Probleme fizica

#1
dana10101010

Posted 01 July 2016 - 18:46

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Înscris: 28.05.2014

Buna ziua,
Ma pregatesc pt un examen.
Cum pot rezolva problema din captura atasata?
multumesc.
ps: am refacut calculele si a rezultat 50kg*m/s

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Edited by dana10101010, 01 July 2016 - 18:50.

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#2
f300

Posted 01 July 2016 - 19:00

30k si ma duc

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Posts: 30,000
Înscris: 27.09.2008

Nu e si vreo diagrama cu directia fortei fata de viteza? La ce date sint raspunsul poate sa fie oricit intre 10 si 50 kg*m/s, in functie de directie.

Nota: vedeti ca gresesc des la calcule :-)

Edited by f300, 01 July 2016 - 19:01.

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#3
pasilla

Posted 01 July 2016 - 19:02

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Nici eu nu inteleg cum se apica forta aia.

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#4
f300

Posted 01 July 2016 - 19:07

30k si ma duc

Grup: Senior Members
Posts: 30,000
Înscris: 27.09.2008

Poate aia care au dat problema nu ca gindeau in plan, nici macar unidimensional ci gindeau semi-unidimensional :-)

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#5
pufonel

Posted 02 July 2016 - 01:10

Oglinda, oglinjoara, cine-i cel mai pufos din tara?

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Posts: 27,867
Înscris: 28.11.2006

Probabil se presupune ca forta actioneaza in sensul vitezei initiale a corpului. Daca ar fi in sens invers, impulsul final ar fi 10 kg*m/s, ceea ce nu apare in optiuni.

Deci:
Viteza initiala este 10 m/s (din formula Ec)
Impulsul initial este de 20 kg*m/s.
Din teorema variatiei impulsului: dp=F*dt (e corect in cazul asta si cu delta in loc de d), rezulta ca impulsul creste cu 30 kg*m/s.
Impulsul final va fi de 50 gk*m/s.

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#6
f300

Posted 02 July 2016 - 07:01

30k si ma duc

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Posts: 30,000
Înscris: 27.09.2008

pufonel, on 02 iulie 2016 - 01:10, said:

Probabil se presupune ca forta actioneaza in sensul vitezei initiale a corpului. Daca ar fi in sens invers, impulsul final ar fi 10 kg*m/s, ceea ce nu apare in optiuni.

Si tocmai am spus de gindire unidirectionala!

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#7
dana10101010

Posted 04 July 2016 - 20:09

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Buna ziua,
Cum se poate rezolva urmatoarele?
Multumesc.

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#8
dana10101010

Posted 09 July 2016 - 22:36

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Multumesc pt. raspunsurile anterioare.
Cum se pot rezolva problemele urmatoare?

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Edited by dana10101010, 09 July 2016 - 22:48.

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Anunturi

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Probleme fizica

#1 dana10101010 Posted 01 July 2016 - 18:46

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#2 f300 Posted 01 July 2016 - 19:00

#3 pasilla Posted 01 July 2016 - 19:02

#4 f300 Posted 01 July 2016 - 19:07

#5 pufonel Posted 02 July 2016 - 01:10

#6 f300 Posted 02 July 2016 - 07:01

#7 dana10101010 Posted 04 July 2016 - 20:09

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#8 dana10101010 Posted 09 July 2016 - 22:36

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#1
dana10101010

Posted 01 July 2016 - 18:46

#2
f300

Posted 01 July 2016 - 19:00

#3
pasilla

Posted 01 July 2016 - 19:02

#4
f300

Posted 01 July 2016 - 19:07

#5
pufonel

Posted 02 July 2016 - 01:10

#6
f300

Posted 02 July 2016 - 07:01

#7
dana10101010

Posted 04 July 2016 - 20:09

#8
dana10101010

Posted 09 July 2016 - 22:36