vault backup: 2023-04-24 16:57:27

This commit is contained in:
Daniel Bulant 2023-04-24 16:57:27 +02:00
parent 10559c25da
commit 7fc5e76a63
3 changed files with 40 additions and 21 deletions

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View file

@ -1,6 +1,6 @@
# Vzorky # Vzorky
## Normalove napeti ## Normálové napětí
- tlak v pevnych latkach - tlak v pevných látkách
$\sigma_n=\frac{F_n}{S}$ $\sigma_n=\frac{F_n}{S}$
$[\sigma_n]=N*m^{-2}=Pa$ $[\sigma_n]=N*m^{-2}=Pa$
@ -12,13 +12,13 @@ $\frac{\Delta l}{l_0}=E\frac{F}{S}$
$\epsilon=\frac{\Delta l}{l_0}=E*\sigma_n$ $\epsilon=\frac{\Delta l}{l_0}=E*\sigma_n$
$\sigma_n=E*\epsilon$ $\sigma_n=E*\epsilon$
$E=$ modul pruznosti (jednotka $Pa$) $E=$ modul pružnosti (jednotka $Pa$)
--- ---
Krychle $a_0$ Krychle $a_0$
$V_0=a_0^3$ $V_0=a_0^3$
Zahreje se… Zahřeje se…
Krychle $a$ Krychle $a$
$V=a^3=[a_0(1+\alpha\Delta T)]^3$ $V=a^3=[a_0(1+\alpha\Delta T)]^3$
$a=a_0^3(1+\alpha\Delta T)^3$ $a=a_0^3(1+\alpha\Delta T)^3$
@ -31,11 +31,18 @@ $a=V_0(1+3\alpha\Delta T)$
--- ---
Zmena hustoty s teplotou? Změna hustoty s teplotou?
$\uparrow t\downarrow\rho$ (tabulka - hustota pri $20\degree C$) $\uparrow t\downarrow\rho$ (tabulka - hustota při $20\degree C$)
$\rho=\frac{m}V=\frac{m}{V_0(1+\beta\Delta T)}=\frac{\rho_0}{1+\beta\Delta T}$ $\rho=\frac{m}V=\frac{m}{V_0(1+\beta\Delta T)}=\frac{\rho_0}{1+\beta\Delta T}$
$\rho=\frac{\rho_0}{1\beta\Delta T}*\frac{1-\beta\Delta T}{1-\beta\Delta T}=\frac{\rho(1-\beta\Delta T)}{1-(\beta\Delta T)^2\rightarrow0}$ $\rho=\frac{\rho_0}{1\beta\Delta T}*\frac{1-\beta\Delta T}{1-\beta\Delta T}=\frac{\rho(1-\beta\Delta T)}{1-(\beta\Delta T)^2\rightarrow0}$
$\rho\dot=\rho_0(1-\beta\Delta T)$ $\rho\dot=\rho_0(1-\beta\Delta T)$
---
Změna skupenství
$Q=Q_1+L_t+Q_2$
$Q=mC_l(t_t-t_1)+ml_t+mC_v(t_2-t_t)$