[Vật lí 8] bài tập cơ

N

nhoxken_cucumber

Ta có:
PFe=PAl⇔dFeVFe=dAlVAl⇒VAlVFe=dFedAlP_{Fe}=P_{Al} \\ \Leftrightarrow d_{Fe}V_{Fe}=d_{Al}V_{Al} \\ \Rightarrow \frac{V_{Al}}{V_{Fe}} = \frac{d_{Fe}}{d_{Al}}
Mà dFe>dAld_{Fe}>d_{Al} \Rightarrow VAl>VFeV_{Al}>V_{Fe} \Rightarrow FAAl>FAFeF_{A_{Al}} > F_{A_{Fe}}
 
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