Recapitulare – [40]
Contine intrebari- problema din lectiile: Lucrul mecanic, Puterea mecanica si Energia mecanica
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Question 1 of 10
1. Question
1 pointsUn corp de masa 10kg este aruncat vertical in sus, in campul gravitational al Pamantului, cu 10m/s. Valoarea maxima a energiei potentiale este:Correct
Incorrect
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Question 2 of 10
2. Question
1 pointsIn cazul aruncarii unui corp in sus:Correct
Incorrect
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Question 3 of 10
3. Question
1 pointsUn corp este ridicat cu viteza constanta de a lungul unui plan inclinat care formeaza cu orizontala unghiul alfa, pentru care tangenta acestuia este 1,8. Randamentul planului inclinat are valoarea de 0,8. Coeficientul de frecare dintre corp si plan este:Correct
Incorrect
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Question 4 of 10
4. Question
1 pointsO macara ridica vertical un corp cu masa de 50 kg, cu viteza constanta de 1m/s. Puterea dezvoltata de macara este:Correct
Incorrect
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Question 5 of 10
5. Question
1 pointsUnitatea de masura pentru puterea mecanica in Sistemul International de Unitati:Correct
Incorrect
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Question 6 of 10
6. Question
1 pointsMotorul unui automobil dezvolta o putere constanta. Cand viteza automobilului creste, ce se intampla cu forta de tractiune a motorului?Correct
Incorrect
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Question 7 of 10
7. Question
1 pointsUn corp este lansat vertical in sus, cu viteza initiala de 3m/s, in campul gravitational terestru, de la nivelul la care energia potentiala este nula. Calculati, inaltimea h la care energia sa cinetica este jumatate din energia sa potentiala.Correct
Incorrect
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Question 8 of 10
8. Question
1 pointsUn mar cu masa 200 g cade de pe ramura unui pom. Imediat inaintea contactului cu solul, produsul dintre masa marului si viteza acestuia este de 2kg m/s. In acelasi moment, energia cinetica a marului este:Correct
Incorrect
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Question 9 of 10
9. Question
1 pointsUn om deplaseza cu viteza constanta pe o suprafata orizontala o lada cu masa de 100kg. Coeficientul de frecare dintre lada si suprafata pe care se deplaseaza este 0,5 si deplasarea de 800 cm. Lucrul mecanic efectuat de forta de frecare:Correct
Incorrect
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Question 10 of 10
10. Question
1 pointsDin varful unui plan inclinat de inaltime 2m aluneca cu frecare un corp cu masa de 2kg. Lucrul mecanic efectuat de greutatea corpului pana in momentul opririi in lungul planului orizontal:Correct
Incorrect
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Examples of questions from "Recapitulare – [40]"
- Motorul unui automobil dezvolta o putere constanta. Cand viteza automobilului creste, ce se intampla cu forta de tractiune a motorului?
- O macara ridica vertical un corp cu masa de 50 kg, cu viteza constanta de 1m/s. Puterea dezvoltata de macara este:
- Un corp de masa 10kg este aruncat vertical in sus, in campul gravitational al Pamantului, cu 10m/s. Valoarea maxima a energiei potentiale este:
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