Question

un recipient plin cu apa cantareste 2kg (ro apa=1000 kg/m cubi). cat cantareste acelasi recipient plin cu ulei(ro ulei=0,88 g\cm cubi)?dar daca se umple cu miere (ro miere=1422kg\m cubi)?
VA ROG REZOLVARE COMPLETA!!!!!!

Answer 1

V apa = V ulei
m apa/q·apa = m ulei/q ulei
2/1000 = m/880  m = 2·880/1000 = 1,76 kg
m miere = 2·1422/1000 = 2,844kg

Answer 2

$m_1=2 \ kg \\ \rho_1=1000 \ kg/m^3 \\ \rho_2=0,88 \ g/cm^3=880 \ kg/m^3 \\ \rho_3=1422 \ kg/m^3 \\ m_2-? \\ m_3-? \\ \ \ \ \ \ \bold{Rezolvare:} \\ \boxed{\rho= \frac{m}{V} } \\ \Rightarrow m_2= \rho_2 \cdot V , \ iar \ m_3=\rho_3 \cdot V \\ V= \frac{m_1}{\rho_1} \\ \Rightarrow V= \frac{2 \ kg}{1000 \ kg/m^3} \\ \bold{V=0,002 \ m^3} \\ \Rightarrow m_2=880 \ kg/m^3 \cdot 0,002 \ m^3 \\ \Rightarrow \boxed{m_2=1,76 \ kg}; \\ \Rightarrow m_3=1422 \ kg/m^3 \cdot 0,002 \ m^3 \\ \Rightarrow \boxed{m_3=2,844 \ m^3}.$