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$\sqrt{\frac{2h}{g}}+\frac{h}{v_{âm thanh}}=\Delta t$

${\overrightarrow{p}}_t={\overrightarrow{p}}_1+{\overrightarrow{p}}_2+......+{\overrightarrow{p}}_n$

$$\begin{gathered} x_1=x_2 \\ \Rightarrow x_1=x_2=\frac{d + a.v_2}{v_1+v_2}.v_1 \\ t=\frac{d + a.v_2}{v_1+v_2} \end{gathered}$$

$S_{(n-1)\to n}=v_{(n-1)}.1+\frac{1}{2}.a.1^2$

$$\begin{gathered} \epsilon =\frac{Q_2}{A}=\frac{Q_2}{Q_1-Q_2} \\ {\epsilon }_{max}=\frac{T_2}{T_1-T_2} \end{gathered}$$

$$\begin{gathered} H=\frac{A\text{'}}{Q_1}=\frac{Q_1-Q_2}{Q_1}.100\% \\ {H}_{max}=\frac{T_1-T_2}{T_1} \end{gathered}$$

$$\begin{gathered} ∆U=0 (Q=-A=A\text{'}, T=const) \\ ∆U=Q \left(A=0, V=const\right) \\ ∆U=Q-A\text{'} \left(p=const\right) \end{gathered}$$

$s_0=l{\alpha }_0=\sqrt{\frac{2W}{m{\omega }^2}}$

$$\begin{gathered} q{\text{'}}_1=q{\text{'}}_2=\frac{q_1+q_2}{2} \\ q{\text{'}}_1=q{\text{'}}_2=q{\text{'}}_3=\frac{q_1+q_2+q_3}{3} \end{gathered}$$

$P_x=\frac{U^2{R}_x}{{\left(R_x+R_N\right)}^2}$