este convergent.. ..2pb) desen corect....................................................................................................................... ..... ..... ..... ..3pc) scrierea corect a formulei punctelor conjugate..................................................................................3p scrierea corect a expresiei mririi liniare.............................................................................. ..... ..... ...3p determinarea expresiei literare a distanei focale..................................................................................2p calculul corect al distanei focale f+ ,-2 m.........................................................................................2pd) determinarea corecta a distantei obiect .+2,/m.................................................................................3p

'u(iect 2) puncte

a) reprezentarea corect a tuturor forelor...............................................................................................p

calculul forei de traciune! ( )

NFl

ghmmF ft 3"2

#=+

+= ..............................................................3p

rezultat corect! NFt 3"2= ...................................................................................................................p

b) calculul lucrului mecanic al forei de traciune! lFL tc = ...............................................................3p

rezultat corect! MjLc "2$3= .........................................................................................................p

c) calculul puterii utile! ( )gvmmPu += # ......................................................................................... ...3p

rezultat corect! kWPu %%= ...........................................................................................................p

calculul puterii consumate! vFP tc = .............................................................................................2p

rezultat corect! kWPc "2$3= ...............................................................................................................p'u(iectul 1) 20 puncte

reprezentarea corect a tuturor forelor....................................................................................................&pa) calculul tensiunii '! '( (* '( mg.............................................................................................&p

rezultat corect! '( +$" ,b) calculul tensiunii '2! '( '2cos - (* '2( ' cos -.........................................................................&p

rezultat corect! '2( +$/ ,

b) calculul alungirii!k

T

k

Fx e == ................................................................................................... ......&p

rezultat corect! x ( #$+" m

'u(iect / C - puncte& substane 0 punct..............................................................................................& puncte% ecuaii 0 punct..................................................................................................% puncte'ipul reaciilor .......................................................................................................% puncte1tarea de agregare.................................................................................................../ puncte

'u(iect 3 C....................................................................................................4 punctea. / ..................................... ......................................................& puncte

7/26/2019 7-barem1

2/2

Concursul de fizic i chimie pentru elevii din mediu ruralImpuls PerpetuumEtapa judeean 200

Clasa a !II "a

#$%E&

b. 3/$% g ,al.............................................................................$/ puncte ### g ap................................................................................../puncte