Đáp án:
a.$3200\left( {Pa} \right)$
b. $2240\left( {Pa} \right)$
c. ${h_{n1}} = 0,32m$;${h_{n2}} = 0,334\left( m \right)$
Giải thích các bước giải:
tóm tắt
$\begin{array}{l}
{d_d} = 8000N/{m^3}\\
{h_1} = 40cm = 0,4m\\
{h_2} = (40-12)cm = 0,28m\\
{d_n} = 1000N/{m^3}
\end{array}$
Tính $\begin{array}{l}
a.{p_1}\\
b.{p_2}\\
c.{h_{n1}};{h_{n2}}
\end{array}$
$\begin{array}{l}
a.{p_1} = {d_d}.{h_1} = 8000.0,4 = 3200\left( {Pa} \right)\\
b.{p_2} = {d_d}.{h_2} = 8000.0,28 = 2240\left( {Pa} \right)
\end{array}$
$\begin{array}{l}
c.{p_1} = {p_n} \Rightarrow 3200 = {d_n}.{h_{n1}}\\
\Rightarrow 3200 = 10000.{h_{n1}}\\
\Rightarrow {h_{n1}} = 0,32m\\
{p_2} = {d_n}.\left( {{h_{n2}} - 0,12} \right)\\
\Rightarrow 2240 = 10000\left( {{h_{n2}} - 0,12} \right)\\
\Rightarrow {h_{n2}} = 0,334\left( m \right)
\end{array}$