Question

Ex 21 , va rog!
Vr datele , formuele si apoi rezolvatea!
Dau coroana!

Answer 1

   
[tex]\displaystyle\\ 21)\\ \text{Daca balanta este la echilibru, atunci: }\\ m_1 = m_2\\ \text{Daca corpurile sunt din materiale diferite, atunci: }\\ \rho_1 \neq \rho_2\\ V_1 \neq V_2\\\\ \text{Relatia dintre masa, densitate si volum este: }\\\\ \rho = \frac{m}{V} ~~\Longrightarrow~~ m = \rho V~~\Longrightarrow~~V= \frac{m}{\rho}\\\\ [/tex]

[tex]\displaystyle\\ \text{Rezolvare:}\\\\ a)\\ V_1 \ \textgreater \ V_2~\text{daca}~\rho_1\ \textgreater \ \rho_2~\text{Fals, deoarece }\rho~si~V\text{ sunt invers proportionale}\\\\ b)\\ V_1\ \textless \ V_2~\text{daca}~\rho_1\ \textgreater \ \rho_2~\text{Adevarat }\\\\ c)\\ \rho_1V_1=\rho_2V_2~\text{Adevarat deoarece: }m_1= m_2~\text{si}~m = \rho V\\\\ d)\\ \frac{m_1}{V_1} \ \textgreater \ \frac{m_2}{V_2} ~\text{daca}~\rho_1 \ \textgreater \ \rho_2 ~\text{Adevarat deoarece }~\rho = \frac{m}{V}\\\\ e)\\ \frac{m_1}{V_1} \ \textless \ \frac{m_2}{V_2} ~\text{daca}~\rho_1 \ \textgreater \ \rho_2 ~\text{Fals }[/tex]