# Mechanics11/Seite14/Loesung.5.1

a) T= $\frac {5 *60}{13}s$ = 23s
f= $\frac {1}{T}$ = $\frac {1}{23}s$= 0,043Hz
ω = $\frac {2\pi}{T}$ = 2πf=0,272Hz
b) ω = $\frac {\Delta \varphi}{t}$
t = $\frac {\varphi}{\omega}$