Question

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Answer 1

Bài 1:

\(5cm^2=0,0005m^2\)

\(\Rightarrow p=\dfrac{F}{S}=\dfrac{500000}{\left(0,0005\cdot2\right)\cdot4}=125000000\left(Pa\right)\)

Bài 2:

\(250cm^2=0,025m^2\)

\(\Rightarrow p=\dfrac{F}{S}=\dfrac{400}{0,025}=16000\left(Pa\right)\)

Answer 2

Bài 3:

\(p=\dfrac{F}{S}\Rightarrow S=\dfrac{F}{p}=\dfrac{5\cdot10^4}{24000}\approx2,1m^3\)

Bài 4:

\(300cm^2=0,03m^2\)

\(p=\dfrac{F}{S}\Rightarrow F=S\cdot p=0,03\cdot1,7\cdot10^4=510\left(N\right)\)

Ta có: \(P=F=10m\Rightarrow m=\dfrac{510}{10}=51\left(kg\right)\)