## Essential University Physics: Volume 1 (3rd Edition)

a) We find: $\omega = \frac{2\pi}{T}=\frac{2\pi}{\frac{18.7}{38}}=12.8 \ rads/s$ b) We use the equation for wave number to find: $k=\frac{2\pi}{\lambda}=\frac{2\pi}{18}=.336$ c) Combining these values and the amplitude of the wave, which is 2.34, we find: $x(t)=2.34cos(.336x+12.8t)$