Răspuns :

AlecsROid

Răspuns:

Explicație:

[tex]\frac{\rho_1}{\rho_2}=\frac{21}{7} =3 =>3\rho_2 = \rho1 \\\\\frac{m_1}{m_2} = 5 => 5m_2 = m_1\\ \rho_1 = \frac{m_1}{V_1}=> V_1 = \frac{m_1}{\rho_1} \\ \rho_2 = \frac{m_2}{V_2}=> V_2 = \frac{m_2}{\rho_2}\\\\\frac{V_1}{V_2} =\frac{\frac{m_1}{\rho_1}}{\frac{m_2}{\rho_2}} =\frac{m_1}{\rho_1}\cdot \frac{\rho_2}{m_2} =\frac{5m_2}{3\rho_2}\cdot \frac{\rho_2}{m_2}=\frac{5}{3}[/tex]

raportul maselor :)

Legislatieid

Răspuns: V₁ / V₂ = 5/3

Explicație:

stim raportul densitatilor = ρ ₁ / ρ ₂ = 21/7

raportul maselor = m₁ / m₂ = 15 / 3

se cere raportul volumelor  V₁ / V₂

densitatea = masa / volum

ρ = m / V

ρ₁ = m₁ / V₁

ρ ₂ = m₂ / V₂

ρ ₁ / ρ ₂ = (m₁ / V₁ )  / (m₂ / V₂ ) = m₁V₂ / m₂V₁  

21/7 = 15V₂ / 3V₁

3 = 5 V₂ / V₁

V1/V2 = 5/3

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