$P = \frac{W}{t} / \cdot t$

$P \cdot t = \frac{W \cdot t}{t}$

$P \cdot t = W /: P$

$\frac{P \cdot t}{P} = \frac{W}{P}$

$t = \frac{W}{P}$

$E_{k} = \frac{m \cdot v ^{2}}{2} / \cdot 2$ $E_{k} = \frac{m \cdot v ^{2}}{2} / \cdot 2$

$2 \cdot E_{k} = \frac{2 \cdot m \cdot v ^{2}}{2}$

$2 \cdot E_{k} = m \cdot v^{2} /: m$

$\frac{2 \cdot E _{k}}{m} = \frac{m \cdot v ^{2}}{m}$

$v^{2} = \frac{2 \cdot E _{k}}{m} / \cdot$

$v = \frac{2 \cdot E _{k}}{m}$

$F_{1} \cdot r_{1} = F_{2} \cdot r_{2} /: F_{2}$

$\frac{F _{1} \cdot r _{1}}{F _{2}} = \frac{F _{2} \cdot r _{2}}{F _{2}}$

$r_{2} = \frac{F _{1} \cdot r _{1}}{F _{2}}$

$T = t + 273 / - 273$

$t = T - 273$

$Q = m \cdot c \cdot Δ t /: (m \cdot c)$

$\frac{Q}{m \cdot c} = \frac{m \cdot c \cdot Δ t}{m \cdot c}$

$Δ t = \frac{Q}{m \cdot c}$

$λ = \frac{v}{f} / \cdot f$

$λ \cdot f = \frac{v \cdot f}{f}$

$λ \cdot f = v /: λ$

$\frac{λ \cdot f}{λ} = \frac{v}{λ}$

$f = \frac{v}{λ}$

$R = R_{1} + R_{2} /- R_{2}$

$R_{1} = R - R_{2}$