Bài 1:
a. \(p=dh=10300\cdot36=370800\left(N/m^2\right)\)
b. \(160cm^2=0,016m^2\)
\(p=\dfrac{F}{S}\Rightarrow F=S\cdot p=0,016\cdot370800=5932,8\left(N\right)\)
Bài 2:
Ta có: \(p_2>p_1\left(1165000>875000\right)\)
\(\Rightarrow\) Tàu đăng lặn xuống, vì khi càng xuống áp suất lại càng tăng.
\(\left\{{}\begin{matrix}p'=dh'\Rightarrow h'=\dfrac{p'}{d}=\dfrac{875000}{10300}\approx84,9\left(m\right)\\p''=dh''\Rightarrow h''=\dfrac{p''}{d}=\dfrac{1165000}{10300}\approx113\left(m\right)\end{matrix}\right.\)
Bài 3:
\(20cm=0,2m\)
\(p=dh=8000\cdot\left(1,8-0,2\right)=12800\left(N/m^2\right)\)
Bài 4:
\(p=dh=10000\cdot2,8=28000\left(N/m^2\right)\)
\(150cm^2=0,015m^2\)
\(p=\dfrac{F}{S}\Rightarrow F=S\cdot p=0,015\cdot28000=420\left(N\right)\)